Curriculum Interfaces & generics Generics exercise 4 · fill-word
Generics
Type the constraint that allows ANY type as the type parameter. This is the constraint you reach for when the function body doesn't need to know anything about T — e.g. an identity function or a generic container.
TypeScript reference
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About this theme
Mostly familiar from TS. func Foo[T any](x T) T { ... }. The constraint syntax is where Go adds something new: an interface used as a constraint can list types or use ~T for "any type whose underlying type is T". The comparable constraint is built-in. Method sets in constraints are powerful and worth slowing down on.