pipegeneric.swift

func pipe<T>(_ fns: (T) -> (T)...) -> (T) -> (T) {
   return { (input) in fns.reduce(input, {value, fn in fn(value)})}
}

func addPrefix(_ prefix: String) -> (String) -> (String) {
    return {(inputStr) in "\(prefix) \(inputStr)" }
}

func addSuffix(_ suffix: String) -> (String) -> (String) {
    return {(inputStr) in "\(inputStr), \(suffix)" }
}

pipe(addOne, addOne)(1) // 3
pipe(addOne, addTwo, addOne)(1) // 5
pipe(addPrefix("The honorable"), addSuffix("himself"))("Curmodgeon") // "The honorable Curmodgeon, himself"