Run results for: Initializing array with n undefined items

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0

Browser: Firefox 68

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var n = 100000; // 100k

Tests:

[...Array(n).keys()].map(k => undefined)
[...Array(n).keys()].map(k => undefined);
Array.apply(null, { length: 4 })
Array.apply(null, { length: n });
Array.from
Array.from({ length: n }, () => undefined);
Array(n).fill(undefined)
Array(n).fill(undefined)
for loop push
const arr = []; for (let i = 0; i < n; i++) { arr.push(undefined); }