Visitor pattern help?

[hallow sinew]

Are there any good resources or patterns for developing an AST visitor in functional programming?

Asking for a friend :).

[chrome mango]

https://github.com/bcpeinhardt/code_review/blob/main/src/code_review/rule.gleam

^^^ An example of visiting over gleam expressions and statements with glance

[hallow sinew]

Thank you very much