How do I have a function return no value (not even nil). I am
collecting elements using a loop. In the body, there is an if
statement, that returns a specific value in some instances and returns
nil otherwise. I do not want the 'collect' to collect the nils. That
is, I would like to have the else-form of my conditional return no
value, not nil. Thanks.
One option:
(loop ...
when (<your body with an if>)
collect it)
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Re: Getting a number from a string ... (defun read-safely-from-string (str) ... (let ((*read-eval* nil))... (defun read-safely-from-string (string) ... (comp.lang.lisp)
Re: LOOP blows! ... My understanding of the LOOP specification is that your expectation is ... Even if the FOR Y = X clause were to work by stepping a hidden integer ... and evaluating at every iteration to pull out the ... The problem with these implementations that return NIL is that they ... (comp.lang.lisp)
Re: Loop for and behaviour ... This is SBCL 0.8.10.48, an implementation of ANSI Common Lisp.... ; in: LAMBDA NIL... I think what is happening here is that the loop is binding its own ... (comp.lang.lisp)
