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Run results for:
Object.fromEntries vs reduce vs Map vs Object.assign vs forEach
Go to the benchmark
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=617262" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:143.0) Gecko/20100101 Firefox/143.0
Browser:
Firefox 143
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
forEach
2K/s
Reduce (reuse object)
2K/s
Map
403/s
Object.fromEntries
196/s
Object.assign
171/s
Reduce (creating temporary objects)
0/s
View exact numbers
Test name
Executions per second
✓
forEach
1,772 Ops/sec
Reduce (reuse object)
1,570 Ops/sec
Map
403 Ops/sec
Object.fromEntries
196 Ops/sec
Object.assign
171 Ops/sec
Reduce (creating temporary objects)
0 Ops/sec
Script Preparation code:
var data = { ...Array.from(Array(10000).keys()) };
Tests:
Object.fromEntries
Object.fromEntries(Object.entries(data).map((key, value) => [key, value]));
Reduce (reuse object)
Object.entries(data).reduce((acc, [k, v]) => { acc[k] = v.toString(); return acc; }, {});
Reduce (creating temporary objects)
Object.entries(data).reduce((acc, [k, v]) => ({ ...acc, [k]: v.toString() }), {});
Map
Object.entries(data).reduce((acc, [k, v]) => { acc.set(k, v.toString()) return acc; }, new Map());
forEach
const result = {}; Object.keys(data).forEach((key) => { result[key] = data[key].toString(); });
Object.assign
Object.assign( {}, ...Object.entries(data).map(([key, value]) => ({ [key]: value })) );