Functional Programming: A PragPub Anthology

Calling All Functions

One of the big differences between Swift and Objective-C is how parameters work when a Swift function is called. If you love the verbosity of Objective-C, like I do, keep in mind that parameter names are not included externally by default when a Swift function is called:

func hello(name: String) {
    println("hello \(name)")
}

hello("Mr. Roboto")

This may not seem so bad until you add a few more parameters to your function:

func hello(name: String, age: Int, location: String) {
    println("Hello \(name). I live in \(location) too.
            When is your \(age + 1)th birthday?")
}

hello("Mr. Roboto", 5, "San Francisco")

If you only read hello("Mr. Roboto", 5, "San Francisco"), you would have a hard time knowing what ...