Run results for: splice vs unshift by winensf

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

splice

9K/s

unshift

6K/s

View exact numbers

Test name	Executions per second
✓ splice	9,388 Ops/sec
unshift	6,135 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) }