Run results for: array clone variants

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

slice

816/s

while

192/s

for

192/s

map

139/s

spread

133/s

Array.from

119/s

structuredClone

29/s

View exact numbers

Script Preparation code:

const SIZE = 1_000_000;
const original = Array.from({length: SIZE}, (_, i) => i);

Tests:

spread
const copy = [...original];
slice
const copy = original.slice();
Array.from
const copy = Array.from(original);
map
const copy = original.map((x) => x);
for
const copy = []; for (let i = 0; i < original.length; i++) { copy[i] = original[i]; }
while
const copy = []; let i = 0; while (i < original.length) { copy[i] = original[i]; i++; }
structuredClone
const copy = structuredClone(original);