Run results for: lodash difference vs reduce vs filter vs find

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.3 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.3.1

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
lodash	20922.6 Ops/sec
reduce	1066.7 Ops/sec
set filter	47194.1 Ops/sec
find filter	2059.0 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 list_1 = []
var list_2 = []


for(var i =0;i<1000;i++){
  list_1.push(Math.random().toString(36).slice(2, 7));
}

for(var i =0;i<200;i++){
  list_2.push(Math.random().toString(36).slice(2, 7));
}

Tests:

lodash
_.difference(list_1, list_2)
reduce
var excludeMap = list_2.reduce((all, item) => ({ ...all, [item]: true }), {}); list_1.filter((item) => !excludeMap?.[item]);
set filter
var toRemove = new Set(list_2); list_1.filter(i => !toRemove.has(i))
find filter
list_1.filter(i => list_2.find(i2 => i2 === i))

Run results for: lodash difference vs reduce vs filter vs find

exclude all the elements for one array from another array

lodash

reduce

set filter

find filter