How to split a string in half, into two variables, in one statement?

Question

I want to split str in half and assign each half to first and second

Like this pseudo code example:

first,second = str.split( middle )

Answer 1

class String
  def halves
    chars.each_slice(size / 2).map(&:join)
  end
end

Will work, but you will need to adjust to how you want to handle odd-sized strings.

Or in-line: first, second = str.chars.each_slice(str.length / 2).map(&:join)

Answer 2

first,second = str.partition(/.{#{str.size/2}}/)[1,2]

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Explanation

You can use partition. Using a regex pattern to look for X amount of characters (in this case str.size / 2).

Partition returns three elements; head, match, and tail. Because we are matching on any character, the head will always be a blank string. So we only care about the match and tail hence [1,2]