Re: cl-dolist, dolist, cl-return,

[Pascal J. Bourguignon]

Emanuel Berg <embe8573@student.uu.se> writes:

> I just wrote the below code.
>
> `cl-return' works for `cl-dolist', but not for
> `dolist' because it hasn't an "implicit nil block ...
> established around the loop". And there is no
> `return'! I think this "cl-" stuff is confusing.
> Anyone cares to explain?

emacs lisp is too limited, it lack Common Lisp packages or any other way
of namespace.  Therefore people have to use prefixes instead of package
names.


> By the way, I know there are one zillion loops
> in Lisp. What is the conventional way to
>
>     1. iterate a list
>     2. until some condition is met for some element
>     3. then break, to speak in C
>
> ?

  (loop for item in list
        until (some-condition-p item))

        
> And: With [cl-]dolist, if the list is an expression
> and not an atom, does that get evaluated once, or does
> it happen every iteration like, say, a string length
> test would, again in C?

Once.


> Also: why isn't there a "neq"?

(defun neq (x y) (not (eq x y))
; now there is.


-- 
__Pascal Bourguignon__                 http://www.informatimago.com/
“The factory of the future will have only two employees, a man and a
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