October 2022
Beginner to intermediate
390 pages
7h 5m
Chinese
Content preview from Perl语言入门（第8版）
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简介
｜
15
的空白。低级语言通常既难写又丑陋，但运行速度很快且不受限制。不管在哪台机器
上，要想赢过写得好的低级程序的运行速度，恐怕难于登天。它们几乎可以做所有工
作。而高级语言则是另一个极端，相对来说，它们通常速度缓慢、难写又丑陋，且限
制重重。如果操作系统不提供执行某些必要功能的接口，那么
shell
程序会有很多工
作无法完成。
Perl
则介于两者之间，容易使用，几乎不受限制，速度又很快，只是代
码看起来有点古怪。
好吧，现在让我们来细数一下上面提到的
Perl
的四大特点。
首先，
Perl
易于使用。注意，这里说的是容易使用，但
Perl
的学习曲线并不平坦。如
果你会开车，你一定是花了好几周或好几个月的时间来慢慢学习并熟悉，最后开起来
才会驾轻就熟。道理相通，当你刻意花费一定时间潜心学习和练习，慢慢地写
Perl
程
序对你而言就是很轻松的事了。
Perl
几乎不受限制，几乎没什么事是
Perl
办不到的。你大概不会想用
Perl
来编写中
断－微内核层次（
interrupt-microkernel-level
）的设备驱动程序（尽管已经有人这么做
了），但一般用来处理日常琐事的程序，不管是临时需要完成某项任务的小程序，还
是企业级的大型应用程序，都可以用
Perl
来完成。
Perl
的运行速度还是很快的。这是因为所有
Perl
开发者自己就是
Perl
用户，当然会
在一开始就把快速运行作为设计目标之一去实现。如果有人提议为
Perl
加上某个很
酷但可能拖慢其他程序的特性，
Perl
开发者绝对会驳回，除非找出让它变快的解决 ...
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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.