What is Tuple?
Tuple is a data type in swift which can hold multiple values.
Creating a Tuple
simple way
let person = ("sandesh", "sardar", 27)
using named parameter
let person = (firstName:"sandesh", lastName:"sardar", age:27)
creating empty tuple
let person : (String, String, Int) OR let person : (firstName:String, lastName:String, age:Int) = nil
Reading from a Tuple
to read and store all tuple value in different variable
let (personFirstName, personLastName, personAge) = person personFirstName //output: "sandesh" personLastName //output: "sardar" personAge //output: 27
to read only particular values use “_” to ignore
let (personFirstName, personLastName, _) = person
read specific tuple value and store to variable
let firstname = person.0 //output: "sandesh" let lastname = person.1 //output: "sardar" let age = person.2 //output: 27
if tuple is with named parameter
let firstname = person.firstName //output: "sandesh" let lastname = person.lastName //output: "sardar" let age = person.age //output: 27
Returning a Tuple from a Function
func personDetails() -> (firstName:String, lastName:String, age:Int){ let firstname = "sandesh" let lastname = "sardar" let age = 27 return (firstname, lastname, age) }
Access Control and Tuples
A tuple’s access level is determined by its constituents, and is not set directly like you would for a property or function. A tuple’s access level will be that of its most restrictive component. So if one type is private, and the other is public, the tuple’s access control will be private.
A Tuple is a Value Type
var fullName = ("sandesh", "sardar") var personFullName = fullName personName.0 = "Harshal" fullname.0 //output: "sandesh" personFullName.0 //output : "Harshal"
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