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Documentation of the &key modifier in (defn)

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Tim Martin 2016-01-26 20:27:07 +00:00
parent 2b49403507
commit b3a85801bd
1 changed files with 20 additions and 1 deletions
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docs/language/api.rst
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@ -400,7 +400,7 @@ below:
.. _defn: .. _defn:
defn defn
------------ ----
``defn`` macro is used to define functions. It takes three ``defn`` macro is used to define functions. It takes three
parameters: the *name* of the function to define, a vector of *parameters*, parameters: the *name* of the function to define, a vector of *parameters*,
@ -430,7 +430,26 @@ Parameters may have the following keywords in front of them:
101.0 101.0
&key &key
Parameter is a dict of keyword arguments. The keys of the dict
specify the parameter names and the values give the default values
of the parameters.
.. code-block:: clj
=> (defn key-parameters [&key {"a" 1 "b" 2}]
... (print "a is" a "and b is" b))
=> (key-parameters :a 1 :b 2)
a is 1 and b is 2
=> (key-parameters :b 1 :a 2)
a is 2 and b is 1
The following declarations are equivalent:
.. code-block:: clj
(defn key-parameters [&key {"a" 1 "b" 2}])
(defn key-parameters [&optional [a 1] [b 2]])
&kwargs &kwargs
Parameter will contain 0 or more keyword arguments. Parameter will contain 0 or more keyword arguments.