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Run results for:
Array filter vs. for loop and for in
This version declares i once before
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<iframe src="https://measurethat.net/Embed?id=614763" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:138.0) Gecko/20100101 Firefox/138.0
Browser:
Firefox 138
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
9 months ago
Test name
Executions per second
Filter
20780782.0 Ops/sec
For
19695168.0 Ops/sec
For in
2731735.2 Ops/sec
Script Preparation code:
var arr = [1,2,3,4,null,5,6,"7",8,{a:2},0], farr=[], i,len;
Tests:
Filter
farr= arr.filter(function(item) { return (item); });
For
farr = []; for (i=0,len=arr.length;i<len;i++) { farr.push(arr[i]); }
For in
farr = []; for(i in arr) { farr.push(arr[i]); }