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

I think this is the most efficient solution if you know your string is a multiple of chunk size

def chunk(string, size)
    (string.length / size).times.collect { |i| string[i * size, size] }
end

and for parts

def parts(string, count)
    size = string.length / count
    count.times.collect { |i| string[i * size, size] }
end