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  Firefox159.0 | 7.00 ms | 72.00 ms | Snippet A10.29× faster |
2nd  Microsoft Edge156.0.4314.42 | 19.30 ms | 32.10 ms | Snippet A1.66× faster |
3rd  Chrome156.0.8078.80 | 20.00 ms | 42.90 ms | Snippet A2.15× faster |
4th  Safari26.6.2 | 23.00 ms | 109.00 ms | Snippet A4.74× faster |
Median of 5 trials × 20,000 iterations per snippet.
ChromeFirefoxMicrosoft EdgeSafari