August 2018
Beginner to intermediate
382 pages
7h 14m
Chinese
Content preview from Perl语言入门
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357
附录D
实验特性
你可以全部跳过本附录，也许不知道实验特性也就不会受其困扰；或者不问究竟地直
接按给出的示例代码使用，不去担心底层的什么问题。但我们认为还是希望你能明白
其中所以然并善加使用。
许多
Perl
新特性其实并不很“新”，它们只是属于实验性的。你必须自己启用这些特
性才能使用，这些特性在将来的新版本中可能会变化，甚至消失。实际上，
Perl 5.24
着实去掉了两项实验特性。
这其实很明智。大家可以安装最新的
perl
并立即使用新特性。他们可以测试这些新特
性，看看它们和其他特性之间是否能畅通协作，或者更进一步，慢慢发展出符合使用
场景的习惯用语。或者，开发者也可以完全忽略新特性，不用担心向后兼容的问题。
Perl 5 Porters
的人，也就是开发并维护
Perl
核心代码的人，通过观察大家如何使用这
些新特性从而持续改进，待时机成熟后让它们成为固定特性。
本书应该有义务向你展示最佳的、最激动人心的实验特性，但我们不希望你完全依赖
这些特性，说不定书出版发行后就有了变数。我们在使用新特性的时候会提示到本附
录深入了解，这样就不用反复解释了。
feature
模块的文档列出了大部分新特性的简要使用描述。你可以阅读每个
Perl
版本
的
perldelta
文档，了解每次的进展。我们在表
D-1
中列出了大部分新特性的最新状
态。在开始之前，我们先来说下背景故事。
358
｜
附录
D
Perl
的简明发展史
Perl
已经历经几十年的发展，一代又一代，每代都有自己的故事。了解当时的情况有
助于理解为什么 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.