Run results for: splice vs unshift by winensf

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 16

Operating system: iOS 16.1.1

Device Platform: Mobile

Date tested: 2 years ago

Benchmark engine: Benchmark.js

splice

12K/s

unshift

5K/s

View exact numbers

Test name	Executions per second
✓ splice	12,465 Ops/sec
unshift	4,764 Ops/sec

Script Preparation code:

const x = [];
for (var i = 0; i < 20000; i++) {
    x.push(i);
}

Tests:

splice
const x = []; for (var i = 0; i < 20000; i++) { x.push(i); } for(var i = 0; i < 50; i++){ x.splice(20000+i-1, 0, 20000+i) }
unshift
const x = []; for (var i = 0; i < 20000; i++) { x.push(i); } for(var i = 0; i < 50; i++){ x.unshift(20000+i) }