scala柯里化函数

定义curried函数：def add(a: Int)(b: Int)=a+b

调用：                    var addOne=add(1) _

                                addOne(2)

out:                             3

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将已有函数curried（科里化）：

被curried函数：def add(a: Int, b: Int): Int=a+b

curried:             val addCurried= (add _).curried

    调用：            val addOne=addCurried(1)

                           addOne(2)

    out:                 3

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