MeasureThat.net

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

This version declares i once before

Go to the benchmark
Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0
Firefox 72
Windows
Desktop
5 years ago
Test name Executions per second
Filter 19504744.0 Ops/sec
For 1448802.2 Ops/sec
For 2 1398007.5 Ops/sec
For in 467245.3 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]);
    }