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:
Opera/9.80 (Windows NT 6.2; WOW64) Presto/2.12.388 Version/12.18
Opera 12
Windows 8
Desktop
5 years ago
Test name Executions per second
Filter 530452.7 Ops/sec
For 304109.1 Ops/sec
For 2 299415.7 Ops/sec
For in 283285.6 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]);
    }