This is a nice illustration of the expression problem, which the article itself points out toward the end. Multiple dispatch is a language-level way to solve it

This is a nice illustration of the expression problem, which the article itself points out toward the end. Multiple dispatch is a language-level way to solve it. Crafting Interpreters [1] has a very approachable Java-based chapter that also covers these patterns in detail. [0] https://en.wikipedia.org/wiki/Expression_problem https://en.wikipedia.org/wiki/Expression_problem [1] https://craftinginterpreters.com/representing-code.html https://craftinginterpreters.com/representing-code.html