JS for iterator caching

iterator-caching.js

// no caching of iteration size
for (var i=0; i<myArray.length; i++) {}

// caching of iteration size - ugly version
var length = myArray.length;
for (var i=0; i<length; i++) {}

// caching of iteration size - nice version
for (var i=0, len=myArray.length, i< len; i++) {}