Swift: Optionals Part 2

optionals_part2.swift

// Declare an optional value
var name: String? = "Roman"

// Optional chaining
name?.characters.count

if name != nil {
  // Force unwrap
  name!.characters.count
}

// Optional binding
if let unwrappedName = name {
  unwrappedName.characters.count
}

// Variable shadowing
if let name = name {
  name.characters.count
}