函数式语言中的函数称为一级函数，这意味着函数可在任何其他语言结构(比如变量)可能出现的地方出现。

Functions in a functional language are considered first class, meaning that functions can appear anywhere that any other language construct (such as variables) can appear.

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函数式语言中的函数称为一级函数，这意味着函数可在任何其他语言结构(比如变量)可能出现的地方出现。

Functions in a functional language are considered first class, meaning that functions can appear anywhere that any other language construct (such as variables) can appear.

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