Re: [q-lang-users] quote evaluation

[Kristof B. <kr...@vl...>]

> ---- snip -------
>> However I came across the following strange behaviour.  In the
>> equation: 
>> 
>>   test '(A B) = ('A, 'B);
>> 
>> I would expect test '(a (2 + 3)) to evaluate to ('a, '(2 + 3)),
>> however it evaluates to ('a, '5).  Is this the defined behaviour?
> 
> Yes, it is, but only since Q 7.1. The general rule is that, while
> special arguments of a function will never be evaluated, deferred
> subterms inside a _non-special_ arg are evaluated automatically when
> they are needed in the pattern matching process. This is a
> convenience so that non-special functions can assume matched
> subterms to be in (weak) normal form, which is important to make
> functions operating on lazy data structures such as streams do the
> right thing.

Yes, it makes more sense now!

>> Also, when using the Q interpreter to write scripts, it always
>> prints the last object to stdout.  Is there an option to turn it
>> off?  If I want to write a script that outputs some text, I
>> wouldn't want the output to be clobbered with an object.
> 
> Explicitly exiting from the program with `exit 0' probably does what
> you want.

Thanks, that does the trick.
If I get a working version of my html library, I'll let it know, and
post it somewhere!

Regards,
Kristof