Functional Programming: A PragPub Anthology

Nested Functions

And in case you haven’t had enough of functions from this chapter, it’s always good to know that in Swift, you can have a function inside a function:

func myFunctionWithNumber(someNumber: Int) {

    func increment(var someNumber: Int) -> Int {
        return someNumber + 10
    }

    let incrementedNumber = increment(someNumber)
    println("The incremented number is \(incrementedNumber)")
}

myFunctionWithNumber(5)
// The incremented number is 15
@end

Swift functions have a lot of options and a lot of power. As you start writing in Swift, remember: with great power comes great responsibility. Optimize for readability over cleverness!

Swift best practices haven’t been fully established yet, and the language is still constantly ...