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let thisQuiz: String!

var thisQuiz: String!

println (“thisQuiz”)

iOS platform only

OS X platform only

both iOS and OS X

println ("declare: var")

var thisOneQuestion: NSString?

let whoLetTheDogsOut: String?

Double

Int

String

println ("Touch Detected")

println ("\(Touch Detected)")

printf ( "Touch Detected" )

println ("Our Customer's name is: \(customerName)")

println ("Our Customer's name is: customerName")

println ("Our Customer's name is: John Smith")

// this is a comment

/* this is a comment */

/*this is a comment
/* also a comment */
more comment */

no

yes

var myVar: Bool = true

var myVar: Int!

var myVar: String?

var myVar: Int = 1

var optionalVar: Int!

var optionalVar: String?

var optionalVar:String!

To check if the optional variable myVar contains a value.

To force unwrap myVar and give it a value of 'nil' .

To see if myVar is equal to 0 and if yes – print something.

"Apples and Oranges"

"Apples" + " and Oranges"

"and OrangesApples"