Way to get fresh variable?

Stream: general

[Daniel Donnelly]

Hi, is there a way to get the nearest unused upper-case Latin variable name and if it doesn't exist, then A1, B1, ... and if those are already used then A2, B2, etc?

[Daniel Donnelly]

I can handle the indexing and querying from the app, but how does one check that a single variable name does not exist as used already, in any scope that nests the current scope?

[Daniel Donnelly]

If it's hard to do or runs too slowly, I can keep track in my app