Composition In Swift

composition.swift

//: Playground - noun: a place where people can play

import Foundation

func getContents(url: String) -> String {
    var a = url.componentsSeparatedByString(".")
    var temp = ""
    for (index, element) in enumerate(a) {
        temp = "\(temp) \n \(element)";
    }
    return temp
}


func lines(input: String) -> [String] {
    return input.componentsSeparatedByCharactersInSet(
        NSCharacterSet.newlineCharacterSet())
}

let linesInURL = { url in count(lines(getContents(url))) }
linesInURL("a.n.t.o")


infix operator <<< { associativity left }
func <<< <A, B, C>(f: B -> C, g: A -> B) -> A -> C {
    return { x in f(g(x)) }
}

let linesInURL2 = count <<< lines <<< getContents
linesInURL2("a.n.t.o")