module5.md

Learning Goals

1. Understand what a function / method is
2. Learn how to define a method with and without a return value

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Function

• A function is a block of organized, reusable code that is used to perform a single, related action
• they can have inputs (aka arguments) and outputs

f(x) = 2x + 5

Note:

Go over what would be considered the input + output

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Anatomy of a Method / Function

def f(x) # def, name of method, arguments for method
  return 2*x + 5
end

Note:

Tell them in Ruby, methods + functions are interchangeable terms

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Return Statement

• The value that follows the return is the output of a function
• Not all functions need to return something, but typically do

Note:

go over what the return statement does and implicit returns

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CODE

1. Define a method that takes two integer values as arguments and returns the sum of the values.

2. Define a method that takes an array of integer values and returns the sum of those integer values.

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Review

• What a method is
• Anatomy of a method
• return statement

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