Learn Ruby the Hard Way: A Simple and Idiomatic Introduction to the Imaginative World of Computational Thinking with Code, Third Edition

Exercise 21. Functions Can Return Something

You have been using the = character to name variables and set them to numbers or strings. We’re now going to blow your mind again by showing you how to use = and a new Ruby word return to set variables to be a value from a function. There will be one thing to pay close attention to, but first type this in:

ex21.rb

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 1    def add(a, b)  2      puts "ADDING #{a} + #{b}"  3      return a + b  4    end  5  6    def subtract(a, b)  7      puts "SUBTRACTING #{a} - #{b}"  8      return a - b  9    end 10 11    def multiply(a, b) 12      puts "MULTIPLYING #{a} * #{b}" 13      return a * b 14    end 15 16    def divide(a, b) 17      puts "DIVIDING #{a} / #{b}" 18      return a ...