Functions let us re-use code, which means we can write a function to do something interesting then run that function from lots of places. Repeating code is generally a bad idea, and functions help us avoid doing that.
func printHelp() {
let message = "Namste Swift"
print(message)
}
Run using
printHelp()
//output: Namste Swift
Values sent into functions this way are called parameters.
func sauChavan(Parameter: DataType){
//code
}
sauChavan(Parameter: argument)
func sauChavan(Surname:String){
let name="saurabh \(Surname)"
print(name)
}
sauChavan(Surname:"Chavan")
//Output: saurabh chavan
func square(number: Int) -> Int {
return number \* number
}
let result = square(number: 8)
print(result)
func sayHello(to name: String) {
print("Hello, \(name)!")
}
sayHello(to: "Saurabh")
//output: Hello Saurabh
//when we are not pass parameter
func Hello(_ person: String) {
print("Hello, \(person)!")
}
Hello("Saurabh")
//output: Hello Saurabh
You can refer here also best Way and easy Function