On 02/12/2016 01:47 PM, Kevin Downey wrote:
> On 02/12/2016 01:37 PM, Alan Thompson wrote:
>> Hey - Just saw something on the clojure.core/type function:
>>
>>
>>
>> (defn type
>> "Returns the :type metadata of x, or its Class if none"
>> {:added "1.0"
>> :static true}
>> [x]
>> (or (get (meta x) :type) (class x)))
>>
>>
>>
>> I have never seen this before, and it appears the :type metadata is not
>> used in the clojure.core source code itself. Is this ever used for
>> anything or is it just a vestigial remnant from long ago?
>>
>> Alan
>
> It is used by the printing system (see core_print.clj). If I write a
> multimethod that is dispatching on type/class whatever, `type` is the
> first function I reach for.
Oh, my mistake, print-method actually re-implements `type`, with the
added restriction that is has to be a keyword.
>
>>
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>
--
And what is good, Phaedrus,
And what is not good—
Need we ask anyone to tell us these things?
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