Swiftエンジニアが学ぶ高階関数「カリー化関数」 ref: http://qiita.com/shoheiyokoyama/items/04416501389c69544c5a

file0.sh

Prelude> max 4 5
5
Prelude> (max 4) 5
5

file1.hs

multTree :: Int -> Int -> Int -> Int
multTree x y z = x * y * z

file2.sh

Prelude> multTree 3 5 9
135

file3.sh

Prelude> let multTwo = multTree 9
Prelude> :t multTwo
multiTwo :: Int -> Int -> Int
Prelude> let muitOne = multTwo 3
Prelude> :t muitOne
muitOne :: Int -> Int

file4.swift

func multiple(_ x: Int, _ y: Int) -> Int {
    return x * y
}
multiple(3, 5)//15

file5.swift

func multiple(_ x: Int) -> (Int) -> Int {
    return { y in x * y }
}

multiple(3)(5)//15

file6.swift

let multClosure = multiple(3)

multClosure(5)//15
multClosure(4)//12

file7.sh

Prelude> multTwo 3 2
162
Prelude> muitOne 5
135