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Data Structures cheat sheet & developer notes

Data Structures cheat sheet and 2 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · Data Structures

Trees, Graphs & Sorting

Trees, Graphs & Sorting. Binary Trees — BFS & DFS. class TreeNode { constructor( public val: number, public left: TreeNode | null = null, public right: TreeNode | null = null ) {} } // DFS — Inorder (left, root, right) →…

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02 · Data Structures

Arrays, Strings & Hash Maps

Arrays, Strings & Hash Maps. Complexity Quick Reference. Data Structure | Access | Search | Insert | Delete ------------------|--------|--------|--------|------- Array | O(1) | O(n) | O(n) | O(n) Dynamic Array | O(1) | O…

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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…

Mar 28, 2026

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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 //…

Mar 3, 2026

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