Polymorphic Function Returns in Swift

main.swift

// In Swift, functions can be defined with identical parameter types, but different return types.

func isHello(string: String) -> Bool {
    if string == "Hello" {
        return true
    } else {
        return false
    }
}

func isHello(string: String) -> String {
    if string == "Hello" {
        return "Yep"
    } else {
        return "Nope"
    }
}

let numberResult: Bool = isHello("Hello")
// => true
let stringResult: String = isHello("Hello")
// => "Yep"