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Run results for: Lodash uniqBy vs Set with Array of object

Lodash uniqBy vs [...new Set()]

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36
Chrome 118
Mac OS X 10.15.7
Desktop
one year ago
Test name Executions per second
Lodash uniqBy 2392.5 Ops/sec
new Set() Destructuring 1975.3 Ops/sec
uniq for loop 1114.1 Ops/sec
uniq by forEach 981.0 Ops/sec
uniq by filter 570.6 Ops/sec
HTML Preparation code:
​x
 
1
​
2
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
Script Preparation code:
 
var myArr = Array.from({
    length: 16000
}, () => ({ value: Math.floor(Math.random() * 1000) }));
​
var myCopy = null;
Tests:

  • Lodash uniqBy

     
    myCopy = _.uniqBy(myArr, 'value').map(({ value }) => value);

  • new Set() Destructuring

     
    myCopy = [...new Set(myArr.map(({ value }) => value))]

  • uniq for loop

     
    var seen = {};
    var out = [];
    const len = myArr.length;
    var j = 0;
    for (var i = 0; i < len; i += 1) {
        var item = myArr[i].value;
      if (seen[item] !== 1) {
        seen[item] = 1;
        out[j++] = item;
      }
    }
    myCopy = out;

  • uniq by forEach

     
    var result = [];
    myArr.forEach((item) => {
        if (result.indexOf(item.value) < 0) {
            result.push(item.value);
        }
    });
    myCopy = result;

  • uniq by filter

     
    var mapMyArr = myArr.map(({ value }) => value);
    myCopy = mapMyArr.filter((value, index, array) => array.indexOf(value) === index);