Benchmark: JavaScript Array Copy 3

Script Preparation code:

var arrayToCopy = new Array(1000).fill(5);
var shallowCopy = [];

Tests:

Array.concat
shallowCopy = arrayToCopy.concat();
Array.slice
shallowCopy = arrayToCopy.slice();
For loop no push
var arrayLength = arrayToCopy.length; shallowCopy.length = arrayLength; for (let i = 0; i < arrayLength; ++i) { shallowCopy[i] = arrayToCopy[i]; }
For loop no push, prefill
var arrayLength = arrayToCopy.length; for (let i = 0; i < arrayLength; ++i) { shallowCopy[i] = arrayToCopy[i]; }

Rendered benchmark preparation results:

Previous results

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36

Browser/OS: Chrome 140 on Mac OS X 10.15.7

Related benchmarks:

JavaScript Array Copy 3 (version: 1)