by errors I mean bugs
On Thu, Feb 28, 2013 at 11:43 PM, AtKaaZ <atk...@gmail.com> wrote:
>
>
>
> On Thu, Feb 28, 2013 at 11:23 PM, AtKaaZ <atk...@gmail.com> wrote:
>
>> => *(contains? '(1 2 3) 1)*
>> IllegalArgumentException contains? not supported on type:
>> clojure.lang.PersistentList clojure.lang.RT.contains (RT.java:724)
>>
>> => **clojure-version**
>> {:major 1, :minor 5, :incremental 0, :qualifier "RC17"}
>>
>>
>> => *(contains? "foo" "o")*
>> IllegalArgumentException contains? not supported on type:
>> java.lang.String clojure.lang.RT.contains (RT.java:724)
>>
>> => *(contains? [:a :b :c] :a)*
>> false
>>
>> whoops
>>
>> contains? clojure.core
>>
>> Argument Lists:
>> [coll key]
>>
>> Documentation:
>> Returns true if key is present in the given collection, otherwise
>> returns false. Note that for numerically indexed collections like
>> vectors and Java arrays, this tests if the numeric key is within the
>> range of indexes. 'contains?' operates constant or logarithmic
>> time;
>> it will not perform a linear search for a value. See also 'some'.
>>
>> => (contains? '[:a :b :c] 1)
>> true
>> => (contains? '[:a :b :c] 3)
>> false
>> => (contains? '[:a :b :c] 2)
>> true
>>
>> well, I would not have expected that
>>
>> the code for that is this:
> clojure.lang.APersistentVector.containsKey(Object)
>
> public boolean containsKey(Object key){
> if(!(Util.isInteger(key)))
> return false;
> int i = ((Number) key).intValue();
> return i >= 0 && i < count();
> }
>
> if you ask me, it should throw rather than return false, that is, if
> anyone cares about not introducing subtle errors easily
>
>>
>> On Thu, Feb 28, 2013 at 11:14 PM, Irakli Gozalishvili
>> <rfo...@gmail.com>wrote:
>>
>>> Hi,
>>>
>>> Function
>>> contains?<http://clojuredocs.org/clojure_core/clojure.core/contains_q>
>>> returns
>>> true if key is present in the given collection, although arguably on some
>>> data structures
>>> one would expect behaviour to be different. In fact it's already
>>> different on sets:
>>>
>>> (contains? #{:a :b :c} :a) ; => true
>>>
>>> Would that be reasonable to change behaviour for other types too like:
>>>
>>> (contains? [:a :b :c] :a) ; => false
>>> (contains? "foo" "o") ; => false
>>> (contains? '(1 2 3) 1) ; => false
>>>
>>> So they do return `true` instead ?
>>>
>>> If that will break too much code, maybe some other function can be added
>>> instead ?
>>>
>>> Regards
>>> --
>>> Irakli Gozalishvili
>>> Web: http://www.jeditoolkit.com/
>>>
>>> --
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>>>
>>
>>
>>
>> --
>> Please correct me if I'm wrong or incomplete,
>> even if you think I'll subconsciously hate it.
>>
>>
>
>
> --
> Please correct me if I'm wrong or incomplete,
> even if you think I'll subconsciously hate it.
>
>
--
Please correct me if I'm wrong or incomplete,
even if you think I'll subconsciously hate it.
--
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