Run results for: splice vs copyWithin

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:154.0) Gecko/20100101 Firefox/154.0

Browser: Firefox 154

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 20 days ago

Benchmark engine: Benchmark.js

copyWithin()

25.7M/s

splice()

19.2M/s

View exact numbers

Test name	Executions per second
✓ copyWithin()	25,693,284 Ops/sec
splice()	19,168,448 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)