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# A function is the most basic way we have to reuse code in our programs. 
# We can define and call a function as easily as:

def greet(name)
  puts "Hi, #{name}!"
end

greet("Rafa")
greet("Xavi")
greet("Isra")
greet("Fernando")


# Also functions can have return values:

def square(number)
  return number * number
end

def multiply(a,b)
  return a * b
end

puts(square(22))
puts(square(1))
puts(square(10))

puts(multiply(3,2))
puts(multiply(10,3))


# Addition returns the sum of the two numbers
puts 10 + 13

# Similarly, a function can return a result of a custom operation.
# Take a string's reverse function, for example:
puts "desserts".reverse


# Another cool thing you can do in Ruby that is not as easy to do in other 
# languages is returning more than one value from a function call:


def power_formula(base_chemical)
  sugar = base_chemical * 500
  spice = sugar / 1000
  everything_nice = sugar / 100
  return sugar, spice, everything_nice
end


chemical_x = 10000
blossom, buttercup, bubbles = power_formula(chemical_x)

puts "Using the value #{chemical_x} as our base chemical"
puts "We get values of #{blossom} for blossom, #{buttercup} for buttercup, and #{bubbles} for bubbles."