Run results for: 2D nested array of numbers deep copy

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Browser: Chrome 116

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Script Preparation code:

var N = 1000,
    arr = Array(N).fill(0).map(item => Array(N).fill(0).map(x => Math.random()));

Tests:

for spread
const newArr = []; for(let i = 0; i < N; i += 1) { newArr[i] = [...arr[i]]; }
map map
return arr.map(item => item.map(x => x));
map spread
return arr.map(item => [...item]);
map Array.from
return arr.map(item => Array.from(item));
map slice
return arr.map(item => item.slice());
map concat
return arr.map(item => [].concat(item));
for map
const newArr = []; for(let i = 0; i < N; i += 1) { newArr[i] = arr[i].map(x => x); } return newArr;