Lesson 06 · 12 min
enum, input, interface, union
Types that make a schema precise: limited values, input objects, shared fields.
12 minLesson 6 of 9Practice includedAsk AI on any point
enum limits a field to a list of values. input is an object for arguments: a regular type can't be used in arguments. interface describes shared fields that several types have. union says "one of these types here" with no shared fields. To get the fields of a specific type from an interface or union, a query uses an inline fragment ... on Book, and __typename tells you what came back.
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