Macro Expansion Time vs. Runtime（宏展开期和运行期） Macro Expansion Time vs. Runtime（宏展开期和运行期） The key to understanding macros is to be quite clear about the distinction between the cod...

S-expressions（S-表达式） S-expressions（S-表达式） The basic elements of s-expressions are lists and atoms. Lists are delimited by parentheses and can contain any number of whitespace-s...

String Types String Types The other kinds of primitive types that are ubiquitous in the ID3 format are strings. In the previous chapter I discussed some of the issues you have ...

第十三章：速度 第十三章：速度 Lisp 实际上是两种语言：一种能写出快速执行的程序，一种则能让你快速的写出程序。 在程序开发的早期阶段，你可以为了开发上的便捷舍弃程序的执行速度。一旦程序的结构开始固化，你就可以精炼其中的关键部分以使得它们执行的更快。 由于各个 Common Lisp 实现间的差异，很难针对优化给出通用的建议。在一个实现上使程序变...

Function Return Values（函数返回值） Function Return Values（函数返回值） All the functions you’ve written so far have used the default behavior of returning the value of the last expression...

Constructing New Pathnames Constructing New Pathnames You can construct arbitrary pathnames using the **MAKE-PATHNAME** function. It takes one keyword argument for each pathna...

Threading macros Hint::Parens optional Reading Clojure code Rewriting the code with threading macros Hint::Macroexpand Threading macros The thread-first -> and thread-la...

DEFMACRO DEFMACRO As you saw in Chapter 3, macros really are defined with **DEFMACRO** forms, though it stands—of course—for DEFine MACRO, not Definition for Mac. The basic sk...

CDs and Records（CD 和记录） CDs and Records（CD 和记录） To keep track of CDs that need to be ripped to MP3s and which CDs should be ripped first, each record in the database will conta...

CDs and Records CDs and Records To keep track of CDs that need to be ripped to MP3s and which CDs should be ripped first, each record in the database will contain the title and...