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Question Ponnumani Gurusamy · Aug 17, 2016

$function vs $$function

#Caché #ObjectScript

What are the difference between $ and $$ symbols using macro.

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Dmitry Maslennikov · Aug 17, 2016

Macro is $$$. Anyway, a little excerpt from documentation  

$
 

Dollar sign (36): Intrinsic (system) function prefix: $name(parameters).

Special variable prefix: $name.

$Znnn (a name beginning with $Z) can be a user-defined function or special variable defined using %ZLANG language extension library. It can also be an intrinsic (InterSystems supplied) function or special variable.

Regular expression end of string anchor; for example, (USA)$.

In ZBREAK debugging, a single-step breakpoint.

As first character at terminal prompt, load interactive subshell.
$$
 

Double dollar sign: Extrinsic (user-written) function prefix: $$name(parameters). $$ is returned by $STACK when context was established by an extrinsic function reference.

Prefix to a routine name to directly invoke that routine.
$$$  Triple dollar sign: Macro invocation prefix.
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