newlispfanclub.alh.net

Hello, I'm trying to understand how to utilize the contexts of newlisp to implement various lexical bound idioms, for instance returning closures. Take this CL code for example: (defun make-multiplier (x) (lambda (y) (* x y)) make-multiplier is a generator of multiplier functions. It can generate as...

It just feels a little clunky to me that this 'catch' should wrap a loop to enable us to exit from it. Perhaps 'dolist' can be expanded by means of a macro to enable a more structured way to exit from a loop. I know. I felt the same way when I found out that 'return' in CL works by the fact that al...

So, the common idiom in newlisp for returning (breaking) in the middle of the loop is by using the exception ? I like to think of 'catch/throw' as non-local exiting (i.e. I treat it in this more generic sense as a programming construct). Non-local exits can be used (are most often used?) for except...

Comments and discussion are beginning to pile up on both the blog and comp.lang.lisp

I strongly encourage newlisp enthusiasts to participate. In my opinion it can be a great learning experience for us all - using comparisons is a great way to learn.

rickyboy wrote:

Is there no way to achieve this without catch / throw ?

Yes, there is a way: with recursion, my good man, with recursion. :-)

So, the common idiom in newlisp for returning (breaking) in the middle of the loop is by using the exception ?

Yes, here is another similar 'lazy' evaluating version (also written as a macro): (define-macro (my-and) (catch (dolist (i (args)) (if (not (eval i)) (throw nil) true)))) now only tested elements up to the thrown are evaluated Lutz Is there no way to achieve this without catch / throw ?

Hi,

I have posted an article about my impression of newlisp:
http://eli.thegreenplace.net/2006/04/20 ... t-of-lisp/

Comments from the newlisp point of view are more than welcome.
Eli

Lutz, Thanks for the very informative post - this is exactly what I was looking for. I want to address a few points: 1) I agree that the division between "wanting to evaluate all arguments" and "not wanting to evaluate some of the argumetns" is logical regarding usage of macros, in most cases. Howev...

Are newlisp macros evaluated at "compile time" - like CL macros (and C "macros", for that matter) ? This is important for performance, of course. No, since there is no compiling with newLISP. So everything in newLISP is interpreted. In CL you can save your modified image to file and gets your own m...

Welcome to the group Eliben! Macros and many other things are quite different from Common LISP or SCHEME. Most code except for very simple examples from books about LISP will not run under newLISP. To find out more about the differences from newLISP to Common LISP and SCHEME see the following page:...

Hello, I have a couple of questions, one of which is probably controversial. I want to note first that I'm here out of sheer curiosity as newLisp looks interesting. I come from a Perl / Ruby / C++ background with some knowledge and experience in Common Lisp. My intention is not flame, but rather a s...