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 (Macintosh; Intel Mac OS X 10_11_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36
Chrome 52
Mac OS X 10.11.1
Other
8 years ago
Test name Executions per second
Filter 707464.8 Ops/sec
For 109208.8 Ops/sec
For 2 110368.8 Ops/sec
For in 156093.8 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]);
    }