Intro to Ruby - 06 - Methods Addendum

001_multiple_arguments.rb

## Basic method with multiple arguments
def add_numbers(a, b)
  a + b
end

add_numbers(5, 4) # => 9

002_without_parentheses.rb

def square(number)
  number * number
end

## Here we call the square method without
## parentheses and Ruby handles it fine.
square 8 # => 64

## This even works with multiple arguments.
## Using the add_number method created above.

add_number 5, 4 # => 9

## You want to be careful when not using parentheses
## and you should always use them when you're calling
## a method on the result of another method

s = "Michael's got a string"
s.sub("string", "guitar").downcase

## If you do s.sub 'string', 'guitar'.downcase
## it won't work as you might expect because Ruby
## wouldn't know how to parse it properly.