Run results for: lodash UniqueWith vs custom filter with isEqual for duplicates

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

filter

2.9M/s

_.uniqWith

2.3M/s

View exact numbers

Test name	Executions per second
✓ filter	2,888,068 Ops/sec
_.uniqWith	2,290,624 Ops/sec

Script Preparation code:

var myArray = Array(7000).fill({a:1, b:2});

Tests:

_.uniqWith
myArray = _.uniqWith(myArray, _.isEqual);
filter
const trackObj = {}; myArray = myArray.filter(item => { if (trackObj[item.a]) { const foundDuplicateValue = (trackObj[item.a]).some((val) => { return _.isEqual(val, item.b); }); // If no duplicate value found, do nothing in this if block. // If duplicate value found, return false. This will filter out this datum. if (foundDuplicateValue) return false; } if (!trackObj[item.a]) { trackObj[item.a] = [item.b]; } else { trackObj[item.a].push(item.b); } return true; })