April 2012
Intermediate to advanced
296 pages
7h 3m
English
Content preview from Programming Clojure, 2nd EditionBecome 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,
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When to Use Macros
Macro Club has two rules, plus one exception.
The first rule of Macro Club is Don’t Write Macros. Macros are complex, and they require you to think carefully about the interplay of macro expansion time and compile time. If you can write it as a function, think twice before using a macro.
The second rule of Macro Club is Write Macros If That Is the Only Way to Encapsulate a Pattern. All programming languages provide some way to encapsulate patterns, but without macros these mechanisms are incomplete. In most languages, you sense that incompleteness whenever you say, “My life would be easier if only my language had feature X.” In Clojure, you just implement feature X using a macro.
The exception to the rule is that you ...
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