Benchmark: Initializing array with map function

Initializing array with map function (version: 1)

Script Preparation code:

var n = 100000; // 100k
function filler(v, i) {
    return i ** 2;
}

Tests:

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

Rendered benchmark preparation results:

Previous results

Test case name	Result
[...Array(n).keys()].map(filler)
Array.apply(null, { length: 4 }).map(filler)
Array.from
Array(n).fill(undefined).map(filler)
for loop push

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser/OS: Firefox 133 on Linux

for loop push

436/s

Array.from

357/s

Array(n).fill(undefined).map(filler)

141/s

[...Array(n).keys()].map(filler)

112/s

Array.apply(null, { length: 4 }).map(filler)

69/s

View exact numbers

Test name	Executions per second
✓ for loop push	436 Ops/sec
Array.from	357 Ops/sec
Array(n).fill(undefined).map(filler)	141 Ops/sec
[...Array(n).keys()].map(filler)	112 Ops/sec
Array.apply(null, { length: 4 }).map(filler)	69 Ops/sec