frootloops

def sum(a : Int32, b : Int32)
  a + b
end

sum(1, 1) # 2 : Int32

frootloops

begin
  raise "OH NO!"
rescue
  puts "Rescued!"
end

frootloops

value = "Hello world"
index = value.index("a") # (Int32 | Nil)
  
if index 
  # index is not a nil
end

frootloops

if a.is_a?(Number)
  a + 1
end

frootloops

if 1 + 2 == 3
  a = 1
else
  a = "hello"
end

a # : Int32 | String

frootloops

def one
  1
end

proc = ->one
proc.call #=> 1

frootloops

# This is a comment
nil # is used to represent the absence of a value

true  # A Bool that is true
false # A Bool that is false

10    # Int32
1.0   # Float64

'a' # a Char represents a Unicode code point. It occupies 32 bits.

frootloops

protocol TrackingEventType {
    var identifier: String { get }
    var properties: [String: Any] { get }
}

protocol TrackingProviderType {
    func track(event: TrackingEventType)
    func associate(with user: User)
    func disassociateUser()
    func setup()

frootloops

App.trackingClient = TestTrackingClient()
let productViewController = ProductViewController(product: product)
productViewController.buy()
App.trackingClient.events[0] == UserEvents.bought(product: product)

frootloops

class TestTrackingClient: TrackingClientType {
    var providers = [TrackingProviderType]()
    var events = [TrackingEventType]()

    func track(event: TrackingEventType) {
        events.append(event)
    }
}