Run results for: Remove duplicate: Pure JS VS Lodash

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36

Browser: Chrome 87

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Pure JS: map	792564.7 Ops/sec
Pure JS: forEach	1139559.0 Ops/sec
Lodash: uniqBy	2127325.0 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:

var arr = [
  {
   id: 123,
   name: "abc",
  },
  {
   id: 1234,
   name: "abcd",
  },
  {
   id: 123,
   name: "abc",
  },
  {
    id: 4321,
    name: 'dcba',
  },
];

var key='id';

Tests:

Pure JS: map
var indexArray = []; var newArray = arr.map(a => { if (indexArray.indexOf(a[key]) < 0) { indexArray.push(a[key]); return a; }; return -1; }).filter(a => a != -1);
Pure JS: forEach
var indexArray = []; var newArray = []; arr.forEach(a => { if (indexArray.indexOf(a[key]) < 0) { indexArray.push(a[key]); newArray.push(a); }});
Lodash: uniqBy
var newArray = _.uniqBy(arr, key);

Run results for: Remove duplicate: Pure JS VS Lodash

Pure JS: map

Pure JS: forEach

Lodash: uniqBy