Re: [NTG-context] METAPOST vardef returning multiple and non-numeric types as a single answer?

Maybe a nice little explanation (educational with good examples) of ‘how to use pass by reference’ and ‘building and using complex data structures’ would be useful for people. Say, some ‘patterns’. G

On 16 Mar 2020, at 10:38, Hans Hagen wrote:

that said, after muy share of mp programming i would not have thought about the text y as pass by reference, also because it's only true for these pseudo arrays (maybe suffixes also work)