contains? has always been a little counter-intuitive. It essentially only
works on collections that allow for a constant or logarithmic lookup time,
and often works on the "keys" of a collection, rather than its values. The
only exception to this are sets, where the values are essentially keys as
well.
So:
(contains? {:a 1} :a) => true
(contains? {:a 1} 1) => false
(contains? [:a] :a) => false
(contains? [:a] 0) => true
(contains? #{:a} :a) => true
(contains? "a" \a) => error
(contains? '(:a) :a) => error
- James
On 12 May 2015 at 19:25, Shantanu Kumar <kumar.shant...@gmail.com> wrote:
> Hi,
>
> I notice the following in Clojure 1.7.0-beta2:
>
> user=> (contains? "hello" 2)
> true
> user=> (contains? "hello" \e)
>
> IllegalArgumentException contains? not supported on type: java.lang.String
> clojure.lang.RT.contains (RT.java:800)
>
>
> Is this just a case of misleading error message or am I missing something?
>
> Shantanu
>
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