Run results for: Array filter vs. for loop - with for in

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/117.0.5938.117 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 117

Operating system: iOS 16.6

Device Platform: Mobile

Date tested: 7 months ago

Test name	Executions per second
Filter	2660077.0 Ops/sec
For	498518.9 Ops/sec
For 2	498417.8 Ops/sec
For in	368294.7 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]); }

Run results for: Array filter vs. for loop - with for in

Filter

For

For 2

For in