map[T]struct{} is the set type in Go. (Note that struct{} is represented with 0 bytes of memory, so it's not chaff.)
You might like the slices proposal for utility functions like these: https://github.com/golang/go/issues/45955
You might like the slices proposal for utility functions like these: https://github.com/golang/go/issues/45955
I'll admit freely that I'm not a proficient Go programmer, so it's easier for me to see the things I don't like than the things that Gophers praise. But even this solution leaves me unsatisfied, in contrast to what I'd reach for in Rust or even C++: it requires that I know that struct{} is zero-sized, and I still have to do the manual legwork of writing a CS101 dedupe function.
Like, if you tell Rust you want 4 million empty tuples in a vector, it will give you a vector with exactly 4 million empty tuples in it and no heap allocation because those empty tuples don't take space, so, 4 million of them also doesn't take up any space.
Because Rust has generics, it is more ergonomic though.
https://doc.rust-lang.org/std/collections/struct.HashSet.htm...