Print Page - Proposal: variable

Title: Proposal: variable
Post by: Kazimir Majorinc on March 08, 2009, 11:02:50 AM

Newlisp has constant:

Code Select Expand
> (set 'x 3)
3
> (constant 'x)
3
> x
3
> (set 'x 4)

ERR: symbol is protected in function set : x
>

May I suggest variable as opposite to constant? It should be also applicable on the symbols assigned to primitives. Theoretical reasons: completeness, distinguishing concept of variable and symbol, some increase of expressive power. Practical reasons: constant can replace set, but not let, letex, expand , delete... For example, something like this is currently impossible:

Code Select Expand
(letex ((println my-print))
         my-code)

Although it clearly has sense. In the case variable is introduced, form (constant sym-1 exp-1 [...]) is redundant and it can be deprecated or not.

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Forum => newLISP newS => Topic started by: Kazimir Majorinc on March 08, 2009, 11:02:50 AM