Run results for: Object.fromEntries vs for...of vs for (C style)

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36

Browser: Chrome 149

Operating system: Linux

Device Platform: Desktop

Date tested: 2 months ago

for (C style)

1K/s

for...of

1K/s

Object.fromEntries

790/s

View exact numbers

Script Preparation code:

const data = Array(10000);
for (let i=0; i<data.length; i++) {
  data[i] = i;
}

Tests:

Object.fromEntries
const a = Object.fromEntries(data.map((idx) => ["id-"+idx, idx]));
for...of
const a = {} for (const idx of data) { a["id-"+idx] = idx; }
for (C style)
const a = {} for (let i=0; i<data.length; i++) { const idx = data[i]; a["id-"+idx] = idx; }
forEach
const a = {} data.forEach(idx => a["id-"+idx] = idx);