douglogue

toppings = %w(pepperoni mushroom bacon pineapple)

def pizza(toppings)
  pizza.map do |topping|
    puts "I love #{topping} pizza!"
  end
end

douglogue

[
  "I love pepperoni pizza!",
  "I love mushroom pizza!",
  "I love bacon pizza!",
  "I love pineapple pizza!"
]

douglogue

def pizza(toppings)
  my_statements = []
  toppings.each do |topping|
    my_statements << "I love #{topping} pizza!"
  end
  my_statements
end

douglogue

["pepperoni", "mushroom", "bacon", "pineapple"]

douglogue

I love pepperoni pizza!
I love mushroom pizza!
I love bacon pizza!
I love pineapple pizza!

douglogue

toppings = %w(pepperoni mushroom bacon pineapple)

def pizza(toppings)
  toppings.each do |topping|
    puts "I love #{topping} pizza!"
  end
end

douglogue

var costume: String? = "Werewolf"
println(costume) // Optional("Werewolf")

costume = costume! + " dressed as Michael J Fox" 
println(costume) // Optional("Werewolf dressed as Michael J Fox")

douglogue

var costume: String? = "Werewolf"
println(costume) // Optional("Werewolf")

costume = costume + " dressed as Michael J Fox" // Compiler Error

if let something = costume {
// The value is not nil, use it with confidence
something = something + " dressed as Michael J Fox"
println(something) // "Werewolf dressed as Michael J Fox"
} else {

douglogue

NSString *costume = @"Dracula";

// ...

if (costume == nil) {
// Do something for this plain clothes guest
} else {
// Do something else for this costumed guest
}

douglogue

// Non-optional vars

var mutableBeverage = "Leffe"
println(mutableBeverage) // "Leffe"

mutableBeverage = "Bud"
println(mutableBeverage) // "Bud"

mutableBeverage = mutableBeverage + "weiser"
println(mutableBeverage) // "Budweiser"