本篇文章以 30 seconds of code 仓库中 functional-programming-introduction.md 一文为主体，结合仓库内 JavaScript 函数式编程集合（ functional-programming.yaml ）及其系列文章，完整讲解纯函数、不可变性、高阶函数、递归四大核心概念，并延伸覆盖柯里化、函数组合、函数元数、偏应用、记忆化等进阶主题。

这里 Array.prototype.push () 直接 原地修改 了 arr 这个数组——它没有产生新数组，而是改变了既有数组的内容。 而在 函数式编程 中， 数据被视为不可变的（immutable） ，即一旦创建就不能被改变。 与其修改既有数据，不如基于旧数据创建新数据。

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