Four hours ago, Stefan Schmiedl wrote:
> On Sun, 13 Feb 2011 13:35:48 -0500
> Stephen Bloch <sbl...@adelphi.edu> wrote:
>
> > How is this an improvement on
> > (test (exact-nonnegative-integer? (fib 10)) => #t
> > (fib 10) => 55)
> > which doesn't require any special cases at all?
>
> +1 on that.
>
> (test
> (foo) => #t
> (bar) => 'baz)
>
> would be very easy to type and quick to read and also force you to
> make explicit if you expect something specific or just anything
> not-#f.
It makes sense to test for non-#f-ness since you might test using more
than plain predicates. For example:
(test (member 'x (union '(x y z) '())) => ???)
And even ignoring the argument about `member' vs a `member?', the
bottom line is that the test of "non-#f" is very common -- so I really
don't want to force people to write some verbose
(test (and E #t) => #t)
or
(test (not (not E)) => #t)
or even
(test (true? E) => #t)
--
((lambda (x) (x x)) (lambda (x) (x x))) Eli Barzilay:
http://barzilay.org/ Maze is Life!
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