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> Isn’t reference counting a type of garbage collection?

Reference counting leads to memory leaks if cycles occur. Garbage collection algorithms don't have this problem.

I checked and you are not correct.

Reference counting is a type of garbage collection.

On the other hand:

"Garbage collection vs. ARC"

This (sub)headline only makes sense if garbage collection and ARC are different concepts.

Hmm I think they are referring to GC as “traditional” GC, but I will concede that they don’t seem to say that.