Tassilo Horn <tass...@member.fsf.org> writes:
>> As an aside, when playing around with quoting and unquoting, I
>> noticed that the result of ('+ 3 5) is 5. I'm not sure what I would
>> have expected (maybe an error?) but it wasn't the third item of the
>> list. Is there any reason for this?
>
> Symbol implements AFn and can thus be invoked. The implementations just
> call RT.get() which is a lookup for associatives. So
>
> ('+ 1) == (get '+ 1)
>
> and
>
> ('+ 1 :not-found) == (get '+ 1 :not-found)
>
> Since Symbols are nothing associative, you'll always get nil in the
> former case and whatever you gave as "not-found" value in the latter
> case.
>
> Well, that explains your observation, but I have no clue how that should
> make sense...
Argh, I've read the code wrongly. The impl in Symbol calls RT.get(obj,
this), not RT.get(this, obj), so that's why symbols can lookup
themselves in maps.
('foo {'foo 1}) ==> 1
('foo {'foo2 1} :nope) ==> :nope
Bye,
Tassilo
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