passAndReturnFunction.swift

//
//  main.swift
//  take_function_return_function
//
//  Created by Satoru Sasozaki on 8/6/16.
//  Copyright © 2016 Satoru Sasozaki. All rights reserved.
//

// Write a function which receives a function as its argument and returns a new function which uses the passed function.
// makeNewFunction receives a function with type (Int, Int) -> Int and returns a new function which
// increments the result of the function passed into makeNewFunction and returns it.

import Foundation

func add(first :Int, second: Int) -> Int{
    return first + second
}

func makeNewFunction(function: (Int, Int) -> Int) -> ((Int, Int) -> Int) {
    func increment(x: Int, y: Int) -> Int {
        return function(x,y) + 1
    }
    return increment
}

print(add(1, second: 2)) // should return 3
let addAndIncrement = makeNewFunction(add)
print(addAndIncrement(1,2)) // should return 4