What's the best way to loop through a set of elements in JavaScript?

Question

In the past and with most my current projects I tend to use a for loop like this:

var elements = document.getElementsByTagName(\'div\');
for (var i=0; i

        

Answer 1

I prefer the for loop as it's more readable. Looping from length to 0 would be more efficient than looping from 0 to length. And using a reversed while loop is more efficient than a foor loop as you said. I don't have the link to the page with comparison results anymore but I remember that the difference varied on different browsers. For some browser the reversed while loop was twice as fast. However it makes no difference if you're looping "small" arrays. In your example case the length of elements will be "small"