Run results for: JavaScript Large Array Copy

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Windows

Device Platform: Desktop

Date tested: one month ago

Script Preparation code:

var arrayToCopy = Array.from({ length: 1000 * 1000 }, _ => "Hello");
var shallowCopy = [];

Tests:

Array.concat
shallowCopy = arrayToCopy.concat();
Slice with begin argument
shallowCopy = arrayToCopy.slice(0);
Array.from
shallowCopy = Array.from(arrayToCopy);
Array.toSpliced
shallowCopy = arrayToCopy.toSpliced();
Spread operator
shallowCopy = [...arrayToCopy];
For loop
for (let i = 0; i < arrayToCopy.length; i++) { shallowCopy.push(arrayToCopy[i]); }