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Adding property

name ops/sec samples
Directly in the object 103,670,460 51842768
Using dot notation 74,170,400 37111111
Using define property (writable) 4,185,897 2093102
Using define property initialized (writable) 5,836,156 2918273
Using define property (getter) 2,215,100 1107559
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 16:44:00 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Array.append (number)

type amount time elapsed
array.push 10 0.017ms
new Array(length) 10 0.002ms
array.push 100 0.086ms
new Array(length) 100 0.011ms
array.push 1,000 0.048ms
new Array(length) 1,000 0.015ms
array.push 10,000 0.259ms
new Array(length) 10,000 0.136ms
array.push 1,000,000 22.399ms
new Array(length) 1,000,000 15.657ms
array.push 100,000,000 1,774.154ms
new Array(length) 100,000,000 4,426.278ms

Array.append (string)

type amount time elapsed
array.push 10 0.007ms
new Array(length) 10 0.003ms
array.push 100 0.018ms
new Array(length) 100 0.012ms
array.push 1,000 0.039ms
new Array(length) 1,000 0.02ms
array.push 10,000 0.344ms
new Array(length) 10,000 0.227ms
array.push 1,000,000 22.413ms
new Array(length) 1,000,000 7.795ms
array.push 100,000,000 1,940.322ms
new Array(length) 100,000,000 4,420.924ms

Array Creation

name ops/sec samples
new Array 263 132
Array.from 23 12
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 16:58:03 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Blob

name ops/sec samples
new Blob (128) 4,756 2379
new Blob (1024) 614 308
text (128) 4,841 2426
text (1024) 592 297
arrayBuffer (128) 4,879 2440
arrayBuffer (1024) 606 304
slice (0, 64) 156,997 94538
slice (0, 512) 33,703 16852
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:03:54 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Comparison using instanceof

name ops/sec samples
[True conditional] Using instanceof only 414,495 207248
[True conditional] Using constructor name 335,907 168027
[True conditional] Check if property is valid then instanceof 332,352 166352
[False conditional] Using instanceof only 98,267,465 49139881
[False conditional] Using constructor name 96,745,829 48372923
[False conditional] Check if property is valid then instanceof 96,547,738 48274589
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:10:03 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Crypto Verify

name ops/sec samples
crypto.createVerify('RSA-SHA256') 6,229 3115
crypto.verify('RSA-SHA256') 6,471 3236
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:15:38 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Date toISOString

name ops/sec samples
new Date().toISOString() 1,502,132 751272
fromUnixToISOString(new Date()) 2,134,896 1067559
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:21:15 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Date format MM/DD/YYYY

name ops/sec samples
Intl.DateTimeFormat().format(Date.now()) 19,090 9546
Intl.DateTimeFormat().format(new Date()) 19,098 9550
Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(Date.now()) 18,590 9297
Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(new Date()) 18,655 9328
Reusing Intl.DateTimeFormat() 452,681 287525
Date.toLocaleDateString() 724,525 362466
Date.toLocaleDateString(undefined, twoDigitsLocaleOptions) 23,222 11612
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:27:20 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Date String coersion

name ops/sec samples
Using String() 1,084,539 542307
Using brackets {} 1,038,013 519007
Using '' + 1,034,085 517043
Using date.toString() 1,166,181 583151
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:33:07 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Deleting properties

name ops/sec samples
Using delete property 3,903,647 1951930
Using delete property (proto: null) 16,592,144 8296075
Using delete property (cached proto: null) 3,890,492 1945546
Using undefined assignment 77,381,207 38690610
Using undefined assignment (proto: null) 18,450,766 9226130
Using undefined property (cached proto: null) 75,787,892 37898378
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:38:54 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Node.js Error

name ops/sec samples
Error 390,719 195386
NodeError 322,704 161357
NodeError Range 320,555 160278
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:44:21 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Function return

name ops/sec samples
Function returning null 1,924,883 962964
Function returning explicitly undefined 1,953,036 977695
Function returning implicitly undefined 1,972,461 987334
Function returning string 1,949,491 974823
Function returning integer 2,008,822 1004412
Function returning float 1,977,707 988854
Function returning functions 1,909,920 954961
Function returning arrow functions 2,000,805 1000446
Function returning empty object 1,965,833 982917
Function returning empty array 1,976,924 988529
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:50:19 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Array.includes vs raw comparison

name ops/sec samples
using Array.includes 84,470,380 42236465
using Array.includes (first item) 75,994,202 38052157
Using raw comparison 101,627,581 50813797
Using raw comparison (first item) 99,905,404 50023164
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:56:18 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Object.keys vs Object.getOwnPropertyNames comparison

name ops/sec samples
Using Object.keys() 49,988,434 25004396
Using Object.getOwnPropertyNames() 40,611,235 20329331
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:01:38 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Get the last item of an Array

name ops/sec samples
Length = 100 - Array.at 131,797,738 65975464
Length = 10_000 - Array.at 83,240,010 41644276
Length = 1_000_000 - Array.at 96,760,883 48380452
Length = 100 - Array[length - 1] 91,095,922 45548399
Length = 10_000 - Array[length - 1] 86,583,634 43291825
Length = 1_000_000 - Array[length - 1] 97,859,278 48929661
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:07:18 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Math.floor vs ~

name ops/sec samples
Math.floor (small) 139,584,953 69800791
~ (small) 93,191,462 46596005
Math.floor (long) 94,132,130 47066072
~ (long) 93,807,310 46903662
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:12:57 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Object Creation

name ops/sec samples
Object.create(null) 40,873,418 20484049
Object.create({}) 1,982,277 991140
Cached Empty.prototype 79,580,401 39872234
Empty.prototype 2,235,615 1119316
Empty class 1,397,210 704432
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:18:46 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Optional Chain (?) vs && operator

name ops/sec samples
Using optional chain (obj.field?.field2) (Valid) 145,795,415 73046212
Using optional chain (obj.field?.field2) (undefined) 97,364,319 48748319
Using and operator (obj.field && obj.field.field2) (Valid) 102,770,258 51385133
Using and operator (obj.field && obj.field.field2) (undefined) 102,045,992 51023076
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:24:22 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Parsing Integer

name ops/sec samples
Using parseInt(x, 10) - small number (2 len) 141,005,001 70784213
Using parseInt(x, 10) - big number (10 len) 97,356,466 48692810
Using + - small number (2 len) 103,400,299 51701531
Using + - big number (10 len) 101,799,486 50911695
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:30:10 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Possible undefined Function

name ops/sec samples
Using if to check function existence 1,138,402 571533
Using ? operator to avoid rejection 1,194,650 597776
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:35:58 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Private Property

name ops/sec samples
Raw usage private field 132,946,525 66473283
Raw usage underscore usage 97,029,318 48659710
Manipulating private properties using # 92,648,528 46324464
Manipulating private properties using underscore(_) 98,494,514 49254932
Manipulating private properties using Symbol 98,826,255 49413136
Manipulating private properties using PrivateSymbol 37,109,970 18555649
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:41:34 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Property access after shape transition

name ops/sec samples
Adding property after object creation - small object 7,777,846 3893230
Adding property in the object creation - small object 7,356,522 3678263
Adding property after the function creation - small class 230,304 115154
Adding property in the function creation - small class 245,889 123669
Adding property after the class creation - small class 242,719 121856
Adding property in the class creation - small class 238,981 119491
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:47:14 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Property Getter Access

name ops/sec samples
Getter (class) 139,357,176 69748575
Getter 52,866,461 26433238
Method 100,831,913 50415966
DefineProperty (getter) 86,262,667 43168255
DefineProperty (getter & enumerable=false) 53,435,342 26719023
DefineProperty (getter & configurable=false) 101,452,757 50726385
DefineProperty (getter & enumerable=false & configurable=false) 52,912,250 26456141
DefineProperty (writable) 102,048,020 51024843
DefineProperty (writable & enumerable=false) 101,573,435 50786727
DefineProperty (writable & enumerable=false & configurable=false) 101,361,895 50681007
DefineProperties (getter) 50,929,186 25464597
DefineProperties (getter & enumerable=false) 53,558,349 26780450
DefineProperties (getter & enumerable=false & configurable=false) 53,500,802 26750774
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:53:37 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Property Setter Access

name ops/sec samples
Setter (class) 145,502,949 72752119
Setter 11,149,804 5574915
Method 97,887,721 48956032
DefineProperty (setter) 100,320,695 50162625
DefineProperty (setter & enumerable=false) 11,810,902 5905454
DefineProperty (setter & configurable=false) 11,605,233 5802620
DefineProperty (setter & enumerable=false & configurable=false) 11,817,948 5912493
DefineProperty (writable) 99,547,653 49776010
DefineProperty (writable & enumerable=false) 100,549,746 50495126
DefineProperty (writable & enumerable=false & configurable=false) 100,198,246 50099130
DefineProperties (setter) 99,038,687 49519377
DefineProperties (setter & enumerable=false) 10,940,252 5470129
DefineProperties (setter & enumerable=false & configurable=false) 11,235,148 5617577
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:00:20 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

replace vs replaceAll comparison

name ops/sec samples
Using replace(//g) 3,406,272 1703138
Using replaceAll() 3,103,340 1553501
Using replaceAll(//g) 3,082,683 1541343
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:06:27 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Shallow Copy

name ops/sec samples
{ ...object } 24,314,355 12159045
{ ...object, proto: null } 2,568,263 1284200
{ ...object, newProp: true } 20,545,083 10273322
structuredClone 272,109 136055
JSON.parse + JSON.stringify 273,144 136573
loop + object.keys starting with {} 1,581,570 790827
loop + object.keys starting with { proto: null } 870,741 435727
loop + object.keys starting with { randomProp: true } 635,933 317967
object.keys + reduce(FN, {}) 1,624,367 812184
object.keys + reduce(FN, { proto: null }) 889,153 444720
object.keys + reduce(FN, { newProp: true }) 664,229 332115
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:12:31 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Sorting Map

name ops/sec samples
Sort using default 309,129 154663
Sort using first char 1,390,385 696972
Sort using localeCompare 1,278,265 639263
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:18:29 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Object.assign VS spread operator

name ops/sec samples
{...bigObject} - Total keys: 1000 1,918 960
{...smallObject} - Total keys: 2 57,097,545 28549182
Object.assign({}, bigObject, anotherBigObject) - Total keys: 1000 - creating new object 1,118 560
Object.assign(bigObject, anotherBigObject) - mutating bigObject 6,774 3388
{ ...bigObject, ...anotherBigObject } 1,192 597
Object.assign({}, smallObject, anotherSmallObject) - creating new object 12,877,333 6438694
Object.assign(smallObject, anotherSmallObject) - mutating smallObject 28,346,483 14175030
{ ...smallObject, ...anotherSmallObject } 21,081,508 10540774
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:24:20 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Stream.Readable

name ops/sec samples
streams.Readable reading 1e3 * "some data" 2,311 1157
streams.web.Readable reading 1e3 * "some data" 2,259 1131
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:30:08 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Stream.Writable

name ops/sec samples
streams.Writable writing 1e3 * "some data" 6,370 3187
streams.web.WritableStream writing 1e3 * "some data" 2,137 1069
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:35:03 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

String concat

name ops/sec samples
Using + sign 149,913,213 74956718
Using backtick (`) 100,415,056 50686076
Using array.join 9,837,415 4918717
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:41:26 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

endsWith comparison

name ops/sec samples
(short string) (true) String#endsWith 111,654,553 55827290
(short string) (true) String#slice and strict comparison 58,275,924 29143965
(long string) (true) String#endsWith 60,748,114 30380046
(long string) (true) String#slice and strict comparison 52,720,372 26361140
(short string) (false) String#endsWith 89,525,608 44763533
(short string) (false) String#slice and strict comparison 58,124,587 29062328
(long string) (false) String#endsWith 84,188,712 42094389
(long string) (false) String#slice and strict comparison 52,466,898 26233457
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:46:53 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

String searching

name ops/sec samples
Using includes 135,563,051 67782765
Using indexof 15,884,570 7942526
Using RegExp.test 13,231,719 6616686
Using RegExp.text with cached regex pattern 14,451,034 7225525
Using new RegExp.test 4,559,621 2280019
Using new RegExp.test with cached regex pattern 5,285,915 2644464
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:53:30 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

startsWith comparison

name ops/sec samples
(short string) (true) String#startsWith 112,031,811 56015965
(short string) (true) String#slice and strict comparison 59,179,482 29611859
(long string) (true) String#startsWith 63,082,978 31541494
(long string) (true) String#slice and strict comparison 52,280,956 26141696
(short string) (false) String#startsWith 97,999,772 49058391
(short string) (false) String#slice and strict comparison 58,819,553 29420785
(long string) (false) String#startsWith 85,372,033 42951892
(long string) (false) String#slice and strict comparison 52,955,689 26480751
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:59:34 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Super vs This

name ops/sec samples
Using super 127,533,917 63766978
Using this 97,485,340 48761304
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 20:08:50 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0

Getting unix time

name ops/sec samples
new Date().getTime() 11,497,657 5749183
Date.now() 20,082,158 10051704
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 20:14:21 GMT+0000 (Coordinated Universal Time)
  • Node: v21.0.0