SWIFT DOWNCAST INITIALIZER CODE

Explicitly make instances of the desired type.

let aString : String = 'A string' let aDouble : Double = 0 // Values are never implicitly converted to another type. To explicitly declare the type, write it after the variable name, // separated by a colon. let theAnswer = 42 var theQuestion = 'What is the Answer?' theQuestion = 'How many roads must a man walk down?' theQuestion = 'What is six by nine?' // Atttempting to reassign a constant throws a compile-time error //theAnswer = 54 // Both variables and constants can be declared before they are given a value, // but must be given a value before they are used let someConstant : Int var someVariable : String // These lines will throw errors: //print(someConstant) //print(someVariable) someConstant = 0 someVariable = '0' // These lines are now valid: print ( someConstant ) print ( someVariable ) // As you can see above, variable types are automatically inferred.

print ( 'Hello, world' ) // // MARK: - Variables // //Use `let` to declare a constant and `var` to declare a variable.

SWIFT DOWNCAST INITIALIZER CODE

import a module import Foundation // Single-line comments are prefixed with // // Multi-line comments start with /* and end with */ /* Nested multiline comments /* ARE */ allowed */ // Xcode supports landmarks to annotate your code and lists them in the jump bar // MARK: Section mark // MARK: - Section mark with a separator line // TODO: Do something soon // FIXME: Fix this code // MARK: Hello, World // From Swift 3 on, to print, just use the `print` method.

Swift downcast initializer