Run results for: lodash merge vs custom merge js

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser: Chrome 128

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
lodash merge	308380.8 Ops/sec
custom merge	133812.8 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

function customMerge(target, source) {
  // Iterate through `source` properties and if an `Object` set property to merge of `target` and `source` properties
  for (const key of Object.keys(source)) {
    if (source[key] instanceof Object) Object.assign(source[key], customMerge(target[key], source[key]))
  }

  // Join `target` and modified `source`
  Object.assign(target || {}, source)
  return target
}

Tests:

lodash merge
var a = { "_id": "66fbb8cedd880f8726d3430d", "index": 0, "guid": "0a9b7fd8-2e1c-423e-9129-a4b34edd6ea0", "isActive": false, "balance": "$3,498.70", "picture": "http://placehold.it/32x32", "age": 31, "eyeColor": "blue", "name": "Estrada Mcfarland", "gender": "male", "company": "BULLZONE", "email": "estradamcfarland@bullzone.com", "phone": "+1 (875) 565-3286", "address": "344 Oakland Place, Caledonia, Ohio, 8843", "about": "Cupidatat velit minim Lorem quis non. Ullamco magna qui commodo aliquip cillum anim ea aliqua. Tempor ullamco nulla cillum mollit veniam tempor ipsum ipsum culpa ipsum. Quis sit velit minim ad eiusmod veniam aliquip non anim veniam anim enim est cupidatat. Pariatur ipsum ipsum commodo irure laborum qui velit do est ullamco. Tempor velit ullamco Lorem non laboris culpa ullamco excepteur aliquip laboris cillum occaecat adipisicing anim.\r\n", "registered": "2014-01-31T12:10:19 -07:00", "latitude": 37.048423, "longitude": 131.714333, "tags": [ "reprehenderit", "ea", "esse", "ipsum", "Lorem", "dolor", "non" ], "friends": [ { "id": 0, "name": "Bender Battle" }, { "id": 1, "name": "Flowers Huff" }, { "id": 2, "name": "Amanda Armstrong" }]}; var b = { "_id": "66fbb8fb871c6f25070b297b", "index": 0, "guid": "65f9bf15-96b5-4e1c-8d17-a7b9f9f52cf3", "isActive": false, "balance": "$2,098.99", "picture": "http://placehold.it/32x32", "age": 39, "eyeColor": "blue", "name": "Cherry Hendrix", "gender": "female", "company": "MAGNINA", "email": "cherryhendrix@magnina.com", "phone": "+1 (842) 469-3783", "address": "645 Myrtle Avenue, Sharon, Nevada, 4405", "about": "Consequat Lorem Lorem quis ea mollit Lorem deserunt eiusmod elit. Eu est duis in incididunt exercitation consequat duis sint quis adipisicing nisi. Quis sunt excepteur laborum cillum cillum ea ullamco tempor duis esse eiusmod laboris. Velit aliquip consequat ullamco laboris laboris sit cillum commodo fugiat labore sint cillum consequat.\r\n", "registered": "2023-06-02T08:28:00 -07:00", "latitude": -67.322848, "longitude": 19.323204, "tags": [ "amet", "laboris", "cillum", "irure", "velit", "officia", "in" ], "friends": [ { "id": 0, "name": "Shanna Shelton" }, { "id": 1, "name": "Lucile Kelley" }, { "id": 2, "name": "Walker Hall" } ], "greeting": "Hello, Cherry Hendrix! You have 3 unread messages.", "favoriteFruit": "apple" }; var c = _.merge(a, b);
custom merge
var a = { "_id": "66fbb8cedd880f8726d3430d", "index": 0, "guid": "0a9b7fd8-2e1c-423e-9129-a4b34edd6ea0", "isActive": false, "balance": "$3,498.70", "picture": "http://placehold.it/32x32", "age": 31, "eyeColor": "blue", "name": "Estrada Mcfarland", "gender": "male", "company": "BULLZONE", "email": "estradamcfarland@bullzone.com", "phone": "+1 (875) 565-3286", "address": "344 Oakland Place, Caledonia, Ohio, 8843", "about": "Cupidatat velit minim Lorem quis non. Ullamco magna qui commodo aliquip cillum anim ea aliqua. Tempor ullamco nulla cillum mollit veniam tempor ipsum ipsum culpa ipsum. Quis sit velit minim ad eiusmod veniam aliquip non anim veniam anim enim est cupidatat. Pariatur ipsum ipsum commodo irure laborum qui velit do est ullamco. Tempor velit ullamco Lorem non laboris culpa ullamco excepteur aliquip laboris cillum occaecat adipisicing anim.\r\n", "registered": "2014-01-31T12:10:19 -07:00", "latitude": 37.048423, "longitude": 131.714333, "tags": [ "reprehenderit", "ea", "esse", "ipsum", "Lorem", "dolor", "non" ], "friends": [ { "id": 0, "name": "Bender Battle" }, { "id": 1, "name": "Flowers Huff" }, { "id": 2, "name": "Amanda Armstrong" }]}; var b = { "_id": "66fbb8fb871c6f25070b297b", "index": 0, "guid": "65f9bf15-96b5-4e1c-8d17-a7b9f9f52cf3", "isActive": false, "balance": "$2,098.99", "picture": "http://placehold.it/32x32", "age": 39, "eyeColor": "blue", "name": "Cherry Hendrix", "gender": "female", "company": "MAGNINA", "email": "cherryhendrix@magnina.com", "phone": "+1 (842) 469-3783", "address": "645 Myrtle Avenue, Sharon, Nevada, 4405", "about": "Consequat Lorem Lorem quis ea mollit Lorem deserunt eiusmod elit. Eu est duis in incididunt exercitation consequat duis sint quis adipisicing nisi. Quis sunt excepteur laborum cillum cillum ea ullamco tempor duis esse eiusmod laboris. Velit aliquip consequat ullamco laboris laboris sit cillum commodo fugiat labore sint cillum consequat.\r\n", "registered": "2023-06-02T08:28:00 -07:00", "latitude": -67.322848, "longitude": 19.323204, "tags": [ "amet", "laboris", "cillum", "irure", "velit", "officia", "in" ], "friends": [ { "id": 0, "name": "Shanna Shelton" }, { "id": 1, "name": "Lucile Kelley" }, { "id": 2, "name": "Walker Hall" } ], "greeting": "Hello, Cherry Hendrix! You have 3 unread messages.", "favoriteFruit": "apple" }; var c = customMerge(a,b);