Am Mittwoch, 14. Januar 2015 13:56 CET, Urs Liska <[email protected]>
schrieb:
> OK, I see.
> But somehow it feels wrong that
>
> #(display annotation? some-obj)
>
> doesn't produce #t but the content of "location".
> Should I ignore that feeling?
If you intended to write
#(display (annotation? some-obj))
then, yes, ignore that feeling. Scheme, like all Lisps (that I know of) has
generalized booleans,
so anything that's not explicitly false [1] is considered true. Because of this
you hardly ever see
a litteral #t in Scheme code.
Cheers, RalfD
[1] while Scheme considers #f to be the only _false_ value, Common Lisp et al.
also consider
the empty list '() as a valse value.
> Urs
>
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