composed.swift

infix operator • { associativity right precedence 140 }
func • <T, U, V>(g: U -> V, f: T -> U) -> T -> V {
    return { t in
        return g(f(t))
    }
}

func composed_setResizedImage(withURL url: NSURL) {
    let fetchResizedUrl = fetchData • requestForImageUrl • photonize(forSize: frame.size)

    fetchResizedUrl(url)({ data in
        unwrapOptional(
            imageFromResponseData(data),
            then: applyImageInMainQueue(to: self)
        )
    })
}