what's the difference

What is the difference between

'symbol and "myName" when used in LISP routines?I always use the quoted version but I see the 'version more often used in samples. Are they interchangable?

Some AutoLISP functions, (such as setvar / getvar / vlax-get / vlax-get-property / vlax-put / vlax-put-property / vlax-invoke / vlax-invoke-method), will accept both a quoted symbol or a string; in general, a quoted symbol and string are two different data types.

_$ (type 'symbol)
SYM
_$ (type "symbol")
STR

so if you are referencing an inbuilt variable you should be using 'symbol although it will work as "symbol".

so if you are referencing an inbuilt variable you should be using 'symbol although it will work as "symbol".

It makes no difference whichever is used, both are 'correct'

(getvar 'cmdecho)
(getvar "cmdecho")

I tend to use a quoted symbol as a personal preference (and because its easier to type).

I'll continue with the "quote marks" then as its an old habbit.