I much prefer struct{}. For gophers, it is very expressive of "nothing to
see here". This value has no meaning, so don't even bother with it.
And as someone else said, the _, ok pattern is so pervasive, it's no harder
for me to read than if myMap[foo] {
if _, ok := myMap[foo]; ok {
}
I think it tells the story better than bool. If you use bool, you're
saying "this value could be true or false", when in fact, the value should
always be true, or not exist.
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