Run results for: _.uniqueBy vs Set of two different objects

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser: Chrome 142

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 8 months ago

Set

406K/s

_.uniqBy

191K/s

View exact numbers

Test name	Executions per second
✓ Set	405,698 Ops/sec
_.uniqBy	191,331 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 MyArr = Array.from(
  {
    length: 100,
  },
  () => {
    return {
      a: Math.floor(Math.random() * 500),
    };
  }
);

var MySecondArr = Array.from(
  {
    length: 100,
  },
  () => {
    return {
      a: Math.floor(Math.random() * 1000),
    };
  }
);

var myCopy = null;

Tests:

Set
const ids = new Set(MyArr.map((item) => item.a)) myCopy = MyArr.concat(MySecondArr.filter((item) => !ids.has(item.id)))
_.uniqBy
myCopy = _.uniqBy(MyArr.concat(MySecondArr), 'a');