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  Safari26.5.2 | 9.00 ms | 32.00 ms | Snippet A3.56× faster |
2nd  Firefox154.0 | 12.00 ms | 91.00 ms | Snippet A7.58× faster |
3rd  Chrome152.0.7977.65 | 19.60 ms | 55.40 ms | Snippet A2.83× faster |
4th  Microsoft Edge152.0.4191.53 | 82.60 ms | 150.40 ms | Snippet A1.82× faster |
Median of 5 trials × 20,000 iterations per snippet.