Custom Operator >>>

gistfile1.swift

typealias StringGarbler = String -> String

infix operator >>> { associativity left }

func >>> (lhs:StringGarbler,rhs:StringGarbler) -> StringGarbler {
    return {
        s in rhs(lhs(s))
    }
}

func rev() -> StringGarbler {
    return {str in String(str.characters.reverse())}
}

func dropper() -> StringGarbler {
    return {str in String(dropFirst(str.characters)) }
}

let stringGarbler =  dropper() >>> rev()
stringGarbler("Hello Swift") // "tfiwS olle"

let stringGarbler2 = rev() >>> dropper()
stringGarbler2("Hello Swift") // "fiwS olleH"