Recursive Closures in Swift

Here we are going to see examples of writing Recursive Closures.

1. Write a function, that will run a given closure for a given number of times

Solution:

    func repeatTasks(times: Int, task:()->Void)

    {

        for _ in 0..<times {

            task()

        }

    }

Calling the method:

    

      repeatTasks(10) { () -> Void in

            

            print("swift is great")

        }

2. Write a function that you can reuse to create different mathematical sums

Solution:

   func mathSum(times:Int, operation:(Int)->Int)->Int

    {

        var result = 1

        for i in 1...times{

            result+=operation(i);

            print("result==\(result)")

        }

        return result;

    }

Calling the method:

  mathSum(10) { (number ) -> Int in

            number * number;

        }

Writing the Same Math Sum using fibonacci series

Solution:

   func fibonacci(number: Int) -> Int {

        if number <= 0 {

            return 0

        }

        

        if number == 1 || number == 2 {

            return 1

        }

        

        return fibonacci(number - 1) + fibonacci(number - 2)

    }

Calling the method:

    mathSum(10) { (number) -> Int in

            self.fibonacci(number);

        }