General · Learning hub

GraphQL cheat sheet & developer notes

GraphQL cheat sheet and 4 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · GraphQL

GraphQL Interview Questions

GraphQL Interview Questions. GraphQL vs REST? GraphQL: single endpoint, client specifies exact data needed (no over/under-fetching), strong typing, introspection, ideal for complex UIs. REST: multiple endpoints, simpler …

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02 · GraphQL

Schema & Types

Schema & Types. Type System. # Scalar types String Int Float Boolean ID # Custom scalars scalar DateTime scalar JSON scalar Upload # Object type type User { id: ID! # ! = non-nullable email: String! name: String! bio: St…

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03 · GraphQL

Queries, Mutations & Apollo Client

Queries, Mutations & Apollo Client. Writing Queries. # Basic query query GetUser { user(id: "1") { id name email } } # With variables query GetUser($id: ID!) { user(id: $id) { id name email posts(limit: 5) { id title } }…

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04 · GraphQL

Interview Questions

GraphQL Interview Questions. Q: What is GraphQL and how does it differ from REST?. GraphQL is a query language and runtime for APIs. Key differences from REST: (1) Single endpoint vs multiple endpoints. (2) Client specif…

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Interview Questions

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Advanced Types (Generics & Utility Types)

TypeScript Advanced Types. Generics. // Generic function function identity<T>(arg: T): T { return arg; } const num = identity<number>(42); // Explicit const str = identity('hello'); // Inferred //…

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