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What is an existential type Swift?

Existentials in Swift allow defining a dynamic value conforming to a specific protocol. Using primary associated types, we can constrain existentials to certain boundaries. The Swift team introduced the any keyword to let developers explicitly opt-in to a performance impact that might otherwise not be visible.

What is the difference between opaque and existential in Swift?

An opaque result is limited to one type. However, an existential type can return any type the meets the protocol requirements. Check out this simple example

What is the difference between existential type and universal type?

In short: whereas universally quantified type variables are instantiated at the use site (i.e. the user of the function has to choose which type they want that type variable to be), existentially quantified type variables are instantiated at the definition site (where the function is defined).

What is an existential type?

Basics. Existential types can be used for several different purposes. But what they do is to hide a type variable on the right-hand side. Normally, any type variable appearing on the right must also appear on the left: data Worker x y = Worker {buffer :: b, input :: x, output :: y}