is there a DEF in gdl? I mean defining functions.

[Jack D]

I've been hearing time and time that GDL is based of BASIC. I know that it doesn't have everything that BASIC has but I'm also a bit weirded out that GDL doesn't have basic programming structure like functions. I haven't seen any mention of defining functions in the GDL resource. They do however have mentioned functions to basic stuff but not me creating one.

Is there anyway to create functions? seems like macros are the closest to functions? 

[Jack D]

I'm slowly realising this and also many concepts I've learnt over the years don't quite work with gdl. well sort of... I can still do "callback" via macros. But it's not that intuitive.