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Refactoring notes for developers

Master Refactoring with a curated set of 2 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, s…

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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, pulli…

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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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