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Run results for:
Array filter vs. for loop - with for in
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<iframe src="https://measurethat.net/Embed?id=565803" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Filter
8.4M/s
For
1.1M/s
For 2
1.1M/s
For in
934K/s
View exact numbers
Test name
Executions per second
✓
Filter
8,436,999 Ops/sec
For
1,093,386 Ops/sec
For 2
1,057,241 Ops/sec
For in
934,234 Ops/sec
Script Preparation code:
var arr = [1,2,3,4,5,6,7,8,9,0], farr;
Tests:
Filter
farr = arr.filter(function(item) { return (item>4); });
For
for (var i=0,len=arr.length;i<len;i++) { if (arr[i]<5) continue; farr.push(arr[i]); }
For 2
for (var i=0,len=arr.length;i<len;i++) { if (arr[i]>4) farr.push(arr[i]); }
For in
for (var i in arr) { if (arr[i]>4) farr.push(arr[i]); }