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Reduce vs Map vs FromEntries vs for loop
(version: 1)
Original benchmark was unfairly forcing the for loop to be slower through variable declaration and destructuring.
Comparing performance of:
reduce vs map + fromEntries vs for loop
Created:
one year ago
by:
Guest
Go to the latest result
Script Preparation code:
const data = Array.from(Array(10000).keys()); const dataObject = Object.entries(data)
Tests:
reduce
dataObject.reduce((acc, [k, v]) => { acc[k] = v.toString(); return acc; }, {});
map + fromEntries
Object.fromEntries(dataObject.map(([k, v]) => ([k, v.toString()])));
for loop
const hashLookup = {} for (let i = 0; i < dataObject.length; i++) { hashLookup[i] = dataObject[i]; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
reduce
map + fromEntries
for loop
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) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36
Browser/OS:
Chrome 137 on Windows
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=611137" width="100%" height="500px"></iframe>
for loop
12K/s
reduce
7K/s
map + fromEntries
2K/s
View exact numbers
Test name
Executions per second
✓
for loop
12,313 Ops/sec
reduce
7,000 Ops/sec
map + fromEntries
1,693 Ops/sec
Related benchmarks
Reduce vs Map+FromEntries vs for loop
Reduce vs Map+FromEntries vs for loop vs forEach
Object.fromEntries vs reduce vs Map - Corrected fromEntries
Reduce vs Map+FromEntries vs for loop vs forof loop
Reduce vs Map+FromEntries vs for loop vs forof loop vd
Reduce vs Map + FromEntries vs for loop vs map
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