development release newLISP v. 9.3.6

[Lutz]

* bug fixes for the new namespace hash functions



* changes and refinements in the 'wait-pid' functionality



* default values in 'lookup'





files and changes notes: http://newlisp.org/download/development/">http://newlisp.org/download/development/



ps: Mac Users, click on uninstall first if experiencing difficulties to insta;;. The script also removes the receipt for newLISP in /Library/Receipts

[lithper]

Few software projects could boast such speed in their report-fix cycles ;))

Thank you

[newdep]

Lutz, You're going fast in the 9.3.xx  series...

Im out for 3 months and I already need extra classes to keep up here ;-)

[newdep]

Hi Lutz,



The makefile_linux64 is not embeded inside the Makefile? Is there a reason for it?



norman.

[newBert]

Hello,



How to delete an association in a dictionnary (newLisp-3.9.6)?

Code Select Expand

(define invent:invent)
(map invent '("apples" "bananas" "oranges" "pears") '(430 312 274 137))
(println (invent)) ;-> (("apples" 430) ("bananas" 312) ("oranges" 274) ("pears" 137))

To remove an association I must do this:

Code Select Expand

(set 'lst (invent))
(pop-assoc (lst "apples"))
(println lst) ; -> (("bananas" 312) ("oranges" 274) ("pears" 137))
instead of:

Code Select Expand

(pop-assoc ((invent) "apples"))

The following attempt doesn't work either:

Code Select Expand

(define (remove ctx key)
   (pop-assoc (ctx key)))
   
(remove (invent) "apples")
(println (invent)) ; -> (("apples" 430) ("bananas" 312) ("oranges" 274) ("pears" 137))

Where do I err? ;-)

[Lutz]

pop-assoc is for association lists not hashes. See here:



http://www.newlisp.org/downloads/newlisp_manual.html#pop-assoc">http://www.newlisp.org/downloads/newlis ... #pop-assoc">http://www.newlisp.org/downloads/newlisp_manual.html#pop-assoc



to remove hash associations, just set them to nil:

Code Select Expand

> (invent "apples" nil)
nil
> (invent)
(("bananas" 312) ("oranges" 274) ("pears" 137))
>




The list you get when executing (invent) is an association list, but the method used to created hash associations stores the key-values pairs in a namespace:

Code Select Expand

> (symbols invent)
(invent:_bananas invent:_oranges invent:_pears invent:invent)
>


Associations in list are a different method of dealing with associations, and you can use pop-assoc here:

Code Select Expand

> (set 'Alist '(("apples" 430) ("bananas" 312) ("oranges" 274) ("pears" 137)))
(("apples" 430) ("bananas" 312) ("oranges" 274) ("pears" 137))

> (pop-assoc (Alist "apples"))
("apples" 430)

> Alist
(("bananas" 312) ("oranges" 274) ("pears" 137))
>


Perhpas what confuses you, is the fact that in namespace hashing (invent) recturns an association list. This is just for convenience, its a practical way to convert a hash namespace into an association list and vice versa:

Code Select Expand


; and association list

(set 'Alist '(("apples" 430) ("bananas" 312) ("oranges" 274) ("pears" 137)))

; convert it into a hash namespace

> (define invent:invent)

> (invent Alist)
invent

> (invent)
(("apples" 430) ("bananas" 312) ("oranges" 274) ("pears" 137))

> (invent "bananas")
323
>


So you can convert one data representation into the other. Namespace hashes are good for big data quantities, e.g. maintaining thousands or millions of key-value pairs. For a hundred or less, old fashioned association lists are faster.

[newBert]

To remove hash associations, just set them to nil

Ah, and it's even simpler than I thought :)

Perhpas what confuses you, is the fact that in namespace hashing (invent) recturns an association list.

Yes and, for my purpose, association lists are quite sufficient and more convenient. But I'll remember that hash tables are ...  

... just for convenience, its a practical way to convert a hash namespace into an association list and vice versa

Many thanks

:)