Swift Chain Function

Swift Chain Function.swift

/*
 * chain takes in any number of 1-argument functions as arguments
 * and returns a function that executes each function in order
 */

func chain<T>(all: T -> () ...) -> T -> () {
    return { x in
        for f in all { f(x) }
    }
}

// Example

var stack: [Int]

chain(stack.append, println)(10)
// is equivalent to
stack.append(10)
println(10)