MeasureThat.net

Run results for: for..of vs for simple vs for..in

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:81.0) Gecko/20100101 Firefox/81.0
Firefox 81
Windows
Desktop
4 years ago
Test name Executions per second
for..of 3569295.8 Ops/sec
for..in 295744.7 Ops/sec
for 3694988.2 Ops/sec
foreach 4212116.5 Ops/sec
Script Preparation code:
AخA
 
var arr = [12342, 342, 3423, 432, 432, 423, 43, 3, 1, 321, 323, 1, 31, 31, 31, 231, 31, 31];
Tests:

  • for..of

     
    const narr = [];
    for(const item of arr){
      narr.push(item)
    }

  • for..in

     
    const narr = [];
    for(const item in arr){
      narr.push(arr[item])
    }

  • for

     
    const narr = [];
    for(let i=0; i<arr.length; i++){
      narr.push(arr[i])
    }

  • foreach

     
    const narr = [];
    arr.forEach( e => narr.push(e));