On Tue, Dec 9, 2008 at 8:34 PM, Slava Pestov <[EMAIL PROTECTED]> wrote:
> Try doing that in Lisp or Haskell!
Since you asked :-)
Haskell's syntax actually makes this work quite nice enough to get
pretty close. Given a function 'while' in Haskell:
while s pred body tail
And a function doo ('do' is a reserved word I think):
doo while s pred body = while (body s) pred body
We can do:
doo while s pred body tail
Which calls the body first like the factor example. This is because
the latter is (do (while) s pred body) not (do (while s pred body))
using Haskell's evaluation rules.
Chris.
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