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document set-comp

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Tuukka Turto 2014-04-28 21:35:28 +03:00
parent 3a66a2d1be
commit 01fa9d6a3c
1 changed files with 20 additions and 4 deletions
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docs/language/api.rst
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@ -274,13 +274,13 @@ however is called only for every other value in the list.
dict-comp
---------
`dict-comp` is used to create dictionaries. It takes two or three parameters.
`dict-comp` is used to create dictionaries. It takes three or four parameters.
The first two parameters are for controlling the return value
(key-value pair), while the third is used to select items from a sequence. The
fourth and optional parameter can be used to filter out some of the items in
the list based on a conditional expression.
the sequence based on a conditional expression.
.. code-block:: clj
.. code-block:: hy
=> (dict-comp x (* x 2) [x (range 10)] (odd? x))
{1: 2, 3: 6, 9: 18, 5: 10, 7: 14}
@ -654,7 +654,7 @@ parameter can be used to filter out some of the items in the list based on a
conditional expression. `genexpr` is similar to `list-comp`, except that it returns
an iterable that evaluates values one by one instead of evaluating them immediately.
.. code-block:: clj
.. code-block:: hy
=> (def collection (range 10))
=> (def filtered (genexpr x [x collection] (even? x)))
@ -1036,6 +1036,22 @@ element:
[1, 2, 3, 4, 5, 6, 7, 8, 9]
set-comp
--------
`set-comp` is used to create sets. It takes two or three parameters.
The first parameter is for controlling the return value, while the second is
used to select items from a sequence. The third and optional parameter can be
used to filter out some of the items in the sequence based on a conditional
expression.
.. code-block:: hy
=> (setv data [1 2 3 4 5 2 3 4 5 3 4 5])
=> (set-comp x [x data] (odd? x))
{1, 3, 5}
slice
-----