Run results for: Spread first vs map first then Array.from

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:136.0) Gecko/20100101 Firefox/136.0

Browser: Firefox 136

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Spread first then map

23/s

Map first then Array.from

13/s

View exact numbers

Test name	Executions per second
✓ Spread first then map	23 Ops/sec
Map first then Array.from	13 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

let foo = new Map();
for (let i = 0; i < 1_000_000; i++) {
  foo.set(i, i % 8);
}

Tests:

Spread first then map
[...foo.entries()].map(([i, iMod8]) => [i, iMod8.toString()])
Map first then Array.from
Array.from(foo.entries().map(([i, iMod8]) => [i, iMod8.toString()]))