MeasureThat.net

Run results for: Array filter vs. for loop - with for in 2

This version declares i once before

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Run details:
Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1
Mobile Safari 13
iOS 13.2.3
Mobile
5 years ago
Test name Executions per second
Filter 3975155.5 Ops/sec
For 493023.4 Ops/sec
For 2 495922.1 Ops/sec
For in 509526.1 Ops/sec
Script Preparation code:
AخA
 
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]);
    }