Run results for: Array.from vs Array.fill (with correct length)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0

Browser: Firefox 134

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
from	166.5 Ops/sec
fill	112.0 Ops/sec

Tests:

from
let n = 10000, length = 100 let dontOptimizeMeBro = 0; for (let i = 0; i < n; ++i) { dontOptimizeMeBro += Array.from({length:length}).map((_, i) => i + 1).at(-1); } console.log(dontOptimizeMeBro)
fill
let n = 10000, length = 100 let dontOptimizeMeBro = 0; for (let i = 0; i < n; ++i) { dontOptimizeMeBro += Array(length).fill(0).map(i => i + 1).at(-1); } console.log(dontOptimizeMeBro)