MeasureThat.net

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

Go to the benchmark
Run details:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.71 Safari/537.36
Chrome 94
Linux
Desktop
3 years ago
Test name Executions per second
for..of 3579747.5 Ops/sec
for..in 256972.9 Ops/sec
for 201042.4 Ops/sec
foreach 3472282.8 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));