Computed read-only property vs function in Swift

Question

In the Introduction to Swift WWDC session, a read-only property description is demonstrated:

class Vehicle {
    var numberOfWheels = 0
    var          


        

Answer 1

While a question of computed properties vs methods in general is hard and subjective, currently there is one important argument in the Swift's case for preferring methods over properties. You can use methods in Swift as pure functions which is not true for properties (as of Swift 2.0 beta). This makes methods much more powerful and useful since they can participate in functional composition.

func fflat(f: (A) -> () -> (R)) -> (A) -> (R) {
    return { f($0)() }
}

func fnot(f: (A) -> Bool) -> (A) -> (Bool) {
    return { !f($0) }
}

extension String {
    func isEmptyAsFunc() -> Bool {
        return isEmpty
    }
}

let strings = ["Hello", "", "world"]

strings.filter(fnot(fflat(String.isEmptyAsFunc)))