— What's wrong with just doing this?
bfs(obj, null, blacklist)
— With the null replacing whitelist for when you only want to use blacklist
— TRGWII ^ ?
I feel like having to put null to only use the blacklist is the most easy of all these ideas
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— Well, yeah, it might be
— But it's sort of ugly and PHP-ish too
— It's the easiest, but is it the best?
— I think it is the least expensive solution
— The only other thing would be to expose state via curried environment monads
— Ask. How to set and get session?
— Which is great for shared state, as you are using pure functions