Run results for: Array(n).fill(char) vs Array.from({ length: n }, _ => char) vs manual loop

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Array(n).fill(str)

239K/s

loop

98K/s

Array.from({ length: n }, _ => str)

66K/s

View exact numbers

Script Preparation code:

var str = "string";
var n = 1000;

Tests:

Array(n).fill(str)
var res = Array(n).fill(str)
Array.from({ length: n }, _ => str)
var res = Array.from({ length: n }, _ => str)
loop
var res = []; for (var i = 0; i < n; ++i) { res.push(str) }