newlispfanclub.alh.net

Posted: **Fri Nov 28, 2008 6:18 pm**

You can use contexts as hash tables and see tham as assoc lists (manual: "The contents of the namespace can be shown as an association list:") But it appears you can't use all assoc-list techniques on them:

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newLISP v.9.9.95 on OSX IPv4 UTF-8, execute 'newlisp -h' for more info.

> (define Doyle:Doyle)
nil
> (Doyle "baker" 221)
221
> (Doyle "street" 26)
26
> 
> (Doyle)
(("baker" 221) ("street" 26))
> 
> (pop-assoc "baker" (Doyle))
("baker" 221)
> (Doyle)
(("baker" 221) ("street" 26))

although you can use others:

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> (find-all '(? 26) (Doyle) (println $0))
("street" 26)

What's the difference?

Posted: **Fri Nov 28, 2008 6:51 pm**

The list returned from (Doyle) is generated from the namespace Doyle on the fly every-time you execute (Doyle).

So when you change that list you don't change the namespace, and then calling (Doyle) creates the complete list again.
But of course you could do:

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(set 'lst (Doyle))

(pop-assoc "baker" lst)

lst => (("street" 26))

Perhaps the manual should say instead of: "hash tables can be seen as association lists" to: "association lists can be created from hash tables".

Posted: **Sat Nov 29, 2008 10:56 am**

Thanks - I confused myself with my own writing, it seems... :)

BTW: How about a table for the manual showing which functions work on nested lists, and which on flat lists? I might have a go, but you might know of a shortcut... !

newlispfanclub.alh.net

removing items from hash table contexts...

removing items from hash table contexts...