Print Page - Why comma is special?

Title: Why comma is special?
Post by: Kazimir Majorinc on July 09, 2008, 03:03:37 AM

I noted that comma cannot be part of the symbol; it appears identifier

x,y

is understood like it is the sequence of three symbols

x , y

Is it intentional?

Title:
Post by: Jeff on July 09, 2008, 05:04:47 AM

Yes, it is intentional. The comma is a newlisp idiom for establishing local variables in a function:

Code Select Expand
(define (foo param , a b c)
  ;; here, a, b, and c are nil
  (println "Hello world"))

Title:
Post by: DrDave on July 09, 2008, 05:16:15 AM

From the manual

~~Quote~~Some of the example programs contain functions that use a comma to separate the parameters into two groups. This is not a special syntax of newLISP, but rather a visual trick. The comma is a symbol just like any other symbol.

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Post by: Jeff on July 09, 2008, 05:23:52 AM

It is a symbol and may be set, but the comma is recognized individually by the parser and is not a valid character in other symbols.

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Forum => newLISP newS => Topic started by: Kazimir Majorinc on July 09, 2008, 03:03:37 AM