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

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Run details:
Mozilla/5.0 (iPhone; CPU iPhone OS 17_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1.1 Mobile/15E148 Safari/604.1
Mobile Safari 17
iOS 17.1.1
Mobile
one year ago
Test name Executions per second
Filter 3637624.2 Ops/sec
For 587785.8 Ops/sec
For 2 591467.4 Ops/sec
For in 422262.9 Ops/sec
Script Preparation code:
AخA
 
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]);
    }