Tuple

Introduzione

Avvertenza

Esempio

let http404Error = (404, "Not Found")
// http404Error is of type (Int, String), 
// and equals (404, "Not Found")

let coordinates = (26, 45)
let datas = (1,2,3,4)
// The values ​​in the tuple don't have to be just 2. 
// A group can be created from more than one number of values.

Destrutturazione

let http404Error = (404, "Not Found")

let (statusCode, statusMessage) = http404Error
// In the example below, 
//String concatenation feature is seen.
print("The status code is \(statusCode)")
// Prints "The status code is 404"
print("The status message is \(statusMessage)")
// Prints "The status message is Not Found"

Operatore underscore

let http404Error = (404, "Not Found")

// In the example below, since the string 
//Not Found is not needed, the corresponding 
//expression is passed with _ operator
let (justTheStatusCode, _) = http404Error
print("The status code is \(justTheStatusCode)")
// Prints "The status code is 404"

Come accedere facilmente ai dati di una tupla?

let http404Error = (404, "Not Found")

print("The status code is \(http404Error.0)")
// Prints "The status code is 404"
print("The status message is \(http404Error.1)")
// Prints "The status message is Not Found"

Assegnare nomi ai valori di una tupla

let http200Status = (statusCode: 200, description: "OK")
print("The status code is \(http200Status.statusCode)")
// Prints "The status code is 200"
print("The status message is \(http200Status.description)")
// Prints "The status message is OK"

Le tuple possono essere utilizzate soprattutto come tipi restituiti

Congratulazioni