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最少のタイピングで部分適用を書く

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scala学習中です。こちらだと部分適用が非常に簡単に書けますね。

def sum(a: Int, b: Int, c: Int) = a + b + c

val a = sum(1, _: Int, 3)
println( a(2) )

swiftでもこのくらい簡単に書けたらいいのに…

と思った瞬間、ふと気が付きました。
よく考えてみるとswiftでも同じくらい簡単に部分適用が書けます。

func sum(a: Int, b: Int, c: Int) -> Int {
    return a + b + c
}

let a = { sum(1, $0, 3) }
println( a(2) )

なぜかswiftリリース以来ずっと気がつかなかったのでメモしておきます。

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