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Adding property

name ops/sec samples
Directly in the object 90,089,393 45060451
Using dot notation 68,577,012 34294399
Using define property (writable) 4,412,085 2206462
Using define property initialized (writable) 6,045,521 3023066
Using define property (getter) 2,189,460 1094761
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 21:58:51 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Array.append (number)

type amount time elapsed
array.push 10 0.004ms
new Array(length) 10 0.002ms
array.push 100 0.108ms
new Array(length) 100 0.01ms
array.push 1,000 0.027ms
new Array(length) 1,000 0.015ms
array.push 10,000 0.253ms
new Array(length) 10,000 0.136ms
array.push 1,000,000 29.892ms
new Array(length) 1,000,000 6.314ms
array.push 100,000,000 1,891.71ms
new Array(length) 100,000,000 4,114.286ms

Array.append (string)

type amount time elapsed
array.push 10 0.006ms
new Array(length) 10 0.003ms
array.push 100 0.016ms
new Array(length) 100 0.013ms
array.push 1,000 0.035ms
new Array(length) 1,000 0.02ms
array.push 10,000 18.266ms
new Array(length) 10,000 5.231ms
array.push 1,000,000 165.476ms
new Array(length) 1,000,000 7.576ms
array.push 100,000,000 2,014.58ms
new Array(length) 100,000,000 4,719.61ms

Array Creation

name ops/sec samples
new Array 321 161
Array.from 23 12
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:01:45 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Blob

name ops/sec samples
new Blob (128) 5,302 2656
new Blob (1024) 655 329
text (128) 4,222 2116
text (1024) 532 267
arrayBuffer (128) 4,231 2116
arrayBuffer (1024) 533 268
slice (0, 64) 157,721 79259
slice (0, 512) 32,687 16348
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:03:25 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Comparison using instanceof

name ops/sec samples
[True conditional] Using instanceof only 454,543 227279
[True conditional] Using constructor name 355,248 177625
[True conditional] Check if property is valid then instanceof 349,599 174871
[False conditional] Using instanceof only 97,461,125 48734473
[False conditional] Using constructor name 97,033,887 49136340
[False conditional] Check if property is valid then instanceof 98,735,233 49370107
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:04:48 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Crypto Verify

name ops/sec samples
crypto.createVerify('RSA-SHA256') 6,771 3386
crypto.verify('RSA-SHA256') 6,909 3455
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:05:42 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Date toISOString

name ops/sec samples
new Date().toISOString() 1,374,137 687136
fromUnixToISOString(new Date()) 1,994,792 997499
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:07:07 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Date format MM/DD/YYYY

name ops/sec samples
Intl.DateTimeFormat().format(Date.now()) 18,420 9211
Intl.DateTimeFormat().format(new Date()) 18,446 9224
Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(Date.now()) 18,379 9190
Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(new Date()) 18,109 9055
Reusing Intl.DateTimeFormat() 476,467 238235
Date.toLocaleDateString() 937,911 468956
Date.toLocaleDateString(undefined, twoDigitsLocaleOptions) 22,327 11166
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:08:19 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Date String coersion

name ops/sec samples
Using String() 868,752 434377
Using brackets {} 895,435 447719
Using '' + 1,010,711 505410
Using date.toString() 1,172,828 587682
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:09:40 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Deleting properties

name ops/sec samples
Using delete property 4,025,729 2012979
Using delete property (proto: null) 15,874,867 7946781
Using delete property (cached proto: null) 3,954,631 1977479
Using undefined assignment 69,901,466 34953365
Using undefined assignment (proto: null) 17,089,541 8546085
Using undefined property (cached proto: null) 70,112,166 35056230
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:11:11 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Node.js Error

name ops/sec samples
Error 419,699 209931
NodeError 338,800 169403
NodeError Range 330,638 165500
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:12:45 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Function return

name ops/sec samples
Function returning null 1,926,490 963453
Function returning explicitly undefined 1,858,048 930461
Function returning implicitly undefined 1,708,379 854225
Function returning string 1,866,335 933451
Function returning integer 1,733,730 866880
Function returning float 1,858,100 929478
Function returning functions 1,818,245 909586
Function returning arrow functions 1,735,588 867868
Function returning empty object 1,749,101 874652
Function returning empty array 1,772,475 887711
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:13:46 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Array.includes vs raw comparison

name ops/sec samples
using Array.includes 92,192,714 46096460
using Array.includes (first item) 82,169,994 41085002
Using raw comparison 99,624,251 49812131
Using raw comparison (first item) 99,706,392 49853202
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:15:20 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Object.keys vs Object.getOwnPropertyNames comparison

name ops/sec samples
Using Object.keys() 49,036,589 24521916
Using Object.getOwnPropertyNames() 41,561,813 20812793
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:16:22 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Get the last item of an Array

name ops/sec samples
Length = 100 - Array.at 131,081,537 65540792
Length = 10_000 - Array.at 97,857,346 49008243
Length = 1_000_000 - Array.at 97,742,413 48871227
Length = 100 - Array[length - 1] 98,712,758 49366822
Length = 10_000 - Array[length - 1] 98,323,969 49162033
Length = 1_000_000 - Array[length - 1] 96,703,460 48354152
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:17:41 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Math.floor vs ~

name ops/sec samples
Math.floor (small) 138,961,287 69483505
~ (small) 96,156,888 48078872
Math.floor (long) 98,592,829 49312884
~ (long) 95,472,506 47741867
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:18:38 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Object Creation

name ops/sec samples
Object.create(null) 42,586,636 21306387
Object.create({}) 1,952,616 983951
Cached Empty.prototype 73,515,860 36758748
Empty.prototype 2,397,832 1213550
Empty class 1,509,930 754966
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:20:26 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Optional Chain (?) vs && operator

name ops/sec samples
Using optional chain (obj.field?.field2) (Valid) 145,835,956 72918530
Using optional chain (obj.field?.field2) (undefined) 99,021,733 49510872
Using and operator (obj.field && obj.field.field2) (Valid) 98,400,632 49200342
Using and operator (obj.field && obj.field.field2) (undefined) 98,924,022 49462695
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:21:46 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Parsing Integer

name ops/sec samples
Using parseInt(x, 10) - small number (2 len) 136,529,625 68267206
Using parseInt(x, 10) - big number (10 len) 97,121,606 48561689
Using + - small number (2 len) 92,679,462 46363940
Using + - big number (10 len) 96,166,195 48083144
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:22:34 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Possible undefined Function

name ops/sec samples
Using if to check function existence 962,415 481221
Using ? operator to avoid rejection 1,025,993 515879
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:23:44 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Private Property

name ops/sec samples
Raw usage private field 135,881,932 67942180
Raw usage underscore usage 98,821,632 49410825
Manipulating private properties using # 96,267,213 48133615
Manipulating private properties using underscore(_) 98,311,292 49194032
Manipulating private properties using Symbol 97,176,293 48588958
Manipulating private properties using PrivateSymbol 35,622,437 17813540
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:24:49 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Property access after shape transition

name ops/sec samples
Adding property after object creation - small object 8,077,968 4039040
Adding property in the object creation - small object 7,528,168 3797190
Adding property after the function creation - small class 249,619 125148
Adding property in the function creation - small class 271,863 135932
Adding property after the class creation - small class 258,211 129530
Adding property in the class creation - small class 259,234 132556
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:26:52 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Property Getter Access

name ops/sec samples
Getter (class) 150,277,841 75171410
Getter 51,307,048 25659764
Method 100,763,960 50389402
DefineProperty (getter) 98,660,471 49330276
DefineProperty (getter & enumerable=false) 50,087,425 25044953
DefineProperty (getter & configurable=false) 97,355,154 48677653
DefineProperty (getter & enumerable=false & configurable=false) 51,476,272 25773810
DefineProperty (writable) 99,292,951 49647351
DefineProperty (writable & enumerable=false) 99,082,142 49541103
DefineProperty (writable & enumerable=false & configurable=false) 98,473,294 49241307
DefineProperties (getter) 49,285,533 24643112
DefineProperties (getter & enumerable=false) 49,379,727 24695435
DefineProperties (getter & enumerable=false & configurable=false) 51,477,071 25738748
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:28:10 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Property Setter Access

name ops/sec samples
Setter (class) 120,914,193 60467040
Setter 10,922,153 5461549
Method 80,219,166 40110265
DefineProperty (setter) 82,091,910 41045961
DefineProperty (setter & enumerable=false) 10,820,384 5410195
DefineProperty (setter & configurable=false) 11,026,152 5513079
DefineProperty (setter & enumerable=false & configurable=false) 10,865,002 5432505
DefineProperty (writable) 57,544,427 28774877
DefineProperty (writable & enumerable=false) 82,988,435 41494464
DefineProperty (writable & enumerable=false & configurable=false) 82,750,662 41377334
DefineProperties (setter) 79,515,602 39760345
DefineProperties (setter & enumerable=false) 10,808,961 5404486
DefineProperties (setter & enumerable=false & configurable=false) 10,745,003 5372522
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:29:03 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

replace vs replaceAll comparison

name ops/sec samples
Using replace(//g) 3,327,761 1664123
Using replaceAll() 3,173,138 1586727
Using replaceAll(//g) 2,954,547 1477275
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:30:36 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Shallow Copy

name ops/sec samples
{ ...object } 23,866,701 11934262
{ ...object, proto: null } 2,542,283 1272917
{ ...object, newProp: true } 20,859,609 10429888
structuredClone 296,628 148329
JSON.parse + JSON.stringify 296,454 148228
loop + object.keys starting with {} 1,625,988 813079
loop + object.keys starting with { proto: null } 898,386 451373
loop + object.keys starting with { randomProp: true } 655,443 327751
object.keys + reduce(FN, {}) 1,706,517 853313
object.keys + reduce(FN, { proto: null }) 922,009 461012
object.keys + reduce(FN, { newProp: true }) 648,998 324507
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:31:32 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Sorting Map

name ops/sec samples
Sort using default 306,352 153177
Sort using first char 1,291,047 645916
Sort using localeCompare 1,179,265 589723
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:33:10 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Object.assign VS spread operator

name ops/sec samples
{...bigObject} - Total keys: 1000 1,699 850
{...smallObject} - Total keys: 2 55,195,465 27598245
Object.assign({}, bigObject, anotherBigObject) - Total keys: 1000 - creating new object 1,027 514
Object.assign(bigObject, anotherBigObject) - mutating bigObject 6,554 3278
{ ...bigObject, ...anotherBigObject } 1,078 540
Object.assign({}, smallObject, anotherSmallObject) - creating new object 12,618,800 6309516
Object.assign(smallObject, anotherSmallObject) - mutating smallObject 28,351,755 14175881
{ ...smallObject, ...anotherSmallObject } 20,053,238 10029196
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:34:02 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Stream.Readable

name ops/sec samples
streams.Readable reading 1e3 * "some data" 1,787 894
streams.web.Readable reading 1e3 * "some data" 1,705 854
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:35:37 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Stream.Writable

name ops/sec samples
streams.Writable writing 1e3 * "some data" 10,394 5212
streams.web.WritableStream writing 1e3 * "some data" 1,635 818
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:36:31 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

String concat

name ops/sec samples
Using + sign 149,497,498 74761374
Using backtick (`) 94,071,366 47035691
Using array.join 9,962,952 4981479
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:37:43 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

endsWith comparison

name ops/sec samples
(short string) (true) String#endsWith 128,521,829 64338024
(short string) (true) String#slice and strict comparison 50,908,536 25457083
(long string) (true) String#endsWith 55,608,429 27804220
(long string) (true) String#slice and strict comparison 46,077,236 23043525
(short string) (false) String#endsWith 95,740,357 47870187
(short string) (false) String#slice and strict comparison 51,102,766 25557367
(long string) (false) String#endsWith 86,852,165 43426088
(long string) (false) String#slice and strict comparison 45,174,660 22593992
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:39:16 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

String searching

name ops/sec samples
Using includes 136,251,361 68128724
Using indexof 15,442,147 7721246
Using RegExp.test 12,800,892 6401086
Using RegExp.text with cached regex pattern 13,781,845 6890923
Using new RegExp.test 4,575,564 2287843
Using new RegExp.test with cached regex pattern 5,379,402 2689708
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:40:54 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

startsWith comparison

name ops/sec samples
(short string) (true) String#startsWith 127,976,366 63988540
(short string) (true) String#slice and strict comparison 58,354,959 29177750
(long string) (true) String#startsWith 64,522,356 32261201
(long string) (true) String#slice and strict comparison 53,236,320 26621299
(short string) (false) String#startsWith 91,437,261 45718636
(short string) (false) String#slice and strict comparison 57,466,295 28734690
(long string) (false) String#startsWith 87,468,950 43745945
(long string) (false) String#slice and strict comparison 52,479,757 26239879
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:42:35 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Super vs This

name ops/sec samples
Using super 124,641,121 62334890
Using this 97,779,425 48897456
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:43:22 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0

Getting unix time

name ops/sec samples
new Date().getTime() 10,230,418 5115367
Date.now() 18,655,711 9364020
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Fri Oct 11 2024 22:44:38 GMT+0000 (Coordinated Universal Time)
  • Node: v22.9.0