Great! Thanks all for your explanations.
On Wednesday, January 27, 2016 at 4:33:40 AM UTC-8, gianluca torta wrote:
>
> Hi Dan,
>
>
> And, if I understand correctly, what was really happening with the macro
>> bar was that in ('+ 2 'u), '+ was looking itself up in 2, not finding
>> itself, and so returning the default value 'u. This was the expansion of
>> the macro, and so at run time, it was bound to 10.
>>
>>
> exactly, indeed one would expect that the list:
> ('+ 2 'u)
>
> would throw an exception, since the first element does not evaluate to a
> macro/function
>
> however, Clojure allows the use of symbols (in this case, '+) as functions
> that lookup themselves into the collection that follows
>
> this special syntax does not apply to numbers:
> (1 2 'u)
> ;=> ClassCastException java.lang.Long cannot be cast to clojure.lang.IFn
> user/eval7633 (form-init2468783434806143559.clj:1)
>
> cheers,
> Gianluca
>
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