Curriculum Interfaces & generics Generics exercise 3 · mcq
Generics
TypeScript constrains a generic with a union of literal types
or a base interface. Go uses a TYPE SET constraint — a
union of TYPES, separated by |, written inline as the
constraint expression OR named as an interface.
Pick the Go form that constrains T to either int OR
float64.
TypeScript reference
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.