Benchmark: Reduce vs Map+FromEntries vs for loop vs forof loop

Script Preparation code:

var data = Array.from(Array(10000).keys());

Tests:

reduce mutating acc
Object.entries(data).reduce((acc, [k, v]) => { acc[k] = v.toString(); return acc; }, {});
map + fromEntries
Object.fromEntries(Object.entries(data).map(([k, v]) => ([k, v.toString()])));
for loop
const dataObject = Object.entries(data) const acc = {} for (let i = 0; i < dataObject.length; i++) { const [k, v] = dataObject[i]; acc[k] = v.toString() }
forof loop
const dataObject = Object.entries(data) const acc = {} for (const [k,v] of dataObject) { acc[k] = v.toString() }
forin loop
const dataObject = Object.entries(data) const acc = {} for (const property in data) { if (data.hasOwnProperty(property)){ acc[property] = data[property].toString(); } }
reduce without mutating acc
Object.entries(data).reduce((acc, [k, v]) => { return { ...acc, [k]: v.toString() }; }, {});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce mutating acc
map + fromEntries
for loop
forof loop
forin loop
reduce without mutating acc

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Mac OS X 10.15.7

View result in a separate tab

for loop

2K/s

forof loop

2K/s

reduce mutating acc

1K/s

map + fromEntries

750/s

forin loop

503/s

reduce without mutating acc

43/s

View exact numbers

Test name	Executions per second
✓ for loop	1,595 Ops/sec
forof loop	1,552 Ops/sec
reduce mutating acc	1,336 Ops/sec
map + fromEntries	750 Ops/sec
forin loop	503 Ops/sec
reduce without mutating acc	43 Ops/sec

Reduce vs Map+FromEntries vs for loop vs forof loop (version: 0) Benchmark.js

Comparing performance of: `reduce mutating acc vs map + fromEntries vs for loop vs forof loop vs forin loop vs reduce without mutating acc`

Created: 2 years ago by: Guest

Go to the latest result

reduce mutating acc

map + fromEntries

for loop

forof loop

forin loop

reduce without mutating acc

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Reduce vs Map+FromEntries vs for loop vs forof loop (version: 0) Benchmark.js

Comparing performance of: reduce mutating acc vs map + fromEntries vs for loop vs forof loop vs forin loop vs reduce without mutating acc

Created: 2 years ago by: Guest

Go to the latest result

reduce mutating acc

map + fromEntries

for loop

forof loop

forin loop

reduce without mutating acc

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `reduce mutating acc vs map + fromEntries vs for loop vs forof loop vs forin loop vs reduce without mutating acc`