Run results for: Array.from with mapper vs Array.fill

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser: Chrome 132

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
from with mapper	71.6 Ops/sec
fill twice	2763.2 Ops/sec

Tests:

from with mapper
let n = 10000, length = 50 const result = [] const lengthObj = {length:length} const mapper = (_, i) => i < 25 ? 0 : 1 for (let i = 0; i < n; ++i) { result.push(Array.from(lengthObj, mapper)); }
fill twice
let n = 10000, length = 50 const result = [] for (let i = 0; i < n; ++i) { result.push(Array(5).fill(0, 0, 25).fill(1, 25)); }