Benchmark: Object.fromEntries vs reduce vs Map vs for loop

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());
for loop (reuse object)
const acc = {}; for (const [k, v] of Object.entries(data)) { acc[k] = v.toString(); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.fromEntries
Reduce (reuse object)
Reduce (creating temporary objects)
Map
for loop (reuse object)

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36

Browser/OS: Chrome 146 on Windows

View result in a separate tab

for loop (reuse object)

2K/s

Reduce (reuse object)

2K/s

Map

1K/s

Object.fromEntries

248/s

Reduce (creating temporary objects)

84/s

View exact numbers

Test name	Executions per second
✓ for loop (reuse object)	2,279 Ops/sec
Reduce (reuse object)	2,060 Ops/sec
Map	1,090 Ops/sec
Object.fromEntries	248 Ops/sec
Reduce (creating temporary objects)	84 Ops/sec

Object.fromEntries vs reduce vs Map vs for loop (version: 1)

Comparing performance of: `Object.fromEntries vs Reduce (reuse object) vs Reduce (creating temporary objects) vs Map vs for loop (reuse object)`

Created: 10 months ago by: Guest

Go to the latest result

Object.fromEntries

Reduce (reuse object)

Reduce (creating temporary objects)

Map

for loop (reuse object)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Object.fromEntries vs reduce vs Map vs for loop (version: 1)

Comparing performance of: Object.fromEntries vs Reduce (reuse object) vs Reduce (creating temporary objects) vs Map vs for loop (reuse object)

Created: 10 months ago by: Guest

Go to the latest result

Object.fromEntries

Reduce (reuse object)

Reduce (creating temporary objects)

Map

for loop (reuse object)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Object.fromEntries vs Reduce (reuse object) vs Reduce (creating temporary objects) vs Map vs for loop (reuse object)`