Run results for: JS unshift vs splice vs unshift + splice (3 possibilities) FINAL RESULT!

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36 OPR/114.0.0.0

Browser: Opera 114

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

unshift with Splice

2.8M/s

Splice with findIndex

43K/s

Unshift with find

15K/s

View exact numbers

Test name	Executions per second
✓ unshift with Splice	2,809,842 Ops/sec
Splice with findIndex	42,832 Ops/sec
Unshift with find	14,521 Ops/sec

Script Preparation code:

var data1 = [];
for(i=0; i<10000; i++){data1.push(i);}
var data2 = [];
for(i=0; i<10000; i++){data2.push(i);}
var data3 = [];
for(i=0; i<10000; i++){data2.push(i);}

Tests:

Unshift with find
const rest = data1.filter(item => item !== 500); rest.unshift(data1.find(item => item == 500)); return rest;
Splice with findIndex
const cautelarPosition = data2.findIndex(item => item == 500); data2.splice(0, 0, data2.splice(cautelarPosition, 1)[0]); return data2;
unshift with Splice
const cautelarIndex = data3.findIndex(item => item == 500); data3.unshift(data3.splice(cautelarIndex, 1)[0]); return data3;