That's only obvious if you already know how it works.
Jonathan
On Wed, Aug 7, 2013 at 2:13 PM, Karsten Schmidt <toxmeis...@gmail.com>wrote:
> The fact, that the docs refer to checking if a "key" is present in the
> collection, should make it obvious which types are supported, no? Only
> vectors, maps and sets have keys. Lists and seqs do not. Of course it never
> hurts to be more explicit about it...
> On 7 Aug 2013 12:49, "Marcus Lindner" <marcus.goldritter.lind...@gmail.com>
> wrote:
>
>> Thanks.
>>
>> But the problem is, that this is not mentioned in the documentation of
>> contains? I found so far :(.
>> I had such a problem a long time ago and remember now which type of
>> "collection" can be used with contains?. But after a time I will forget
>> this again and will refer to the documentation. (And when I get the
>> Exception I remember again.)
>>
>> And I think this question arise also more frequently.
>>
>> But then my assumption that the documentation of contains? is misleading
>> is true. Is it possible to update the documentation for the next version?
>>
>>
>>
>>
>>
>>
>> 2013/8/7 Baishampayan Ghose <b.gh...@gmail.com>
>>
>>> Hi,
>>>
>>> `contains?` only works with associative data-structures like maps &
>>> vectors. If you want to find out if a sequence contains a specific
>>> object then you need to use `some` paired with a set as a predicate.
>>>
>>> For example:
>>>
>>> (some #{3} '(1 2 3 4))
>>>
>>> Hope this helps.
>>>
>>> ~BG
>>>
>>>
>>> On Wed, Aug 7, 2013 at 4:54 PM, Goldritter
>>> <marcus.goldritter.lind...@gmail.com> wrote:
>>> > In an program I used the result of keys as an argument for a function
>>> which
>>> > verifies whether an object is in a passed collection or not.
>>> > The result I got was following Exception:
>>> > IllegalArgumentException contains? not supported on type:
>>> > clojure.lang.APersistentMap$KeySeq clojure.lang.RT.contains
>>> (RT.java:724)
>>> >
>>> > What are the reasons behind this Exception?
>>> >
>>> > In the documentation of contains? it is written, that
>>> > "Returns true if key is present in the given collection, otherwise
>>> returns
>>> > false."
>>> > The examples on this page
>>> > (http://clojuredocs.org/clojure_core/clojure.core/contains_q) and the
>>> > parameter description indicates, that contains? accept any collection
>>> as
>>> > argument.
>>> >
>>> > The result of keys is also a collection
>>> > => (coll? (keys {:a "f" :b 23}))
>>> > true
>>> >
>>> > So is this a bug or is there a reason behind the fact, that contains?
>>> does
>>> > not accept any collection?
>>> > Or is the documentation wrong and it should nor be a collection as
>>> argument
>>> > but a set or a vector?
>>> >
>>> > Because I get the same Exception for a list, but not for a vector.
>>> > The same for lists, which returns also true for coll?.
>>> > => (coll? '(1 2 3 4))
>>> > true
>>> >
>>> > => (contains? '(1 2 3 4) 3)
>>> > IllegalArgumentException contains? not supported on type:
>>> > clojure.lang.PersistentList clojure.lang.RT.contains (RT.java:724)
>>> >
>>> > => (contains? [1 2 3 4] 3)
>>> > true
>>> >
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>>>
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>>> b.ghose at gmail.com
>>>
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