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Run results for:
Array filter vs. for loop - with for in 2
This version declares i once before
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<iframe src="https://measurethat.net/Embed?id=504420" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 16_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 16
Operating system:
iOS 16.1.1
Device Platform:
Mobile
Date tested:
2 years ago
Test name
Executions per second
Filter
4010179.5 Ops/sec
For
403908.9 Ops/sec
For 2
460714.0 Ops/sec
For in
439399.5 Ops/sec
Script Preparation code:
var arr = [1,2,3,4,5,6,7,8,9,0], farr, i,len;
Tests:
Filter
farr = arr.filter(function(item) { return (item>4); });
For
for (i=0,len=arr.length;i<len;i++) { if (arr[i]<5) continue; farr.push(arr[i]); }
For 2
for (i=0,len=arr.length;i<len;i++) { if (arr[i]>4) farr.push(arr[i]); }
For in
for (i in arr) { if (arr[i]>4) farr.push(arr[i]); }