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Run results for:
Object filtering by key
Compares different way to filter object
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<iframe src="https://measurethat.net/Embed?id=591313" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0
Browser:
Firefox 136
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
for-of (Map)
1862.6M/s
for-of (object)
1851.8M/s
Reduce (object)
2K/s
Reduce (Map)
2K/s
View exact numbers
Test name
Executions per second
✓
for-of (Map)
1,862,645,120 Ops/sec
for-of (object)
1,851,825,536 Ops/sec
Reduce (object)
2,439 Ops/sec
Reduce (Map)
1,638 Ops/sec
Script Preparation code:
var data = { ...Array.from(Array(10000).keys()) };
Tests:
Reduce (object)
Object.keys(data) .filter(key => Number(key) % 2 === 0) .reduce((acc, key) => { acc[key] = data[key]; return acc; }, {});
Reduce (Map)
Object.keys(data) .filter(key => Number(key) % 2 === 0) .reduce((acc, key) => { acc.set(key, data[key]); return acc; }, new Map());
for-of (object)
const filter = (val) => { const result = {} for (const key in val) { if (Number(key) % 2 === 0) { continue; } result[key] = val[key]; } return result; };
for-of (Map)
const filter = (val) => { const result = new Map(); for (const key in val) { if (Number(key) % 2 === 0) { continue; } result.set(key, val[key]); } return Object.fromEntries(result.entries()); };