Quiz

# GraphQL quiz

1) Which type marker means 'this field will never be null'?
   a) ?
   b) !
   c) +
   d) :nullable(false)

2) Connection-style pagination uses:
   a) page/limit
   b) offset
   c) edges + cursors + pageInfo
   d) since/until

3) Fragments help you:
   a) version the schema
   b) reuse field selections across queries
   c) hide deprecated fields
   d) escape sensitive data

4) Mutations should be:
   a) free-form
   b) named, ideally one logical action per mutation
   c) batched by the server
   d) only on POST

5) Top-level errors in the response are for:
   a) every domain error
   b) execution failures (parse, validation, resolver throw) - use payload UserError types for domain errors
   c) auth only
   d) never used

6) Persisted queries prevent:
   a) caching
   b) arbitrary or probing queries by clients
   c) introspection at runtime
   d) subscriptions

7) Subscriptions are typically delivered over:
   a) HTTP polling
   b) WebSocket (graphql-ws) or SSE
   c) gRPC
   d) email

8) Stable IDs in the schema let:
   a) the server skip auth
   b) clients dedupe + cache (Relay global IDs)
   c) prevent N+1
   d) skip pagination

Answers: 1b, 2c, 3b, 4b, 5b, 6b, 7b, 8b.

# 3 questions per lesson.