Re: Better? or less good?
David Christiansen <david-DRnKfiA+q4/[email protected]>
| Newsgroups | gmane.comp.lang.racket.user,gmane.lisp.scheme.plt |
|---|---|
| Message-ID | <CAF_itEu0QJT+7zBbJyOfjnZ_vsR+Lv0hT5a5x7kfQUwc6xdWjw@mail.gmail.com> |
Hi again,
> The latter has the same meaning as this:
>
> (let ((v #t))
> (if v v fnord))
>
> This is not even a program, because "fnord" has no meaning.
Robby pointed out off-list that I should point out that this is a
feature of Racket, not programming languages in general. In many other
languages, variable references are a runtime feature rather than a
part of the syntax. Here's some Elisp, which makes the other decision:
el> (let ((v t)) (if v v fnord))
t
Similar results are obtained in many languages. Others, however, work
as Racket does in this respect, like Idris:
Idris> let v = True in if v then v else fnord
When checking argument val to constructor Delay:
No such variable fnord
/David
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