Control Transfer Statements in iOS Programming Language Tutorial | What is the difference between continue, break, fall-through, throw and return in Swift Programming?

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Control transfer statements change the order during which your code is executed, by transferring control from one piece of code to a different .

Swift has five control transfer statements. What are they, and how can they be used?

continue

break

fallthrough

return

throw

Continue:

The continue statement tells a loop to stop what it is doing and start again at the beginning of the next iteration through the loop.

        var sum = 0
        for n in 0..<5 {

            if (n == 4) {
                continue
            }
            print("count loop value", n)
                sum += n
            print("Sum value", sum)
        }

// Output
count loop value 0
Sum value 0
count loop value 1
Sum value 1
count loop value 2
Sum value 3
count loop value 3
Sum value 6

Break:

A break statement ends program execution of a loop, an if statement, or a switch statement.

var sum = 0
        for n in 0..<5 {

            if (n == 4) {
                break
            }
            print("count loop value", n)
                sum += n
            print("Sum value", sum)
        }

// Output
count loop value 0
Sum value 0
count loop value 1
Sum value 1
count loop value 2
Sum value 3
count loop value 3
Sum value 6

Fallthrough:
Fallthrough is a keyword used in switch statement.If fallthrough exits in a sucessfull case it execute the next case irrespective of the case value match.
var sum = 0
    let num = 6
    switch num {
    case 2:
        sum += num
        print(sum)
    case 4:
        sum += num
          print(sum)
    case 6:
        sum += num
          print(sum)
        fallthrough
    default:
        sum += 10
        print(sum)
            }

//Output
6
16

Throw:
Use a throw statement to handle the error 
throw statement is used to stop current execution of functions or methods and throw error messages based on our requirements.

     enum DividingErr : ErrorType {

     case InvalidNumber

}

func divby(value: Int) throws -> Int {

guard value != 0 else {

throw DividingErr.InvalidNumber

}

return 20 
}

let res = try! divby(3)

print(res) //6

Return:
A return statement occurs in the body of a function or method definition and causes program execution to return to the calling function or method.

      override func viewDidLoad() {
            super.viewDidLoad()
        
           print(returnFunc(name: "AppCodeZip"))
         }
  
        func returnFunc(name: String) -> String{
        return name
    }

//Output
AppCodeZip

HAPPY LEARNING!

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