Run results for: splice vs copyWithin

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

splice()

1.4M/s

copyWithin()

662K/s

View exact numbers

Test name	Executions per second
✓ splice()	1,413,995 Ops/sec
copyWithin()	661,695 Ops/sec

Script Preparation code:

var colors = ["red", "blue"];
var index = 1;
var value = "white";

Tests:

splice()
colors.splice(index, 0, "white"); colors.splice(index, 1)
copyWithin()
colors.length++; colors.copyWithin(index + 1, index); colors[index] = value; colors.splice(index, 1)