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Run results for:
Array loop: forEach vs for vs map vs for of entries
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Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:148.0) Gecko/20100101 Firefox/148.0
Browser:
Firefox 148
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
2 months ago
Test name
Executions per second
forEach
244226.1 Ops/sec
for
1744565.9 Ops/sec
map
192246.5 Ops/sec
for of entries
117583.5 Ops/sec
Script Preparation code:
var arr = []; for (var i = 0; i < 1000; i++) { arr[i] = i; } function someFn(x, i) { return x * i * 3 * 8; }
Tests:
forEach
arr.forEach(someFn)
for
for (var i = 0, len = arr.length; i < len; i++) { someFn(arr[i], i); }
map
arr.map(someFn)
for of entries
for (const [x, i] of arr.entries()) { someFn(x, i); }