=> *(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
On Thu, Feb 28, 2013 at 11:14 PM, Irakli Gozalishvili <[email protected]>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.
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