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better macro example

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This commit is contained in:
Tuukka Turto 2013-07-19 12:06:23 +03:00
parent d580351b41
commit 22d8a78330
1 changed files with 12 additions and 10 deletions
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docs/language/api.rst
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@ -226,21 +226,23 @@ below:
defmacro
--------
`defmacro` is used to define macros.
`defmacro` is used to define macros. The general format is
`(defmacro [parameters] expr)`.
The general format is `(defmacro [parameters] expr)`.
Following example defines a macro that can be used to multiply all but the first
parameter given to it.
Following example defines a macro that can be used to swap order of elements in
code, allowing the user to write code in infix notation, where operator is in
between the operands.
.. codeblock:: clj
=> (defmacro multiply-some [&rest params] (quasiquote (* (unquote-splice (list (slice params 1))))))
=> (defmacro infix [code]
... (quasiquote (
... (unquote (get code 1))
... (unquote (get code 0))
... (unquote (get code 2)))))
=> (multiply-some 0 2 3)
6
=> (multiply-some 2 0 3)
0
=> (infix (1 + 1))
2
eval
----