How to sort an array based on the length of each element?

Question

I have an array like this:

arr = []
arr[0] = \"ab\"
arr[1] = \"abcdefgh\"
arr[2] = \"abcd\"

After sorting, the output array should be:

Answer 1

I adapted @shareef's answer to make it concise. I use,

.sort(function(arg1, arg2) { return arg1.length - arg2.length })