pop and find

[newdep]

Hi Lutz,

I could be wrong that pop and find worked together previously...?
seems they don't, or was this realy always the case?

(set 'a '( "ab"))
(pop a (find "de" a))

ERR: missing argument

..that because 'find returned 'nil

PS: missing argument is somewhat strange here.. as 'nil is an argument
but not an index.

[newdep]

Actualy i have the same with =>

> (set 'a '( "a" "b" "c" "a"))
("a" "b" "c" "a")

>(pop a (ref "Z" a))

ERR: missing argument
>


I dont understand this, according to the manual list-indexes should
be possible together with 'ref.. Now i always need to check if 'ref isnt 'nil
and cant nest them anymore..

I know the ERR: was introduced someway back...
but Im a true? empty? nil? checking programmer..
(Time to assimilate with the consortium :-)


PS: Would be nice to have a summery in the manual that
displays in an Eye blink What functions return 'nil , '() or ERR: on errors..

[Lutz]

You cannot use an empty list () as an index, there has to be at least one number in it. Nothing has changed here, it always gave an error.

[newdep]

oke...good ;-) I though it was the Sun that hit me ;-)


I find myself more and more using (and ) & (or ) inside
newlisp, I almost dont use any begin, unless, if, when, anymore..

Is that a good thing or a bad thing? basicly it all comes back to 0 or 1..

But programming in the (and ) & (or ) mode is pretty specific and needs
to be secured..but the code looks very very very clean and readable! ;-)