Readme.md

Operators

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Operators

The typeof Operator

typeof 42;              // "number"
typeof 1.4142135;       // "number"
typeof 'hello';         // "string"
typeof 'false';         // "string"
typeof false;           // "boolean"
typeof true;            // "boolean"
typeof {key: 'value' }; // "object"
typeof function () {};  // "function"
typeof Math.sin;        // "function"
typeof null;            // "object"
typeof undefined;       // "undefined"

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Operators

Unary Operators

++value  // increments value by 1 before the statement is evaluated 

value++  // increments value by 1 after the statement is evaluated 

--value  // decremented value by 1 before the statement is evaluated 

value--  // decremented value by 1 after the statement is evaluated 

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Operators

Logical Operators

!value  // negate the boolean value

a && b  // returns the logical AND of a and b 

a || b  // returns the logical OR of a and b

Operators precedence

! is executed first, then comes && and finally ||

Use parentheses instead of relying on operator precedence,
in order to make your code easier to read and understand.

false && false || true && true;     // true
(false && false) || (true && true); // true

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Operators

Basic operation

a + b // returns the sum of its operands

a - b // returns the difference of its operands

a * b // multiply two numbers

a / b // divides the first operand by the second operand

a % b // returns the remainder of the division 

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Operators

Relational Operators

a < b  // return true if a is less-than b, false otherwise

a > b  // return true if a is greater-than b, false otherwise

a <= b // return true if a is less-than-or-equal-to b, false otherwise

a >= b // return true if a is greater-than-or-equal-to b, false otherwise 

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Operators

Equality operators

a === b // returns true if a is equals to b, false otherwise

a !== b // returns true if a is not equals to b, false otherwise

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Operators

Conditional Operator

conditional_expression ? true_case : false_case;

if conditional_expression is true
then returns true_case value
else returns false_case value

var a = 5;
var b = 6;
var max = (a > b) ? a : b; // max is 6

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Operators

Assignment Operators

variable = value // assigns value to variable

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Operators

Assignment Operators

variable += value // variable = variable + value

variable -= value // variable = variable - value

variable *= value // variable = variable * value

variable /= value // variable = variable / value

variable %= value // variable = variable % value