October 2022
Beginner to intermediate
390 pages
7h 5m
Chinese
Content preview from Perl语言入门（第8版）
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
346
｜
附录
B
内置变量
Perl
有一大堆内置变量（比如
@ARGV
和
$0
），它们能提供非常有用的信息，或者帮助
控制
Perl
的运作方式。请参阅
perlvar
文档。
引用
Perl
的引用跟
C
语言的指针差不多，不过工作原理比较类似
Pascal
或
Ada
里的相
应功能。引用会“指向”某个内存位置，但因为没有指针运算或内存的直接分配和
释放功能，所以你可以确定任何引用都是有效的。引用可以用来实现面向对象程
序设计、复杂的数据结构以及其他有用的技巧。请参阅
perlreftut
和
perlref
文档。
Intermediate Perl
一书对引用也做了详尽的解说。
复杂的数据结构
引用能够让我们用
Perl
构造复杂的数据结构。比如需要二维数组的话，就可以通
过数组的引用来构造。
Perl
还能构造更加有趣的数据结构，比如由哈希组成的数
组、由哈希组成的哈希、由哈希的数组组成的哈希等等。请参阅解说数据结构示例
的
perldsc
文档和讲解“列表的列表”的
perllol
文档。再说一次，
Intermediate Perl
详细介绍了这部分内容，包括复杂数据的操作技巧，比如排序和统计等。
面向对象编程
没错，
Perl
也有对象，并且和其他语言是术语兼容的（
buzzword-compatible
）。面象
对象（
Object-Oriented
，
OO
）编程让你能够通过继承、覆盖以及多态等方法实现复
杂的功能。不过，与某些面向对象语言不同，
Perl
并不要求你一定要用面向对象的方
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.