optional then?

[Torsten Anders]

On Monday, May 19, 2003, at 08:51  pm, Denys Duchier wrote:

> gabor.szokoli at vanderbilt.edu (Gabor Szokoli) writes:
>> Would it make sense to make the "then" part of the if-then-else
>> optional just like the "else" part is?
> Is there any programming language in which the
> "THEN" part is optional?

In Lisp you have both 'when' (quasi if without else) and 'unless' (quasi if 
without then). 'unless' is easy to read for me. Lisp is full of special 
forms (control structures) because it does not use keywords. But I doubt it 
is a good idea to add more keywords to Oz.

Best,
Torsten

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