Tony Morris

@jonsterling @etorreborre @channingwalton @jsuereth @manaten a design pattern, as described by GoF, is an indication of lack of imagination.

@dibblego @jonsterling @etorreborre @channingwalton @jsuereth @manaten why? They describe workarounds for real problems in those languages.

@EyalL @jonsterling @etorreborre @channingwalton @jsuereth @manaten because they are illusory workarounds, worth less than air.

@dibblego @jonsterling @etorreborre @channingwalton @jsuereth @manaten disagree. Consider visitor workaround to lack of closed sums

@EyalL @jonsterling @etorreborre @channingwalton @jsuereth @manaten This is not even a good solution in such a broken environment.

@dibblego @jonsterling what's a better workaround? I think using product of exponents is nice way of encoding sums.

@EyalL @jonsterling GoF is on the right track, but disservices any useful solution with lack of principled explanation to point of unusable.

@dibblego People use visitor from GoF, so it's usable. They don't explain it in an algebraic way, but they do make it clear why it works.