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Run results for:
Reduce vs Map + FromEntries vs for loop vs map
Original benchmark was unfairly forcing the for loop to be slower through variable declaration and destructuring.
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<iframe src="https://measurethat.net/Embed?id=611140" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36
Browser:
Chrome 137
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
for loop
12K/s
map
11K/s
reduce
7K/s
map + fromEntries
2K/s
View exact numbers
Test name
Executions per second
✓
for loop
12,305 Ops/sec
map
10,986 Ops/sec
reduce
7,380 Ops/sec
map + fromEntries
1,694 Ops/sec
Script Preparation code:
const data = Array.from(Array(10000).keys()); const dataObject = Object.entries(data)
Tests:
reduce
dataObject.reduce((acc, [k, v]) => { acc[k] = v.toString(); return acc; }, {});
map + fromEntries
Object.fromEntries(dataObject.map(([k, v]) => ([k, v.toString()])));
for loop
const hashLookup = {} for (let i = 0; i < dataObject.length; i++) { hashLookup[i] = dataObject[i]; }
map
const hashLookup = {}; (dataObject ?? []).map((value, index) => hashLookup[index] = value);