I agree about the counter-intuitiveness. I'm only wondering whether the
error message is a bit misleading "contains? not supported on type:
java.lang.String" because of course (contains? "hello" 2) works fine.
Shantanu
On Wednesday, 13 May 2015 00:12:19 UTC+5:30, James Reeves wrote:
>
> 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.s...@gmail.com
> <javascript:>> 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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