factalk de swift

//: Playground - noun: a place where people can play import UIKit _ = "Hello, playground" //I'm not used func calculator (a: Int, b: Int, _ operation: (Int, Int) -> Int) -> Int { return operation(a,b) } // all examples = 6 let example1 = calculator(a: 2, b: 3) { (a: Int, b: Int) -> Int in return a * b } let example2 = calculator(a: 2, b: 3, { (a, b) in return a * b }) let example3 = calculator(a: 2, b: 3, { (a, b) in a * b }) let example4 = calculator(a: 2, b: 3) { $0 * $1 }