Pipeline.swift

infix operator --> { associativity left precedence 160 }

func --><T, S>(argument: T?, body: (T) -> (S)) -> S? {

    if let value = argument {
        return body(value) as S
    } else {
        return nil
    }
}

// Example:

func addTen(num: Int) -> Int {
    return num + 10
}

func double(num: Int) -> Int {
    return num * 2
}

2 --> addTen --> double --> println // prints 24

// or

2
    --> addTen
    --> double
    --> println // prints 24

// equivelant to:

println(double(addTen(2))) // prints 24