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foreach - else clarification

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Tuukka Turto 2013-07-10 08:24:58 +03:00
parent 08734602ca
commit e09a89b7cf
1 changed files with 23 additions and 2 deletions
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25
docs/language/api.rst
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@ -252,8 +252,29 @@ collection and calls side-effect to each element in the collection:
(foreach [element collection] (side-effect element))
;; foreach can have an optional else block
(foreach [element collection] (side-effect element)
(else (side-effect2 element)))
(foreach [element collection] (side-effect-2 element)
(else (side-effect-2)))
The optional `else` block is executed only if the `foreach` loop terminates
normally. If the execution is halted with `break`, the `else` does not execute.
.. code-block:: clj
=> (foreach [element [1 2 3]] (if (< element 3)
... (print element)
... (break))
... (else (print "loop finished")))
1
2
=> (foreach [element [1 2 3]] (if (< element 4)
... (print element)
... (break))
... (else (print "loop finished")))
1
2
3
loop finished
get