Benchmark: Object filtering by key

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()); };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Reduce (object)
Reduce (Map)
for-of (object)
for-of (Map)

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0

Browser/OS: Firefox 136 on Windows

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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

Object filtering by key (version: 1)

Compares different way to filter object

Comparing performance of: `Reduce (object) vs Reduce (Map) vs for-of (object) vs for-of (Map)`

Created: one year ago by: Guest

Go to the latest result

Reduce (object)

Reduce (Map)

for-of (object)

for-of (Map)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Object filtering by key (version: 1)

Compares different way to filter object

Comparing performance of: Reduce (object) vs Reduce (Map) vs for-of (object) vs for-of (Map)

Created: one year ago by: Guest

Go to the latest result

Reduce (object)

Reduce (Map)

for-of (object)

for-of (Map)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Reduce (object) vs Reduce (Map) vs for-of (object) vs for-of (Map)`