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class="toc"><li><span class="item-toggle-none"></span><a href="#sec-organization-of-this-specification" title="Organization of This Specification"><span class="secnum">4.5</span> Organization of This Specification</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-data-types-and-values" title="ECMAScript Data Types and Values"><span class="secnum">6</span> ECMAScript Data Types and Values</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-types" title="ECMAScript Language Types"><span class="secnum">6.1</span> ECMAScript Language Types</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-types-symbol-type" title="The Symbol Type"><span class="secnum">6.1.5</span> The Symbol Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-well-known-symbols" title="Well-Known Symbols"><span class="secnum">6.1.5.1</span> Well-Known Symbols</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-object-internal-methods-and-internal-slots" title="Object Internal Methods and Internal Slots"><span class="secnum">6.1.7</span> Object Internal Methods and Internal Slots</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations" title="Abstract Operations"><span class="secnum">7</span> Abstract Operations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-operations-on-objects" title="Operations on Objects"><span class="secnum">7.3</span> Operations on Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-initializeinstance" title="InitializeInstanceElements ( O, constructor )"><span class="secnum">7.3.34</span> InitializeInstanceElements ( <var>O</var>, <var>constructor</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations" title="Syntax-Directed Operations"><span class="secnum">8</span> Syntax-Directed Operations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations-scope-analysis" title="Scope Analysis"><span class="secnum">8.2</span> Scope Analysis</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-boundnames" title="Static Semantics: BoundNames"><span class="secnum">8.2.1</span> SS: BoundNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-declarationpart" title="Static Semantics: DeclarationPart"><span class="secnum">8.2.2</span> SS: DeclarationPart</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-isconstantdeclaration" title="Static Semantics: IsConstantDeclaration"><span class="secnum">8.2.3</span> SS: IsConstantDeclaration</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-lexicallydeclarednames" title="Static Semantics: LexicallyDeclaredNames"><span class="secnum">8.2.4</span> SS: LexicallyDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-lexicallyscopeddeclarations" title="Static Semantics: LexicallyScopedDeclarations"><span class="secnum">8.2.5</span> SS: LexicallyScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-vardeclarednames" title="Static Semantics: VarDeclaredNames"><span class="secnum">8.2.6</span> SS: VarDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-varscopeddeclarations" title="Static Semantics: VarScopedDeclarations"><span class="secnum">8.2.7</span> SS: VarScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevellexicallydeclarednames" title="Static Semantics: TopLevelLexicallyDeclaredNames"><span class="secnum">8.2.8</span> SS: TopLevelLexicallyDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevellexicallyscopeddeclarations" title="Static Semantics: TopLevelLexicallyScopedDeclarations"><span class="secnum">8.2.9</span> SS: TopLevelLexicallyScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevelvardeclarednames" title="Static Semantics: TopLevelVarDeclaredNames"><span class="secnum">8.2.10</span> SS: TopLevelVarDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevelvarscopeddeclarations" title="Static Semantics: TopLevelVarScopedDeclarations"><span class="secnum">8.2.11</span> SS: TopLevelVarScopedDeclarations</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations-miscellaneous" title="Miscellaneous"><span class="secnum">8.6</span> Miscellaneous</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-bindinginitialization" title="Runtime Semantics: BindingInitialization"><span class="secnum">8.6.2</span> RS: BindingInitialization</a></li><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-iteratorbindinginitialization" title="Runtime Semantics: IteratorBindingInitialization"><span class="secnum">8.6.3</span> RS: IteratorBindingInitialization</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-executable-code-and-execution-contexts" title="Executable Code and Execution Contexts"><span class="secnum">9</span> Executable Code and Execution Contexts</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-weakly-hold-targets-processing-model" title="Processing Model of WeakRef and FinalizationRegistryweakly hold Targets"><span class="secnum">9.10</span> Processing Model of <del>WeakRef and FinalizationRegistry</del><ins>weakly hold</ins> Targets</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakly-hold-execution" title="Execution"><span class="secnum">9.10.3</span> Execution</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-lexical-grammar" title="ECMAScript Language: Lexical Grammar"><span class="secnum">12</span> ECMAScript Language: Lexical Grammar</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-automatic-semicolon-insertion" title="Automatic Semicolon Insertion"><span class="secnum">12.10</span> Automatic Semicolon Insertion</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-rules-of-automatic-semicolon-insertion" title="Rules of Automatic Semicolon Insertion"><span class="secnum">12.10.1</span> Rules of Automatic Semicolon Insertion</a></li><li><span class="item-toggle">+</span><a href="#sec-interesting-cases-of-automatic-semicolon-insertion" title="Interesting Cases of Automatic Semicolon Insertion"><span class="secnum">12.10.3</span> Interesting Cases of Automatic Semicolon Insertion</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-asi-cases-with-no-lineterminator-here" title="Cases of Automatic Semicolon Insertion and “[no LineTerminator here]”"><span class="secnum">12.10.3.2</span> Cases of Automatic Semicolon Insertion and “[no <emu-nt>LineTerminator</emu-nt> here]”</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-no-lineterminator-here-automatic-semicolon-insertion-list" title="List of Grammar Productions with Optional Operands and “[no LineTerminator here]”"><span class="secnum">12.10.3.2.1</span> List of Grammar Productions with Optional Operands and “[no <emu-nt>LineTerminator</emu-nt> here]”</a></li></ol></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-expressions" title="ECMAScript Language: Expressions"><span class="secnum">13</span> ECMAScript Language: Expressions</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-primary-expression" title="Primary Expression"><span class="secnum">13.2</span> Primary Expression</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-primary-expression-regular-expression-literals" title="Regular Expression Literals"><span class="secnum">13.2.7</span> Regular Expression Literals</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-primary-expression-regular-expression-literals-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.2.7.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-isvalidregularexpressionliteral" title="Static Semantics: IsValidRegularExpressionLiteral ( literal, canCreateBinding )"><span class="secnum">13.2.7.2</span> SS: IsValidRegularExpressionLiteral ( <var>literal</var>, <ins><var>canCreateBinding</var></ins> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-primary-expression-match-expression" title="Match Expression"><span class="secnum">13.2.10</span> Match Expression</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-relational-operators" title="Relational Operators"><span class="secnum">13.10</span> Relational Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-relational-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.10.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-statements-and-declarations" title="ECMAScript Language: Statements and Declarations"><span class="secnum">14</span> ECMAScript Language: Statements and Declarations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-iteration-statements" title="Iteration Statements"><span class="secnum">14.7</span> Iteration Statements</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-for-in-and-for-of-statements" title="The for-in, for-of, and for-await-of Statements"><span class="secnum">14.7.1</span> The <code>for</code>-<code>in</code>, <code>for</code>-<code>of</code>, and <code>for</code>-<code>await</code>-<code>of</code> Statements</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-try-statement" title="The try Statement"><span class="secnum">14.14</span> The <code>try</code> Statement</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-functions-and-classes" title="ECMAScript Language: Functions and Classes"><span class="secnum">15</span> ECMAScript Language: Functions and Classes</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-class-definitions" title="Class Definitions"><span class="secnum">15.7</span> Class Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-classdefinitionevaluation" title="Runtime Semantics: ClassDefinitionEvaluation"><span class="secnum">15.7.14</span> RS: ClassDefinitionEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-tail-position-calls" title="Tail Position Calls"><span class="secnum">15.10</span> Tail Position Calls</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-hascallintailposition" title="Static Semantics: HasCallInTailPosition"><span class="secnum">15.10.2</span> SS: HasCallInTailPosition</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-fundamental-objects" title="Fundamental Objects"><span class="secnum">20</span> Fundamental Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-object-objects" title="Object Objects"><span class="secnum">20.1</span> Object Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-object-constructor" title="Properties of the Object Constructor"><span class="secnum">20.1.2</span> Properties of the Object Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-object-@@custommatcher" title="Object [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.1.2.24</span> Object [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-function-objects" title="Function Objects"><span class="secnum">20.2</span> Function Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-function-constructor" title="Properties of the Function Constructor"><span class="secnum">20.2.2</span> Properties of the Function Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function-@@custommatcher" title="Function [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.2.2.2</span> Function [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-function-prototype-object" title="Properties of the Function Prototype Object"><span class="secnum">20.2.3</span> Properties of the Function Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function.prototype-@@custommatcher" title="Function.prototype [ @@customMatcher ] ( subject, hint, receiver )"><span class="secnum">20.2.3.7</span> Function.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var>, <var>receiver</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-boolean-objects" title="Boolean Objects"><span class="secnum">20.3</span> Boolean Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-boolean-constructor" title="Properties of the Boolean Constructor"><span class="secnum">20.3.2</span> Properties of the Boolean Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-boolean-@@custommatcher" title="Boolean [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.3.2.2</span> Boolean [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-symbol-objects" title="Symbol Objects"><span class="secnum">20.4</span> Symbol Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-symbol-constructor" title="Properties of the Symbol Constructor"><span class="secnum">20.4.2</span> Properties of the Symbol Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-symbol.custommatcher" title="Symbol.customMatcher"><span class="secnum">20.4.2.17</span> Symbol.customMatcher</a></li><li><span class="item-toggle-none"></span><a href="#sec-symbol-@@custommatcher" title="Symbol [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.4.2.18</span> Symbol [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-error-objects" title="Error Objects"><span class="secnum">20.5</span> Error Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-error-constructor" title="The Error Constructor"><span class="secnum">20.5.1</span> The Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-error-message" title="Error ( message [ , options ] )"><span class="secnum">20.5.1.1</span> Error ( <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-error-constructors" title="Properties of the Error Constructor"><span class="secnum">20.5.2</span> Properties of the Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-error-@@custommatcher" title="Error [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.5.2.2</span> Error [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-error-instances" title="Properties of Error Instances"><span class="secnum">20.5.4</span> Properties of Error Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-nativeerror-object-structure" title="NativeError Object Structure"><span class="secnum">20.5.6</span> <var>NativeError</var> Object Structure</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-nativeerror-constructors" title="The NativeError Constructors"><span class="secnum">20.5.6.1</span> The <var>NativeError</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-nativeerror" title="NativeError ( message [ , options ] )"><span class="secnum">20.5.6.1.1</span> <var>NativeError</var> ( <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-nativeerror-constructors" title="Properties of the NativeError Constructors"><span class="secnum">20.5.6.2</span> Properties of the <var>NativeError</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-nativeerror-@@custommatcher" title="NativeError [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.5.6.2.2</span> <var>NativeError</var> [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-nativeerror-instances" title="Properties of NativeError Instances"><span class="secnum">20.5.6.4</span> Properties of <var>NativeError</var> Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-aggregate-error-objects" title="AggregateError Objects"><span class="secnum">20.5.7</span> AggregateError Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-aggregate-error-constructor" title="The AggregateError Constructor"><span class="secnum">20.5.7.1</span> The AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-aggregate-error" title="AggregateError ( errors, message [ , options ] )"><span class="secnum">20.5.7.1.1</span> AggregateError ( <var>errors</var>, <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-aggregate-error-constructors" title="Properties of the AggregateError Constructor"><span class="secnum">20.5.7.2</span> Properties of the AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-aggregate-error-@@custommatcher" title="AggregateError [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.5.7.2.2</span> AggregateError [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-aggregate-error-instances" title="Properties of AggregateError Instances"><span class="secnum">20.5.7.4</span> Properties of AggregateError Instances</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-numbers-and-dates" title="Numbers and Dates"><span class="secnum">21</span> Numbers and Dates</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-number-objects" title="Number Objects"><span class="secnum">21.1</span> Number Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-number-constructor" title="Properties of the Number Constructor"><span class="secnum">21.1.2</span> Properties of the Number Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-number-@@custommatcher" title="Number [ @@customMatcher ] ( subject, hint )"><span class="secnum">21.1.2.16</span> Number [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-bigint-objects" title="BigInt Objects"><span class="secnum">21.2</span> BigInt Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-bigint-constructor" title="Properties of the BigInt Constructor"><span class="secnum">21.2.2</span> Properties of the BigInt Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-bigint-@@custommatcher" title="BigInt [ @@customMatcher ] ( subject, hint )"><span class="secnum">21.2.2.4</span> BigInt [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-date-objects" title="Date Objects"><span class="secnum">21.4</span> Date Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-date-constructor" title="Properties of the Date Constructor"><span class="secnum">21.4.3</span> Properties of the Date Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-date-@@custommatcher" title="Date [ @@customMatcher ] ( subject, hint )"><span class="secnum">21.4.3.5</span> Date [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-text-processing" title="Text Processing"><span class="secnum">22</span> Text Processing</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-string-objects" title="String Objects"><span class="secnum">22.1</span> String Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-string-constructor" title="Properties of the String Constructor"><span class="secnum">22.1.2</span> Properties of the String Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-string-@@custommatcher" title="String [ @@customMatcher ] ( subject, hint )"><span class="secnum">22.1.2.5</span> String [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-regexp-regular-expression-objects" title="RegExp (Regular Expression) Objects"><span class="secnum">22.2</span> RegExp (Regular Expression) Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-patterns" title="Patterns"><span class="secnum">22.2.1</span> Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-patterns-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">22.2.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-capturinggroupname" title="Static Semantics: CapturingGroupName"><span class="secnum">22.2.1.9</span> SS: CapturingGroupName</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations-for-regexp-creation" title="Abstract Operations for RegExp Creation"><span class="secnum">22.2.3</span> Abstract Operations for RegExp Creation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexpcreate" title="RegExpCreate ( P, F )"><span class="secnum">22.2.3.1</span> RegExpCreate ( <var>P</var>, <var>F</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-regexpinitialize" title="RegExpInitialize ( obj, pattern, flags, canCreateBinding )"><span class="secnum">22.2.3.3</span> RegExpInitialize ( <var>obj</var>, <var>pattern</var>, <var>flags</var>, <ins><var>canCreateBinding</var></ins> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-parsepattern" title="Static Semantics: ParsePattern ( patternText, u, v, canCreateBinding )"><span class="secnum">22.2.3.4</span> SS: ParsePattern ( <var>patternText</var>, <var>u</var>, <var>v</var>, <ins><var>canCreateBinding</var></ins> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-regexp-constructor" title="The RegExp Constructor"><span class="secnum">22.2.4</span> The RegExp Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp-pattern-flags" title="RegExp ( pattern, flags )"><span class="secnum">22.2.4.1</span> RegExp ( <var>pattern</var>, <var>flags</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-regexp-constructor" title="Properties of the RegExp Constructor"><span class="secnum">22.2.5</span> Properties of the RegExp Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp-@@custommatcher" title="RegExp [ @@customMatcher ] ( subject, hint )"><span class="secnum">22.2.5.3</span> RegExp [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-regexp-prototype-object" title="Properties of the RegExp Prototype Object"><span class="secnum">22.2.6</span> Properties of the RegExp Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp.prototype-@@custommatcher" title="RegExp.prototype [ @@customMatcher ] ( subject, hint )"><span class="secnum">22.2.6.20</span> RegExp.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-indexed-collections" title="Indexed Collections"><span class="secnum">23</span> Indexed Collections</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-array-objects" title="Array Objects"><span class="secnum">23.1</span> Array Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-array-constructor" title="Properties of the Array Constructor"><span class="secnum">23.1.2</span> Properties of the Array Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-array-@@custommatcher" title="Array [ @@customMatcher ] ( subject, hint )"><span class="secnum">23.1.2.6</span> Array [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-typedarray-objects" title="TypedArray Objects"><span class="secnum">23.2</span> TypedArray Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-typedarray-constructors" title="Properties of the TypedArray Constructors"><span class="secnum">23.2.6</span> Properties of the <var>TypedArray</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-_typedarray_-@@custommatcher" title="TypedArray [ @@customMatcher ] ( subject, hint )"><span class="secnum">23.2.6.3</span> <var>TypedArray</var> [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-keyed-collections" title="Keyed Collections"><span class="secnum">24</span> Keyed Collections</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-map-objects" title="Map Objects"><span class="secnum">24.1</span> Map Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-map-constructor" title="Properties of the Map Constructor"><span class="secnum">24.1.2</span> Properties of the Map Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-map-@@custommatcher" title="Map [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.1.2.3</span> Map [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-set-objects" title="Set Objects"><span class="secnum">24.2</span> Set Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-set-constructor" title="Properties of the Set Constructor"><span class="secnum">24.2.2</span> Properties of the Set Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-set-@@custommatcher" title="Set [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.2.2.3</span> Set [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-weakmap-objects" title="WeakMap Objects"><span class="secnum">24.3</span> WeakMap Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weakmap-constructor" title="Properties of the WeakMap Constructor"><span class="secnum">24.3.2</span> Properties of the WeakMap Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakmap-@@custommatcher" title="WeakMap [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.3.2.2</span> WeakMap [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-weakset-objects" title="WeakSet Objects"><span class="secnum">24.4</span> WeakSet Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weakset-constructor" title="Properties of the WeakSet Constructor"><span class="secnum">24.4.2</span> Properties of the WeakSet Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakset-@@custommatcher" title="WeakSet [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.4.2.2</span> WeakSet [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-structured-data" title="Structured Data"><span class="secnum">25</span> Structured Data</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-arraybuffer-objects" title="ArrayBuffer Objects"><span class="secnum">25.1</span> ArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-arraybuffer-constructor" title="Properties of the ArrayBuffer Constructor"><span class="secnum">25.1.5</span> Properties of the ArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-arraybuffer-@@custommatcher" title="ArrayBuffer [ @@customMatcher ] ( subject, hint )"><span class="secnum">25.1.5.4</span> ArrayBuffer [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-sharedarraybuffer-objects" title="SharedArrayBuffer Objects"><span class="secnum">25.2</span> SharedArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-sharedarraybuffer-constructor" title="Properties of the SharedArrayBuffer Constructor"><span class="secnum">25.2.4</span> Properties of the SharedArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-sharedarraybuffer-@@custommatcher" title="SharedArrayBuffer [ @@customMatcher ] ( subject, hint )"><span class="secnum">25.2.4.3</span> SharedArrayBuffer [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-dataview-objects" title="DataView Objects"><span class="secnum">25.3</span> DataView Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-dataview-constructor" title="Properties of the DataView Constructor"><span class="secnum">25.3.3</span> Properties of the DataView Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-dataview-@@custommatcher" title="DataView [ @@customMatcher ] ( subject, hint )"><span class="secnum">25.3.3.2</span> DataView [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-managing-memory" title="Managing Memory"><span class="secnum">26</span> Managing Memory</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-weak-ref-objects" title="WeakRef Objects"><span class="secnum">26.1</span> WeakRef Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weak-ref-constructor" title="Properties of the WeakRef Constructor"><span class="secnum">26.1.2</span> Properties of the WeakRef Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakref-@@custommatcher" title="WeakRef [ @@customMatcher ] ( subject, hint )"><span class="secnum">26.1.2.2</span> WeakRef [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-finalization-registry-objects" title="FinalizationRegistry Objects"><span class="secnum">26.2</span> FinalizationRegistry Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-finalization-registry-constructor" title="Properties of the FinalizationRegistry Constructor"><span class="secnum">26.2.2</span> Properties of the FinalizationRegistry Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-finalizationregistry-@@custommatcher" title="FinalizationRegistry [ @@customMatcher ] ( subject, hint )"><span class="secnum">26.2.2.2</span> FinalizationRegistry [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-control-abstraction-objects" title="Control Abstraction Objects"><span class="secnum">27</span> Control Abstraction Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-promise-objects" title="Promise Objects"><span class="secnum">27.2</span> Promise Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-promise-constructor" title="Properties of the Promise Constructor"><span class="secnum">27.2.4</span> Properties of the Promise Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-promise-@@custommatcher" title="Promise [ @@customMatcher ] ( subject, hint )"><span class="secnum">27.2.4.9</span> Promise [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-reflection" title="Reflection"><span class="secnum">28</span> Reflection</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-proxy-objects" title="Proxy Objects"><span class="secnum">28.2</span> Proxy Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-proxy-constructor" title="The Proxy Constructor"><span class="secnum">28.2.1</span> The Proxy Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-proxy-@@custommatcher" title="Proxy [ @@customMatcher ] ( )"><span class="secnum">28.2.1.2</span> Proxy [ @@customMatcher ] ( )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-pattern-matching" title="Pattern Matching"><span class="secnum">30</span> <ins>Pattern Matching</ins></a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-match-patterns" title="Match Patterns"><span class="secnum">30.1</span> Match Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-match-patterns-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">30.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-is-optional-pattern" title="Static Semantics: IsOptionalPattern"><span class="secnum">30.1.2</span> SS: IsOptionalPattern</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-pattern-matches" title="Runtime Semantics: MatchPatternMatches"><span class="secnum">30.1.3</span> RS: MatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-primitive-pattern-matches" title="Runtime Semantics: PrimitivePatternMatches"><span class="secnum">30.1.4</span> RS: PrimitivePatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-binding-pattern-matches" title="Runtime Semantics: BindingPatternMatches"><span class="secnum">30.1.5</span> RS: BindingPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-regular-expression-pattern-matches" title="Runtime Semantics: RegularExpressionPatternMatches"><span class="secnum">30.1.6</span> RS: RegularExpressionPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-member-expression-pattern-matches" title="Runtime Semantics: MemberExpressionPatternMatches"><span class="secnum">30.1.7</span> RS: MemberExpressionPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-object-pattern-matches" title="Runtime Semantics: ObjectPatternMatches"><span class="secnum">30.1.8</span> RS: ObjectPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-object-pattern-inner-matches" title="Runtime Semantics: ObjectPatternInnerMatches"><span class="secnum">30.1.9</span> RS: ObjectPatternInnerMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-array-pattern-matches" title="Runtime Semantics: ArrayPatternMatches"><span class="secnum">30.1.10</span> RS: ArrayPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-list-pattern-matches" title="Runtime Semantics: ListPatternMatches"><span class="secnum">30.1.11</span> RS: ListPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-list-pattern-inner-matches" title="Runtime Semantics: ListPatternInnerMatches"><span class="secnum">30.1.12</span> RS: ListPatternInnerMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-unary-algebraic-pattern-matches" title="Runtime Semantics: UnaryAlgebraicPatternMatches"><span class="secnum">30.1.13</span> RS: UnaryAlgebraicPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-relational-pattern-matches" title="Runtime Semantics: RelationalPatternMatches"><span class="secnum">30.1.14</span> RS: RelationalPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-if-pattern-matches" title="Runtime Semantics: IfPatternMatches"><span class="secnum">30.1.15</span> RS: IfPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-combined-match-pattern-matches" title="Runtime Semantics: CombinedMatchPatternMatches"><span class="secnum">30.1.16</span> RS: CombinedMatchPatternMatches</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-match-expression" title="The match Expression"><span class="secnum">30.2</span> The <code>match</code> Expression</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-match-expression-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">30.2.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">30.2.2</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-clauses-runtime-semantics-evaluation" title="Runtime Semantics: MatchExpressionClausesEvaluation"><span class="secnum">30.2.3</span> RS: MatchExpressionClausesEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-clause-runtime-semantics-evaluation" title="Runtime Semantics: MatchExpressionClauseEvaluation"><span class="secnum">30.2.4</span> RS: MatchExpressionClauseEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations-for-pattern-matching" title="Abstract Operations for Pattern Matching"><span class="secnum">30.3</span> Abstract Operations for Pattern Matching</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-invoke-custom-matcher" title="InvokeCustomMatcher ( matcher, subject, cacheGroup, kind, receiver )"><span class="secnum">30.3.1</span> InvokeCustomMatcher ( <var>matcher</var>, <var>subject</var>, <var>cacheGroup</var>, <var>kind</var>, <var>receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-validatecustommatcherhint" title="ValidateCustomMatcherHint ( hint [ , kind ] )"><span class="secnum">30.3.2</span> ValidateCustomMatcherHint ( <var>hint</var> [ , <var>kind</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-creatematchcache" title="CreateMatchCache ( )"><span class="secnum">30.3.3</span> CreateMatchCache ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-match-cache" title="GetMatchCache ( subject, cacheGroup )"><span class="secnum">30.3.4</span> GetMatchCache ( <var>subject</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-has-property-cached" title="HasPropertyCached ( subject, cacheGroup, propertyName )"><span class="secnum">30.3.5</span> HasPropertyCached ( <var>subject</var>, <var>cacheGroup</var>, <var>propertyName</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-cached" title="GetCached ( subject, cacheGroup, propertyName )"><span class="secnum">30.3.6</span> GetCached ( <var>subject</var>, <var>cacheGroup</var>, <var>propertyName</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-iterator-cached" title="GetIteratorCached ( subject, cacheGroup )"><span class="secnum">30.3.7</span> GetIteratorCached ( <var>subject</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-iterator-step-cached" title="IteratorStepCached ( iterator, cacheGroup )"><span class="secnum">30.3.8</span> IteratorStepCached ( <var>iterator</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-iterator-nth-value-cached" title="GetIteratorNthValueCached ( iterator, cacheGroup, n )"><span class="secnum">30.3.9</span> GetIteratorNthValueCached ( <var>iterator</var>, <var>cacheGroup</var>, <var>n</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-finish-list-match" title="FinishListMatch ( iterator, cacheGroup, expectedLength )"><span class="secnum">30.3.10</span> FinishListMatch ( <var>iterator</var>, <var>cacheGroup</var>, <var>expectedLength</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-finish-match" title="FinishMatch ( matchCompletion, cacheGroup )"><span class="secnum">30.3.11</span> FinishMatch ( <var>matchCompletion</var>, <var>cacheGroup</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-grammar-summary" title="Grammar Summary"><span class="secnum">A</span> Grammar Summary</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-expressions" title="Expressions"><span class="secnum">A.1</span> Expressions</a></li><li><span class="item-toggle-none"></span><a href="#sec-annex-match-patterns" title="Patterns"><span class="secnum">A.9</span> Patterns</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-additional-ecmascript-features-for-web-browsers" title="Additional ECMAScript Features for Web Browsers"><span class="secnum">B</span> Additional ECMAScript Features for Web Browsers</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-additional-syntax" title="Additional Syntax"><span class="secnum">B.1</span> Additional Syntax</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-regular-expressions-patterns" title="Regular Expressions Patterns"><span class="secnum">B.1.2</span> Regular Expressions Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-parsepattern-annexb" title="Static Semantics: ParsePattern ( patternText, u, v, canCreateBinding )"><span class="secnum">B.1.2.9</span> SS: ParsePattern ( <var>patternText</var>, <var>u</var>, <var>v</var><ins>, <var>canCreateBinding</var></ins> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-additional-built-in-properties" title="Additional Built-in Properties"><span class="secnum">B.2</span> Additional Built-in Properties</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-additional-properties-of-the-regexp.prototype-object" title="Additional Properties of the RegExp.prototype Object"><span class="secnum">B.2.4</span> Additional Properties of the RegExp.prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp.prototype.compile" title="RegExp.prototype.compile ( pattern, flags )"><span class="secnum">B.2.4.1</span> RegExp.prototype.compile ( <var>pattern</var>, <var>flags</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">C</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 1 Draft / March 27, 2024</h1><h1 class="title">Pattern Matching</h1>
+    </svg></div><div id="menu-spacer" class="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pins<button class="unpin-all">clear</button></div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle">+</span><a href="#welcome" title="Welcome">Welcome</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-todos" title="TODOs">TODOs</a></li><li><span class="item-toggle-none"></span><a href="#sec-nav" title="Introduction">Introduction</a></li><li><span class="item-toggle-none"></span><a href="#sec-notes-layering" title="Layering">Layering</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-overview" title="Overview"><span class="secnum">4</span> Overview</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-organization-of-this-specification" title="Organization of This Specification"><span class="secnum">4.5</span> Organization of This Specification</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-data-types-and-values" title="ECMAScript Data Types and Values"><span class="secnum">6</span> ECMAScript Data Types and Values</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-types" title="ECMAScript Language Types"><span class="secnum">6.1</span> ECMAScript Language Types</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-types-symbol-type" title="The Symbol Type"><span class="secnum">6.1.5</span> The Symbol Type</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-well-known-symbols" title="Well-Known Symbols"><span class="secnum">6.1.5.1</span> Well-Known Symbols</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-object-internal-methods-and-internal-slots" title="Object Internal Methods and Internal Slots"><span class="secnum">6.1.7</span> Object Internal Methods and Internal Slots</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations" title="Abstract Operations"><span class="secnum">7</span> Abstract Operations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-operations-on-objects" title="Operations on Objects"><span class="secnum">7.3</span> Operations on Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-initializeinstance" title="InitializeInstanceElements ( O, constructor )"><span class="secnum">7.3.34</span> InitializeInstanceElements ( <var>O</var>, <var>constructor</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations" title="Syntax-Directed Operations"><span class="secnum">8</span> Syntax-Directed Operations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations-scope-analysis" title="Scope Analysis"><span class="secnum">8.2</span> Scope Analysis</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-boundnames" title="Static Semantics: BoundNames"><span class="secnum">8.2.1</span> SS: BoundNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-declarationpart" title="Static Semantics: DeclarationPart"><span class="secnum">8.2.2</span> SS: DeclarationPart</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-isconstantdeclaration" title="Static Semantics: IsConstantDeclaration"><span class="secnum">8.2.3</span> SS: IsConstantDeclaration</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-lexicallydeclarednames" title="Static Semantics: LexicallyDeclaredNames"><span class="secnum">8.2.4</span> SS: LexicallyDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-lexicallyscopeddeclarations" title="Static Semantics: LexicallyScopedDeclarations"><span class="secnum">8.2.5</span> SS: LexicallyScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-vardeclarednames" title="Static Semantics: VarDeclaredNames"><span class="secnum">8.2.6</span> SS: VarDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-varscopeddeclarations" title="Static Semantics: VarScopedDeclarations"><span class="secnum">8.2.7</span> SS: VarScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevellexicallydeclarednames" title="Static Semantics: TopLevelLexicallyDeclaredNames"><span class="secnum">8.2.8</span> SS: TopLevelLexicallyDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevellexicallyscopeddeclarations" title="Static Semantics: TopLevelLexicallyScopedDeclarations"><span class="secnum">8.2.9</span> SS: TopLevelLexicallyScopedDeclarations</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevelvardeclarednames" title="Static Semantics: TopLevelVarDeclaredNames"><span class="secnum">8.2.10</span> SS: TopLevelVarDeclaredNames</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-toplevelvarscopeddeclarations" title="Static Semantics: TopLevelVarScopedDeclarations"><span class="secnum">8.2.11</span> SS: TopLevelVarScopedDeclarations</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-syntax-directed-operations-miscellaneous" title="Miscellaneous"><span class="secnum">8.6</span> Miscellaneous</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-bindinginitialization" title="Runtime Semantics: BindingInitialization"><span class="secnum">8.6.2</span> RS: BindingInitialization</a></li><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-iteratorbindinginitialization" title="Runtime Semantics: IteratorBindingInitialization"><span class="secnum">8.6.3</span> RS: IteratorBindingInitialization</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-executable-code-and-execution-contexts" title="Executable Code and Execution Contexts"><span class="secnum">9</span> Executable Code and Execution Contexts</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-weakly-hold-targets-processing-model" title="Processing Model of WeakRef and FinalizationRegistryweakly hold Targets"><span class="secnum">9.10</span> Processing Model of <del>WeakRef and FinalizationRegistry</del><ins>weakly hold</ins> Targets</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakly-hold-execution" title="Execution"><span class="secnum">9.10.3</span> Execution</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-lexical-grammar" title="ECMAScript Language: Lexical Grammar"><span class="secnum">12</span> ECMAScript Language: Lexical Grammar</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-automatic-semicolon-insertion" title="Automatic Semicolon Insertion"><span class="secnum">12.10</span> Automatic Semicolon Insertion</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-rules-of-automatic-semicolon-insertion" title="Rules of Automatic Semicolon Insertion"><span class="secnum">12.10.1</span> Rules of Automatic Semicolon Insertion</a></li><li><span class="item-toggle">+</span><a href="#sec-interesting-cases-of-automatic-semicolon-insertion" title="Interesting Cases of Automatic Semicolon Insertion"><span class="secnum">12.10.3</span> Interesting Cases of Automatic Semicolon Insertion</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-asi-cases-with-no-lineterminator-here" title="Cases of Automatic Semicolon Insertion and “[no LineTerminator here]”"><span class="secnum">12.10.3.2</span> Cases of Automatic Semicolon Insertion and “[no <emu-nt>LineTerminator</emu-nt> here]”</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-no-lineterminator-here-automatic-semicolon-insertion-list" title="List of Grammar Productions with Optional Operands and “[no LineTerminator here]”"><span class="secnum">12.10.3.2.1</span> List of Grammar Productions with Optional Operands and “[no <emu-nt>LineTerminator</emu-nt> here]”</a></li></ol></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-expressions" title="ECMAScript Language: Expressions"><span class="secnum">13</span> ECMAScript Language: Expressions</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-primary-expression" title="Primary Expression"><span class="secnum">13.2</span> Primary Expression</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-primary-expression-regular-expression-literals" title="Regular Expression Literals"><span class="secnum">13.2.7</span> Regular Expression Literals</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-primary-expression-regular-expression-literals-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">13.2.7.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-isvalidregularexpressionliteral" title="Static Semantics: IsValidRegularExpressionLiteral ( literal, canCreateBinding )"><span class="secnum">13.2.7.2</span> SS: IsValidRegularExpressionLiteral ( <var>literal</var>, <ins><var>canCreateBinding</var></ins> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-primary-expression-match-expression" title="Match Expression"><span class="secnum">13.2.10</span> Match Expression</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-relational-operators" title="Relational Operators"><span class="secnum">13.10</span> Relational Operators</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-relational-operators-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">13.10.1</span> RS: Evaluation</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-statements-and-declarations" title="ECMAScript Language: Statements and Declarations"><span class="secnum">14</span> ECMAScript Language: Statements and Declarations</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-iteration-statements" title="Iteration Statements"><span class="secnum">14.7</span> Iteration Statements</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-for-in-and-for-of-statements" title="The for-in, for-of, and for-await-of Statements"><span class="secnum">14.7.1</span> The <code>for</code>-<code>in</code>, <code>for</code>-<code>of</code>, and <code>for</code>-<code>await</code>-<code>of</code> Statements</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-try-statement" title="The try Statement"><span class="secnum">14.14</span> The <code>try</code> Statement</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-ecmascript-language-functions-and-classes" title="ECMAScript Language: Functions and Classes"><span class="secnum">15</span> ECMAScript Language: Functions and Classes</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-class-definitions" title="Class Definitions"><span class="secnum">15.7</span> Class Definitions</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-runtime-semantics-classdefinitionevaluation" title="Runtime Semantics: ClassDefinitionEvaluation"><span class="secnum">15.7.14</span> RS: ClassDefinitionEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-tail-position-calls" title="Tail Position Calls"><span class="secnum">15.10</span> Tail Position Calls</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-hascallintailposition" title="Static Semantics: HasCallInTailPosition"><span class="secnum">15.10.2</span> SS: HasCallInTailPosition</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-fundamental-objects" title="Fundamental Objects"><span class="secnum">20</span> Fundamental Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-object-objects" title="Object Objects"><span class="secnum">20.1</span> Object Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-object-constructor" title="Properties of the Object Constructor"><span class="secnum">20.1.2</span> Properties of the Object Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-object-@@custommatcher" title="Object [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.1.2.24</span> Object [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-function-objects" title="Function Objects"><span class="secnum">20.2</span> Function Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-function-constructor" title="Properties of the Function Constructor"><span class="secnum">20.2.2</span> Properties of the Function Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function-@@custommatcher" title="Function [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.2.2.2</span> Function [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-function-prototype-object" title="Properties of the Function Prototype Object"><span class="secnum">20.2.3</span> Properties of the Function Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-function.prototype-@@custommatcher" title="Function.prototype [ @@customMatcher ] ( subject, hint, receiver )"><span class="secnum">20.2.3.7</span> Function.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var>, <var>receiver</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-boolean-objects" title="Boolean Objects"><span class="secnum">20.3</span> Boolean Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-boolean-constructor" title="Properties of the Boolean Constructor"><span class="secnum">20.3.2</span> Properties of the Boolean Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-boolean-@@custommatcher" title="Boolean [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.3.2.2</span> Boolean [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-symbol-objects" title="Symbol Objects"><span class="secnum">20.4</span> Symbol Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-symbol-constructor" title="Properties of the Symbol Constructor"><span class="secnum">20.4.2</span> Properties of the Symbol Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-symbol.custommatcher" title="Symbol.customMatcher"><span class="secnum">20.4.2.17</span> Symbol.customMatcher</a></li><li><span class="item-toggle-none"></span><a href="#sec-symbol-@@custommatcher" title="Symbol [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.4.2.18</span> Symbol [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-error-objects" title="Error Objects"><span class="secnum">20.5</span> Error Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-error-constructor" title="The Error Constructor"><span class="secnum">20.5.1</span> The Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-error-message" title="Error ( message [ , options ] )"><span class="secnum">20.5.1.1</span> Error ( <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-error-constructors" title="Properties of the Error Constructor"><span class="secnum">20.5.2</span> Properties of the Error Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-error-@@custommatcher" title="Error [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.5.2.2</span> Error [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-error-instances" title="Properties of Error Instances"><span class="secnum">20.5.4</span> Properties of Error Instances</a></li><li><span class="item-toggle">+</span><a href="#sec-nativeerror-object-structure" title="NativeError Object Structure"><span class="secnum">20.5.6</span> <var>NativeError</var> Object Structure</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-nativeerror-constructors" title="The NativeError Constructors"><span class="secnum">20.5.6.1</span> The <var>NativeError</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-nativeerror" title="NativeError ( message [ , options ] )"><span class="secnum">20.5.6.1.1</span> <var>NativeError</var> ( <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-nativeerror-constructors" title="Properties of the NativeError Constructors"><span class="secnum">20.5.6.2</span> Properties of the <var>NativeError</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-nativeerror-@@custommatcher" title="NativeError [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.5.6.2.2</span> <var>NativeError</var> [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-nativeerror-instances" title="Properties of NativeError Instances"><span class="secnum">20.5.6.4</span> Properties of <var>NativeError</var> Instances</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-aggregate-error-objects" title="AggregateError Objects"><span class="secnum">20.5.7</span> AggregateError Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-aggregate-error-constructor" title="The AggregateError Constructor"><span class="secnum">20.5.7.1</span> The AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-aggregate-error" title="AggregateError ( errors, message [ , options ] )"><span class="secnum">20.5.7.1.1</span> AggregateError ( <var>errors</var>, <var>message</var> [ , <var>options</var> ] )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-aggregate-error-constructors" title="Properties of the AggregateError Constructor"><span class="secnum">20.5.7.2</span> Properties of the AggregateError Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-aggregate-error-@@custommatcher" title="AggregateError [ @@customMatcher ] ( subject, hint )"><span class="secnum">20.5.7.2.2</span> AggregateError [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-properties-of-aggregate-error-instances" title="Properties of AggregateError Instances"><span class="secnum">20.5.7.4</span> Properties of AggregateError Instances</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-numbers-and-dates" title="Numbers and Dates"><span class="secnum">21</span> Numbers and Dates</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-number-objects" title="Number Objects"><span class="secnum">21.1</span> Number Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-number-constructor" title="Properties of the Number Constructor"><span class="secnum">21.1.2</span> Properties of the Number Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-number-@@custommatcher" title="Number [ @@customMatcher ] ( subject, hint )"><span class="secnum">21.1.2.16</span> Number [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-bigint-objects" title="BigInt Objects"><span class="secnum">21.2</span> BigInt Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-bigint-constructor" title="Properties of the BigInt Constructor"><span class="secnum">21.2.2</span> Properties of the BigInt Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-bigint-@@custommatcher" title="BigInt [ @@customMatcher ] ( subject, hint )"><span class="secnum">21.2.2.4</span> BigInt [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-date-objects" title="Date Objects"><span class="secnum">21.4</span> Date Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-date-constructor" title="Properties of the Date Constructor"><span class="secnum">21.4.3</span> Properties of the Date Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-date-@@custommatcher" title="Date [ @@customMatcher ] ( subject, hint )"><span class="secnum">21.4.3.5</span> Date [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-text-processing" title="Text Processing"><span class="secnum">22</span> Text Processing</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-string-objects" title="String Objects"><span class="secnum">22.1</span> String Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-string-constructor" title="Properties of the String Constructor"><span class="secnum">22.1.2</span> Properties of the String Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-string-@@custommatcher" title="String [ @@customMatcher ] ( subject, hint )"><span class="secnum">22.1.2.5</span> String [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-regexp-regular-expression-objects" title="RegExp (Regular Expression) Objects"><span class="secnum">22.2</span> RegExp (Regular Expression) Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-patterns" title="Patterns"><span class="secnum">22.2.1</span> Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-patterns-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">22.2.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-static-semantics-capturinggroupname" title="Static Semantics: CapturingGroupName"><span class="secnum">22.2.1.9</span> SS: CapturingGroupName</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations-for-regexp-creation" title="Abstract Operations for RegExp Creation"><span class="secnum">22.2.3</span> Abstract Operations for RegExp Creation</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexpcreate" title="RegExpCreate ( P, F )"><span class="secnum">22.2.3.1</span> RegExpCreate ( <var>P</var>, <var>F</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-regexpinitialize" title="RegExpInitialize ( obj, pattern, flags, canCreateBinding )"><span class="secnum">22.2.3.3</span> RegExpInitialize ( <var>obj</var>, <var>pattern</var>, <var>flags</var>, <ins><var>canCreateBinding</var></ins> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-parsepattern" title="Static Semantics: ParsePattern ( patternText, u, v, canCreateBinding )"><span class="secnum">22.2.3.4</span> SS: ParsePattern ( <var>patternText</var>, <var>u</var>, <var>v</var>, <ins><var>canCreateBinding</var></ins> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-regexp-constructor" title="The RegExp Constructor"><span class="secnum">22.2.4</span> The RegExp Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp-pattern-flags" title="RegExp ( pattern, flags )"><span class="secnum">22.2.4.1</span> RegExp ( <var>pattern</var>, <var>flags</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-regexp-constructor" title="Properties of the RegExp Constructor"><span class="secnum">22.2.5</span> Properties of the RegExp Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp-@@custommatcher" title="RegExp [ @@customMatcher ] ( subject, hint )"><span class="secnum">22.2.5.3</span> RegExp [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-regexp-prototype-object" title="Properties of the RegExp Prototype Object"><span class="secnum">22.2.6</span> Properties of the RegExp Prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp.prototype-@@custommatcher" title="RegExp.prototype [ @@customMatcher ] ( subject, hint )"><span class="secnum">22.2.6.20</span> RegExp.prototype [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-indexed-collections" title="Indexed Collections"><span class="secnum">23</span> Indexed Collections</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-array-objects" title="Array Objects"><span class="secnum">23.1</span> Array Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-array-constructor" title="Properties of the Array Constructor"><span class="secnum">23.1.2</span> Properties of the Array Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-array-@@custommatcher" title="Array [ @@customMatcher ] ( subject, hint )"><span class="secnum">23.1.2.6</span> Array [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-typedarray-objects" title="TypedArray Objects"><span class="secnum">23.2</span> TypedArray Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-typedarray-constructors" title="Properties of the TypedArray Constructors"><span class="secnum">23.2.6</span> Properties of the <var>TypedArray</var> Constructors</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-_typedarray_-@@custommatcher" title="TypedArray [ @@customMatcher ] ( subject, hint )"><span class="secnum">23.2.6.3</span> <var>TypedArray</var> [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-keyed-collections" title="Keyed Collections"><span class="secnum">24</span> Keyed Collections</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-map-objects" title="Map Objects"><span class="secnum">24.1</span> Map Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-map-constructor" title="Properties of the Map Constructor"><span class="secnum">24.1.2</span> Properties of the Map Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-map-@@custommatcher" title="Map [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.1.2.3</span> Map [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-set-objects" title="Set Objects"><span class="secnum">24.2</span> Set Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-set-constructor" title="Properties of the Set Constructor"><span class="secnum">24.2.2</span> Properties of the Set Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-set-@@custommatcher" title="Set [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.2.2.3</span> Set [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-weakmap-objects" title="WeakMap Objects"><span class="secnum">24.3</span> WeakMap Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weakmap-constructor" title="Properties of the WeakMap Constructor"><span class="secnum">24.3.2</span> Properties of the WeakMap Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakmap-@@custommatcher" title="WeakMap [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.3.2.2</span> WeakMap [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-weakset-objects" title="WeakSet Objects"><span class="secnum">24.4</span> WeakSet Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weakset-constructor" title="Properties of the WeakSet Constructor"><span class="secnum">24.4.2</span> Properties of the WeakSet Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakset-@@custommatcher" title="WeakSet [ @@customMatcher ] ( subject, hint )"><span class="secnum">24.4.2.2</span> WeakSet [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-structured-data" title="Structured Data"><span class="secnum">25</span> Structured Data</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-arraybuffer-objects" title="ArrayBuffer Objects"><span class="secnum">25.1</span> ArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-arraybuffer-constructor" title="Properties of the ArrayBuffer Constructor"><span class="secnum">25.1.5</span> Properties of the ArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-arraybuffer-@@custommatcher" title="ArrayBuffer [ @@customMatcher ] ( subject, hint )"><span class="secnum">25.1.5.4</span> ArrayBuffer [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-sharedarraybuffer-objects" title="SharedArrayBuffer Objects"><span class="secnum">25.2</span> SharedArrayBuffer Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-sharedarraybuffer-constructor" title="Properties of the SharedArrayBuffer Constructor"><span class="secnum">25.2.4</span> Properties of the SharedArrayBuffer Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-sharedarraybuffer-@@custommatcher" title="SharedArrayBuffer [ @@customMatcher ] ( subject, hint )"><span class="secnum">25.2.4.3</span> SharedArrayBuffer [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-dataview-objects" title="DataView Objects"><span class="secnum">25.3</span> DataView Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-dataview-constructor" title="Properties of the DataView Constructor"><span class="secnum">25.3.3</span> Properties of the DataView Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-dataview-@@custommatcher" title="DataView [ @@customMatcher ] ( subject, hint )"><span class="secnum">25.3.3.2</span> DataView [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-managing-memory" title="Managing Memory"><span class="secnum">26</span> Managing Memory</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-weak-ref-objects" title="WeakRef Objects"><span class="secnum">26.1</span> WeakRef Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-weak-ref-constructor" title="Properties of the WeakRef Constructor"><span class="secnum">26.1.2</span> Properties of the WeakRef Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-weakref-@@custommatcher" title="WeakRef [ @@customMatcher ] ( subject, hint )"><span class="secnum">26.1.2.2</span> WeakRef [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-finalization-registry-objects" title="FinalizationRegistry Objects"><span class="secnum">26.2</span> FinalizationRegistry Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-finalization-registry-constructor" title="Properties of the FinalizationRegistry Constructor"><span class="secnum">26.2.2</span> Properties of the FinalizationRegistry Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-finalizationregistry-@@custommatcher" title="FinalizationRegistry [ @@customMatcher ] ( subject, hint )"><span class="secnum">26.2.2.2</span> FinalizationRegistry [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-control-abstraction-objects" title="Control Abstraction Objects"><span class="secnum">27</span> Control Abstraction Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-promise-objects" title="Promise Objects"><span class="secnum">27.2</span> Promise Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-properties-of-the-promise-constructor" title="Properties of the Promise Constructor"><span class="secnum">27.2.4</span> Properties of the Promise Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-promise-@@custommatcher" title="Promise [ @@customMatcher ] ( subject, hint )"><span class="secnum">27.2.4.9</span> Promise [ @@customMatcher ] ( <var>subject</var>, <var>hint</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-reflection" title="Reflection"><span class="secnum">28</span> Reflection</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-proxy-objects" title="Proxy Objects"><span class="secnum">28.2</span> Proxy Objects</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-proxy-constructor" title="The Proxy Constructor"><span class="secnum">28.2.1</span> The Proxy Constructor</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-proxy-@@custommatcher" title="Proxy [ @@customMatcher ] ( )"><span class="secnum">28.2.1.2</span> Proxy [ @@customMatcher ] ( )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-pattern-matching" title="Pattern Matching"><span class="secnum">30</span> <ins>Pattern Matching</ins></a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-match-patterns" title="Match Patterns"><span class="secnum">30.1</span> Match Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-match-patterns-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">30.1.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-is-optional-pattern" title="Static Semantics: IsOptionalPattern"><span class="secnum">30.1.2</span> SS: IsOptionalPattern</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-pattern-matches" title="Runtime Semantics: MatchPatternMatches"><span class="secnum">30.1.3</span> RS: MatchPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-primitive-pattern-matches" title="Runtime Semantics: PrimitivePatternMatches"><span class="secnum">30.1.4</span> RS: PrimitivePatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-binding-pattern-matches" title="Runtime Semantics: BindingPatternMatches"><span class="secnum">30.1.5</span> RS: BindingPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-regular-expression-pattern-matches" title="Runtime Semantics: RegularExpressionPatternMatches"><span class="secnum">30.1.6</span> RS: RegularExpressionPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-member-expression-pattern-matches" title="Runtime Semantics: MemberExpressionPatternMatches"><span class="secnum">30.1.7</span> RS: MemberExpressionPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-object-pattern-matches" title="Runtime Semantics: ObjectPatternMatches"><span class="secnum">30.1.8</span> RS: ObjectPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-object-pattern-inner-matches" title="Runtime Semantics: ObjectPatternInnerMatches"><span class="secnum">30.1.9</span> RS: ObjectPatternInnerMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-array-pattern-matches" title="Runtime Semantics: ArrayPatternMatches"><span class="secnum">30.1.10</span> RS: ArrayPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-list-pattern-matches" title="Runtime Semantics: ListPatternMatches"><span class="secnum">30.1.11</span> RS: ListPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-list-pattern-inner-matches" title="Runtime Semantics: ListPatternInnerMatches"><span class="secnum">30.1.12</span> RS: ListPatternInnerMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-unary-algebraic-pattern-matches" title="Runtime Semantics: UnaryAlgebraicPatternMatches"><span class="secnum">30.1.13</span> RS: UnaryAlgebraicPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-relational-pattern-matches" title="Runtime Semantics: RelationalPatternMatches"><span class="secnum">30.1.14</span> RS: RelationalPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-if-pattern-matches" title="Runtime Semantics: IfPatternMatches"><span class="secnum">30.1.15</span> RS: IfPatternMatches</a></li><li><span class="item-toggle-none"></span><a href="#sec-combined-match-pattern-matches" title="Runtime Semantics: CombinedMatchPatternMatches"><span class="secnum">30.1.16</span> RS: CombinedMatchPatternMatches</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-match-expression" title="The match Expression"><span class="secnum">30.2</span> The <code>match</code> Expression</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-match-expression-static-semantics-early-errors" title="Static Semantics: Early Errors"><span class="secnum">30.2.1</span> SS: Early Errors</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-runtime-semantics-evaluation" title="Runtime Semantics: Evaluation"><span class="secnum">30.2.2</span> RS: Evaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-clauses-runtime-semantics-evaluation" title="Runtime Semantics: MatchExpressionClausesEvaluation"><span class="secnum">30.2.3</span> RS: MatchExpressionClausesEvaluation</a></li><li><span class="item-toggle-none"></span><a href="#sec-match-expression-clause-runtime-semantics-evaluation" title="Runtime Semantics: MatchExpressionClauseEvaluation"><span class="secnum">30.2.4</span> RS: MatchExpressionClauseEvaluation</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-abstract-operations-for-pattern-matching" title="Abstract Operations for Pattern Matching"><span class="secnum">30.3</span> Abstract Operations for Pattern Matching</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-invoke-custom-matcher" title="InvokeCustomMatcher ( matcher, subject, cacheGroup, kind, receiver )"><span class="secnum">30.3.1</span> InvokeCustomMatcher ( <var>matcher</var>, <var>subject</var>, <var>cacheGroup</var>, <var>kind</var>, <var>receiver</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-validatecustommatcherhint" title="ValidateCustomMatcherHint ( hint [ , kind ] )"><span class="secnum">30.3.2</span> ValidateCustomMatcherHint ( <var>hint</var> [ , <var>kind</var> ] )</a></li><li><span class="item-toggle-none"></span><a href="#sec-creatematchcache" title="CreateMatchCache ( )"><span class="secnum">30.3.3</span> CreateMatchCache ( )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-match-cache" title="GetMatchCache ( subject, cacheGroup )"><span class="secnum">30.3.4</span> GetMatchCache ( <var>subject</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-has-property-cached" title="HasPropertyCached ( subject, cacheGroup, propertyName )"><span class="secnum">30.3.5</span> HasPropertyCached ( <var>subject</var>, <var>cacheGroup</var>, <var>propertyName</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-cached" title="GetCached ( subject, cacheGroup, propertyName )"><span class="secnum">30.3.6</span> GetCached ( <var>subject</var>, <var>cacheGroup</var>, <var>propertyName</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-iterator-cached" title="GetIteratorCached ( subject, cacheGroup )"><span class="secnum">30.3.7</span> GetIteratorCached ( <var>subject</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-iterator-step-cached" title="IteratorStepCached ( iterator, cacheGroup )"><span class="secnum">30.3.8</span> IteratorStepCached ( <var>iterator</var>, <var>cacheGroup</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-get-iterator-nth-value-cached" title="GetIteratorNthValueCached ( iterator, cacheGroup, n )"><span class="secnum">30.3.9</span> GetIteratorNthValueCached ( <var>iterator</var>, <var>cacheGroup</var>, <var>n</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-finish-list-match" title="FinishListMatch ( iterator, cacheGroup, expectedLength )"><span class="secnum">30.3.10</span> FinishListMatch ( <var>iterator</var>, <var>cacheGroup</var>, <var>expectedLength</var> )</a></li><li><span class="item-toggle-none"></span><a href="#sec-finish-match" title="FinishMatch ( matchCompletion, cacheGroup )"><span class="secnum">30.3.11</span> FinishMatch ( <var>matchCompletion</var>, <var>cacheGroup</var> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-grammar-summary" title="Grammar Summary"><span class="secnum">A</span> Grammar Summary</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-expressions" title="Expressions"><span class="secnum">A.1</span> Expressions</a></li><li><span class="item-toggle-none"></span><a href="#sec-annex-match-patterns" title="Patterns"><span class="secnum">A.9</span> Patterns</a></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-additional-ecmascript-features-for-web-browsers" title="Additional ECMAScript Features for Web Browsers"><span class="secnum">B</span> Additional ECMAScript Features for Web Browsers</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-additional-syntax" title="Additional Syntax"><span class="secnum">B.1</span> Additional Syntax</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-regular-expressions-patterns" title="Regular Expressions Patterns"><span class="secnum">B.1.2</span> Regular Expressions Patterns</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-parsepattern-annexb" title="Static Semantics: ParsePattern ( patternText, u, v, canCreateBinding )"><span class="secnum">B.1.2.9</span> SS: ParsePattern ( <var>patternText</var>, <var>u</var>, <var>v</var><ins>, <var>canCreateBinding</var></ins> )</a></li></ol></li></ol></li><li><span class="item-toggle">+</span><a href="#sec-additional-built-in-properties" title="Additional Built-in Properties"><span class="secnum">B.2</span> Additional Built-in Properties</a><ol class="toc"><li><span class="item-toggle">+</span><a href="#sec-additional-properties-of-the-regexp.prototype-object" title="Additional Properties of the RegExp.prototype Object"><span class="secnum">B.2.4</span> Additional Properties of the RegExp.prototype Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#sec-regexp.prototype.compile" title="RegExp.prototype.compile ( pattern, flags )"><span class="secnum">B.2.4.1</span> RegExp.prototype.compile ( <var>pattern</var>, <var>flags</var> )</a></li></ol></li></ol></li></ol></li><li><span class="item-toggle-none"></span><a href="#sec-copyright-and-software-license" title="Copyright &amp; Software License"><span class="secnum">C</span> Copyright &amp; Software License</a></li></ol></div></div><div id="spec-container"><h1 class="version">Stage 1 Draft / March 28, 2024</h1><h1 class="title">Pattern Matching</h1>
 <style>
   #welcome .secnum, [title="Welcome"] .secnum {
     display: none;
diff --git a/package.json b/package.json
index bc9f590..a0cdb84 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
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   "license": "MIT",
   "devDependencies": {
-    "@tc39/ecma262-biblio": "^2.1.2653",
-    "ecmarkup": "^18.0.0"
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+    "ecmarkup": "^18.3.1"
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