dentaku VS gval

i'm super confused by "which gems you can't live without". is this my personal debugging collection of pry-rails, bullet and other things? i mean, whatever is required and does the job i guess. i absolutely love Dentaku gem and build awesome stuff with it in 2 different companies where it absolutely contributed to their product in huge ways (https://github.com/rubysolo/dentaku) . i also love Victor (https://github.com/DannyBen/victor) where i draw epic custom charts which are used in reports that been generated for billion dollar real estate funds.

A naive implementation - there's just one custom error and most of the API relies on built-in errors like RuntimeError and ArgumentError. Needless to say, this is a poor showing, problems will be hard to debug.

You can try this gem : https://github.com/rubysolo/dentaku

I haven't looked at Keisan, but I'd also recommend Dentaku for the same purpose.

For practical start, see this: https://www.youtube.com/watch?v=JiViND-bpmw It explain one particular type of parser type that is quite easy to grasp and fun to write. Also look on some libraries that deliver "expression executors" - these are in fact small interpreted languages and can give you plenty of examples. Classic one (though currently unmaintaines I think) is: https://github.com/PaesslerAG/gval but there are plenty more, just google for them. On my last words, this is very enjoyable part of programming but it requires much learning so be patient and have fun!

There is a nice lib that let you write much more compact expressions https://github.com/PaesslerAG/gval I'm using this lib for evaluating expressions in a small BPMN engine. At least your solution is missing a context, functions and data to work on. But trying stuff out is propably the best way to learm Go!