In functional programming, lambdas are referred to as first-class functions because they can be.
在函数式编程中，lambdas被称为一流的函数因为它们能够。
In this article, I'll continue this tour of concepts by talking about first-class functions, optimizations, and closures.
在本文中，我将继续讨论这些概念，讲解一级函数、优化和闭包。
Specifically, functional programming languages must provide high-order and first-class functions, which this article defines.
特别地，函数式编程语言必须提供高阶和一流的函数，这是本文所定义的。
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