composeAndApply in swift

composeAndApply.swift

func composeAndApply<T>(funcs: (T -> T)[], val: T) -> T {
    return funcs.reduce(val, combine: { (memo, aFunc) in aFunc(memo) })
}

func square(val: Int) -> Int {
    return val * val
}

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

func addSome(a: Int) -> (Int -> Int) {
    return {(val: Int) -> Int in val + a }
}

composeAndApply([square, double, addSome(3)], 5) // => 53