What is the best way to chop a string into chunks of a given length in Ruby?

Question

I have been looking for an elegant and efficient way to chunk a string into substrings of a given length in Ruby.

So far, the best I could come up with is this:

Answer 1

Are there some other constraints you have in mind? Otherwise I'd be awfully tempted to do something simple like

[0..10].each {
   str[(i*w),w]
}