How to use Functions in swift

As you know function is play an important part in programing so today i want to  show  you how to use function in swift

What is a function?

Functions are self-contained chunks of code that perform a specific task. You give a function a name that identifies what it does, and this name is used to “call” the function to perform its task when needed.
Swift’s unified function syntax is flexible enough to express anything from a simple C-style function with no parameter names to a complex Objective-C-style method with names and argument labels for each parameter. Parameters can provide default values to simplify function calls and can be passed as in-out parameters, which modify a passed variable once the function has completed its execution.

Every function in Swift has a type, consisting of the function’s parameter types and return type. You can use this type like any other type in Swift, which makes it easy to pass functions as parameters to other functions, and to return functions from functions. Functions can also be written within other functions to encapsulate useful functionality within a nested function scope.

if i don't use the function i have to write code like this:

print("Apple")

print("Sam Sum")

print("HTC")

instead of you have to write code like that you can use the function ,in swift a function is defined by the func keyword 

func cellPhone(){

    

    print("Apple")

    

    print("Sam Sum")

    

    print("HTC")

    

}

Functions Without Parameters 

Functions are not required to define input parameters. Here’s a function with no input parameters, but have return value 

func sayHello()->String{

    

    return "Hello Word"

    

}

The function definition still needs parentheses after the function’s name, even though it does not take any parameters. The function name is also followed by an empty pair of parentheses when the function is called.

Functions with one parameter with no return value

func  Sayhello(to  name:String)

{

    

print("my name \(name)")

}

Sayhello(to: "Kevin")

Functions With Multiple Parameters

func Minus(numberA:Int, numberB:Int)->Int{

    let result = numberA+numberB

    print("the result \(result)")

    return result;

}

Minus(numberA: 3, numberB: 4)

i'm kevin i hope that this blog help you understand about function in swift