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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
--------- ---------
`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 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 (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 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)) => (dict-comp x (* x 2) [x (range 10)] (odd? x))
{1: 2, 3: 6, 9: 18, 5: 10, 7: 14} {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 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. an iterable that evaluates values one by one instead of evaluating them immediately.
.. code-block:: clj .. code-block:: hy
=> (def collection (range 10)) => (def collection (range 10))
=> (def filtered (genexpr x [x collection] (even? x))) => (def filtered (genexpr x [x collection] (even? x)))
@ -1036,6 +1036,22 @@ element:
[1, 2, 3, 4, 5, 6, 7, 8, 9] [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 slice
----- -----