Compares a classic indexed for loop against Array.prototype.forEach for summing an array.
var iterations = 20000;
var arr=Array.from({length:1000},function(_,i){return i});var t=0;for(var i=0;i<arr.length;i++){t+=arr[i]}var t=0;arr.forEach(function(n){t+=n});var t=0;for(var i=0;i<arr.length;i++){t+=arr[i]}var t=0;arr.forEach(function(n){t+=n});var t=0;for(var i=0;i<arr.length;i++){t+=arr[i]}var t=0;arr.forEach(function(n){t+=n});| Browser | Snippet A | Snippet B | Winner |
|---|---|---|---|
1st  Microsoft Edge153.0.4234.32 | 8.40 ms | 32.30 ms | Snippet A3.85× faster |
2nd  Firefox156.0 | 15.00 ms | 95.00 ms | Snippet A6.33× faster |
3rd  Safari26.6.2 | 23.00 ms | 109.00 ms | Snippet A4.74× faster |
4th  Chrome153.0.8010.53 | 30.00 ms | 44.80 ms | Snippet A1.49× faster |
Median of 5 trials × 20,000 iterations per snippet.