Swift Tutorial - Tutorialspoint

Swift language provides 'Generic' features to write flexible and reusable functions and
types. Generics are used to avoid duplication and to provide abstraction. Swift standard
libraries are built with generics code. Swifts 'Arrays' and 'Dictionary' types belong to
generic collections. With the help of arrays and dictionaries the arrays are defined to hold
'Int' values and 'String' values or any other types.

func exchange(inout a: Int, inout b: Int) {

let temp = a

a = b

b = temp

}

var numb1 = 100

var numb2 = 200

println("Before Swapping values are: \(numb1) and \(numb2)")

exchange(&numb1, &numb2)

println("After Swapping values are: \(numb1) and \(numb2)")

When we run the above program using playground, we get the following result:

Before Swapping values are: 100 and 200

After Swapping values are: 200 and 100

Generic Functions: Type Parameters

Generic functions can be used to access any data type like 'Int' or 'String'.

func exchange<T>(inout a: T, inout b: T) {

let temp = a

a = b

b = temp

}

var numb1 = 100

var numb2 = 200

32. SWIFT – GENERICS