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Refactoring cheat sheet & developer notes

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

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01 · Refactoring

Definition, Safety Net & Core Techniques

Definition, Safety Net & Core Techniques. The Definition That Matters. Refactoring changes internal structure WITHOUT changing external behavior. A bug fix or a new feature — even one that also reorganizes code — is not,…

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02 · Refactoring

Code Smells & When (Not) to Refactor

Code Smells & When (Not) to Refactor. Duplicated Code. The same logic in multiple places means a bug fix must be applied everywhere it's duplicated — easy to miss one spot. DRY-motivated refactorings (Extract Method, pul…

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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…

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 //…

Mar 3, 2026

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