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Run results for:
for ++i < length vs .forEach(t) vs for..of vs for t = entries[++i] vs for i = 0; ++i in entries vs for ++i in object vs .reduce (entries)
Compare loop performance
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=592497" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Browser:
Chrome 134
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
for i in array,
374/s
for i=0; i in array
257/s
for i < length
253/s
for..of
251/s
for t = array[i]
251/s
.forEach(t)
248/s
.reduce
235/s
View exact numbers
Test name
Executions per second
✓
for i in array,
374 Ops/sec
for i=0; i in array
257 Ops/sec
for i < length
253 Ops/sec
for..of
251 Ops/sec
for t = array[i]
251 Ops/sec
.forEach(t)
248 Ops/sec
.reduce
235 Ops/sec
Script Preparation code:
var object = {}; for (let i = 1; i <= 100000; i++) object[String(i)] = i;
Tests:
for i < length
for (let entries = Object.entries(object), i = -1, length = entries.length; ++i < length;) { const t = entries[i]; window.k = t[0] window.v = t[1]; }
.forEach(t)
const entries = Object.entries(object); entries.forEach(([k, v]) => { window.k = k; window.v = v; });
for..of
const entries = Object.entries(object); for (const [k, v] of entries) { window.k = k; window.v = v; }
for t = array[i]
for (let entries = Object.entries(object), i = -1, t; t = entries[++i]; i) { window.k = t[0]; window.v = t[1]; }
for i=0; i in array
for (let entries = Object.entries(object), i = -1; ++i in entries;) { const t = entries[i]; window.k = t[0]; window.v = t[1]; }
for i in array,
for (const k in object) { window.k = k; window.v = object[k]; }
.reduce
const entries = Object.entries(object) entries.reduce((_, [k, v]) => { window.k = k; window.v = v; });