Selecting the odd or even elements out of an array

Question

I've been asked to write a piece of code that returns the odd elements of an array when a the second argument is true and even elements if it is false. So far I have written one half and I need a method that can select the odd elements.

def odds_and_evens(string, return_odds)
  if return_odds != false
    string.chars.to_a
  end
end

puts odds_and_evens("abcdefgh", true)

Answer 1

If you add this code you have 2 handy methods to select odd or even values from an array

class Array
  def odd_values
    values_at(* each_index.select(&:odd?))
  end
  def even_values
    values_at(* each_index.select(&:even?))
  end
end