JavaScript - Nuances of myArray.forEach vs for loop

Question

I\'ve seen plenty of questions that suggest using:

for (var i = 0; i < myArray.length; i++){ /* ... */ }

instead of:

for         


        

Answer 1

You can use your custom foreach function which will perform much better then Array.forEach

You should add this once to your code. This will add new function to the Array.

function foreach(fn) {
    var arr = this;
    var len = arr.length;
    for(var i=0; i

Then you can use it anywhere like the Array.forEach

[1,2,3].customForEach(function(val, i){

});

The only difference it is 3 times faster. https://jsperf.com/native-arr-foreach-vs-custom-foreach

UPDATE: In new Chrome version the performance of .forEach() was improved. However, the solution can give the additional performance in other browsers.