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Adding property

name ops/sec samples
Directly in the object 105,354,657 52677580
Using dot notation 72,858,303 36505473
Using define property (writable) 4,933,376 2466690
Using define property initialized (writable) 6,866,553 3433432
Using define property (getter) 2,455,899 1227986
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 16:45:31 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Array.append (number)

type amount time elapsed
array.push 10 0.004ms
new Array(length) 10 0.002ms
array.push 100 0.072ms
new Array(length) 100 0.006ms
array.push 1,000 0.028ms
new Array(length) 1,000 0.013ms
array.push 10,000 0.263ms
new Array(length) 10,000 0.136ms
array.push 1,000,000 28.305ms
new Array(length) 1,000,000 7.137ms
array.push 100,000,000 1,851.871ms
new Array(length) 100,000,000 3,945.689ms

Array.append (string)

type amount time elapsed
array.push 10 0.005ms
new Array(length) 10 0.003ms
array.push 100 0.016ms
new Array(length) 100 0.012ms
array.push 1,000 0.036ms
new Array(length) 1,000 0.019ms
array.push 10,000 18.209ms
new Array(length) 10,000 6.65ms
array.push 1,000,000 142.99ms
new Array(length) 1,000,000 7.163ms
array.push 100,000,000 1,979.962ms
new Array(length) 100,000,000 4,548.412ms

Array Creation

name ops/sec samples
new Array 332 167
Array.from 24 13
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 16:59:26 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Blob

name ops/sec samples
new Blob (128) 4,567 2284
new Blob (1024) 625 315
text (128) 3,738 1871
text (1024) 536 275
arrayBuffer (128) 4,329 2179
arrayBuffer (1024) 537 269
slice (0, 64) 146,774 77711
slice (0, 512) 31,704 15853
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:05:29 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Comparison using instanceof

name ops/sec samples
[True conditional] Using instanceof only 455,614 228102
[True conditional] Using constructor name 368,301 184151
[True conditional] Check if property is valid then instanceof 367,092 183550
[False conditional] Using instanceof only 94,613,392 47306709
[False conditional] Using constructor name 94,706,984 47375194
[False conditional] Check if property is valid then instanceof 96,160,248 48097177
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:11:28 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Crypto Verify

name ops/sec samples
crypto.createVerify('RSA-SHA256') 6,641 3321
crypto.verify('RSA-SHA256') 6,809 3405
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:17:01 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Date toISOString

name ops/sec samples
new Date().toISOString() 1,405,288 702661
fromUnixToISOString(new Date()) 2,152,480 1076241
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:22:34 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Date format MM/DD/YYYY

name ops/sec samples
Intl.DateTimeFormat().format(Date.now()) 19,164 9583
Intl.DateTimeFormat().format(new Date()) 19,139 9572
Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(Date.now()) 19,163 9582
Intl.DateTimeFormat(undefined, twoDigitsLocaleOptions).format(new Date()) 18,057 9210
Reusing Intl.DateTimeFormat() 606,398 303387
Date.toLocaleDateString() 1,103,192 551736
Date.toLocaleDateString(undefined, twoDigitsLocaleOptions) 23,412 11707
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:28:51 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Date String coersion

name ops/sec samples
Using String() 1,034,940 517474
Using brackets {} 1,054,166 527084
Using '' + 1,053,103 526552
Using date.toString() 1,155,629 577815
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:34:30 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Deleting properties

name ops/sec samples
Using delete property 4,068,660 2034332
Using delete property (proto: null) 16,978,415 8489211
Using delete property (cached proto: null) 4,038,433 2019409
Using undefined assignment 74,430,591 37219608
Using undefined assignment (proto: null) 18,594,854 9297912
Using undefined property (cached proto: null) 74,603,525 37301767
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:40:20 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Node.js Error

name ops/sec samples
Error 429,662 214868
NodeError 347,339 173672
NodeError Range 344,859 172431
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:46:22 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Function return

name ops/sec samples
Function returning null 1,839,054 920006
Function returning explicitly undefined 1,766,366 883358
Function returning implicitly undefined 1,897,055 948616
Function returning string 1,800,893 902021
Function returning integer 1,884,780 942391
Function returning float 1,853,762 927320
Function returning functions 1,673,022 836512
Function returning arrow functions 1,832,722 916362
Function returning empty object 1,848,329 924171
Function returning empty array 1,838,117 921048
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:52:15 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Array.includes vs raw comparison

name ops/sec samples
using Array.includes 90,754,886 45378116
using Array.includes (first item) 82,494,612 41249777
Using raw comparison 98,511,723 49255868
Using raw comparison (first item) 96,557,480 48295199
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 17:57:40 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Object.keys vs Object.getOwnPropertyNames comparison

name ops/sec samples
Using Object.keys() 49,310,967 24659334
Using Object.getOwnPropertyNames() 42,366,582 21183342
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:02:57 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Get the last item of an Array

name ops/sec samples
Length = 100 - Array.at 132,386,004 66208172
Length = 10_000 - Array.at 86,770,303 43389558
Length = 1_000_000 - Array.at 99,193,056 49985508
Length = 100 - Array[length - 1] 98,222,323 49111170
Length = 10_000 - Array[length - 1] 97,918,678 48959364
Length = 1_000_000 - Array[length - 1] 99,309,669 49670135
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:08:48 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Math.floor vs ~

name ops/sec samples
Math.floor (small) 137,155,659 68604898
~ (small) 97,172,246 48586127
Math.floor (long) 96,935,546 48468146
~ (long) 98,290,384 49150634
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:14:25 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Object Creation

name ops/sec samples
Object.create(null) 41,611,272 20807019
Object.create({}) 2,107,667 1054124
Cached Empty.prototype 112,346,353 56177964
Empty.prototype 2,514,749 1264364
Empty class 1,558,830 779421
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:20:21 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Optional Chain (?) vs && operator

name ops/sec samples
Using optional chain (obj.field?.field2) (Valid) 148,757,558 74378819
Using optional chain (obj.field?.field2) (undefined) 98,110,006 49055376
Using and operator (obj.field && obj.field.field2) (Valid) 98,992,645 49496324
Using and operator (obj.field && obj.field.field2) (undefined) 98,771,417 49385795
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:25:48 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Parsing Integer

name ops/sec samples
Using parseInt(x, 10) - small number (2 len) 139,710,708 69855369
Using parseInt(x, 10) - big number (10 len) 98,909,300 49456287
Using + - small number (2 len) 99,470,325 49736067
Using + - big number (10 len) 99,721,670 49860842
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:31:32 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Possible undefined Function

name ops/sec samples
Using if to check function existence 989,293 497050
Using ? operator to avoid rejection 1,048,910 531828
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:37:17 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Private Property

name ops/sec samples
Raw usage private field 143,368,906 71684476
Raw usage underscore usage 96,300,313 48150167
Manipulating private properties using # 95,570,864 47846290
Manipulating private properties using underscore(_) 99,325,166 49668956
Manipulating private properties using Symbol 98,661,992 49646528
Manipulating private properties using PrivateSymbol 37,130,017 18574216
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:43:00 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Property access after shape transition

name ops/sec samples
Adding property after object creation - small object 8,354,246 4177259
Adding property in the object creation - small object 8,278,490 4139250
Adding property after the function creation - small class 263,474 134632
Adding property in the function creation - small class 251,336 126951
Adding property after the class creation - small class 277,262 140143
Adding property in the class creation - small class 275,659 137836
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:48:39 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Property Getter Access

name ops/sec samples
Getter (class) 149,782,416 74891562
Getter 49,224,533 24612271
Method 100,477,459 50238819
DefineProperty (getter) 99,051,657 49538847
DefineProperty (getter & enumerable=false) 46,221,888 23110973
DefineProperty (getter & configurable=false) 98,435,985 49217998
DefineProperty (getter & enumerable=false & configurable=false) 51,897,065 25949101
DefineProperty (writable) 98,838,767 49419463
DefineProperty (writable & enumerable=false) 97,276,532 48638272
DefineProperty (writable & enumerable=false & configurable=false) 96,580,045 48290253
DefineProperties (getter) 49,966,247 24983128
DefineProperties (getter & enumerable=false) 51,597,698 25798853
DefineProperties (getter & enumerable=false & configurable=false) 50,837,472 25423800
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 18:55:18 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Property Setter Access

name ops/sec samples
Setter (class) 133,706,878 66853462
Setter 11,020,361 5510183
Method 83,939,241 41971573
DefineProperty (setter) 85,474,393 42737287
DefineProperty (setter & enumerable=false) 11,338,321 5669164
DefineProperty (setter & configurable=false) 11,412,688 5706347
DefineProperty (setter & enumerable=false & configurable=false) 11,163,488 5581810
DefineProperty (writable) 93,986,633 46993323
DefineProperty (writable & enumerable=false) 95,636,253 47818137
DefineProperty (writable & enumerable=false & configurable=false) 94,019,491 47009761
DefineProperties (setter) 93,968,148 46988064
DefineProperties (setter & enumerable=false) 11,333,264 5666815
DefineProperties (setter & enumerable=false & configurable=false) 11,226,923 5613538
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:02:02 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

replace vs replaceAll comparison

name ops/sec samples
Using replace(//g) 3,386,280 1693264
Using replaceAll() 3,316,649 1662642
Using replaceAll(//g) 3,081,890 1540946
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:07:28 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Shallow Copy

name ops/sec samples
{ ...object } 24,698,204 12363889
{ ...object, proto: null } 2,542,973 1271686
{ ...object, newProp: true } 21,478,682 10739342
structuredClone 312,136 156155
JSON.parse + JSON.stringify 309,484 154799
loop + object.keys starting with {} 1,674,608 837371
loop + object.keys starting with { proto: null } 904,485 452243
loop + object.keys starting with { randomProp: true } 676,206 338157
object.keys + reduce(FN, {}) 1,733,642 866855
object.keys + reduce(FN, { proto: null }) 953,509 476755
object.keys + reduce(FN, { newProp: true }) 694,299 347210
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:14:08 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Sorting Map

name ops/sec samples
Sort using default 310,400 155465
Sort using first char 1,390,555 696043
Sort using localeCompare 1,265,789 633045
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:19:52 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Object.assign VS spread operator

name ops/sec samples
{...bigObject} - Total keys: 1000 1,846 924
{...smallObject} - Total keys: 2 60,099,156 30049597
Object.assign({}, bigObject, anotherBigObject) - Total keys: 1000 - creating new object 1,113 557
Object.assign(bigObject, anotherBigObject) - mutating bigObject 6,645 3323
{ ...bigObject, ...anotherBigObject } 1,170 586
Object.assign({}, smallObject, anotherSmallObject) - creating new object 13,576,607 6789163
Object.assign(smallObject, anotherSmallObject) - mutating smallObject 28,381,137 14190575
{ ...smallObject, ...anotherSmallObject } 21,478,887 10739764
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:25:56 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Stream.Readable

name ops/sec samples
streams.Readable reading 1e3 * "some data" 2,080 1049
streams.web.Readable reading 1e3 * "some data" 1,837 920
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:31:32 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Stream.Writable

name ops/sec samples
streams.Writable writing 1e3 * "some data" 11,252 5627
streams.web.WritableStream writing 1e3 * "some data" 1,717 868
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:37:11 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

String concat

name ops/sec samples
Using + sign 146,826,651 73455018
Using backtick (`) 85,889,756 42945317
Using array.join 10,115,028 5057516
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:42:52 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

endsWith comparison

name ops/sec samples
(short string) (true) String#endsWith 127,013,371 63507868
(short string) (true) String#slice and strict comparison 60,501,133 30271089
(long string) (true) String#endsWith 63,560,780 31781503
(long string) (true) String#slice and strict comparison 54,806,425 27404139
(short string) (false) String#endsWith 93,573,670 46786860
(short string) (false) String#slice and strict comparison 60,519,280 30262717
(long string) (false) String#endsWith 86,030,991 43016540
(long string) (false) String#slice and strict comparison 54,686,011 27343014
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:48:52 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

String searching

name ops/sec samples
Using includes 137,463,093 68731564
Using indexof 16,078,526 8040203
Using RegExp.test 13,268,565 6635279
Using RegExp.text with cached regex pattern 14,521,533 7261833
Using new RegExp.test 4,704,632 2352429
Using new RegExp.test with cached regex pattern 5,507,605 2753804
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 19:54:55 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

startsWith comparison

name ops/sec samples
(short string) (true) String#startsWith 126,589,063 63294539
(short string) (true) String#slice and strict comparison 60,375,624 30245825
(long string) (true) String#startsWith 63,280,920 31640598
(long string) (true) String#slice and strict comparison 54,283,379 27141697
(short string) (false) String#startsWith 93,748,836 46876729
(short string) (false) String#slice and strict comparison 60,445,194 30222605
(long string) (false) String#startsWith 87,917,047 43980194
(long string) (false) String#slice and strict comparison 54,281,871 27140942
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 20:01:06 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Super vs This

name ops/sec samples
Using super 125,079,745 62545767
Using this 96,500,329 48393262
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 20:10:11 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0

Getting unix time

name ops/sec samples
new Date().getTime() 9,836,232 4918390
Date.now() 19,263,162 9632930
Environment
  • Machine: linux x64 | 4 vCPUs | 7.6GB Mem
  • Run: Tue Oct 29 2024 20:15:43 GMT+0000 (Coordinated Universal Time)
  • Node: v22.11.0