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GraphQL notes for developers

Master GraphQL with a curated set of 3 developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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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: I…

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!) { us…

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…

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TypeScriptgeneral

Interview Questions

TypeScript Interview Questions Comprehensive TypeScript interview questions covering type system, generics, utility types, and best practices: Fundamentals 1. What is TypeScript? TypeScript is a typed…

Mar 28, 2026
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TypeScriptgeneral

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 // Gener…

Mar 3, 2026
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