...Functions and Closures（函数和闭包） 函数的关键字是 func ，函数定义的格式是： funcfuncName(para:paraType) -> returnType{
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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。
I'll also circle back to some interesting comparisons between closures and higher-order functions in a later installment.
后续内容还会对闭包与高阶函数做一些有趣的对比。
After becoming comfortable with lambdas and closures, you may find yourself reducing code and creating more readable and reusable code by writing your own higher-order functions.
在适应了lambdas和closures以后，您可能会发现，通过编写您自己的高阶函数您已经减少了代码并创建了更多的可读与可用代码。
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