April 2012
Intermediate to advanced
296 pages
7h 3m
English
Content preview from Programming Clojure, 2nd Edition
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Making Macros Simpler
The unless macro is a great simple example, but most macros are more complex. In this section, we will build a set of increasingly complex macros, introducing Clojure features as we go. For your reference, the features introduced in this section are summarized in the following table.
Form | Description |
|---|---|
foo# | Auto-gensym: Inside a syntax-quoted section, create a unique name prefixed with foo. |
(gensym prefix?) | Create a unique name, with optional prefix. |
(macroexpand form) | Expand form with macroexpand-1 repeatedly until the returned form is no longer a macro. |
(macroexpand-1 form) | Show how Clojure will expand form. |
(list-frag? ~@form list-frag?) | Splicing unquote: Use inside a syntax quote to splice an unquoted list into a template. |
‘form ... |
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