General · Learning hub

OOP cheat sheet & developer notes

OOP cheat sheet and 5 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

Save this stack to your DevRecall Test yourself — OOP quiz More General notes

01 · OOP

Design Patterns

Common OOP Design Patterns. Design patterns are reusable solutions to common problems in software design. They represent best practices evolved over time.. Singleton Pattern. Ensures a class has only one instance and pro…

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02 · OOP

Best Practices

OOP Best Practices. Follow these best practices to write clean, maintainable, and effective object-oriented code.. 1. Single Responsibility Principle. A class should have only one reason to change - it should do one thin…

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03 · OOP

Core Principles

Object-Oriented Programming: Core Principles. Object-Oriented Programming (OOP) is a programming paradigm based on the concept of "objects" that contain data and code. It organizes software design around data, or objects…

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04 · OOP

Classes and Objects

Classes and Objects. Classes are blueprints for creating objects. Objects are instances of classes that contain actual data and can perform actions.. Defining a Class. A class typically contains properties (data) and met…

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05 · OOP

Inheritance and Polymorphism

Inheritance and Polymorphism. Master advanced OOP concepts that enable code reuse and flexible design through inheritance hierarchies and polymorphic behavior.. Inheritance Hierarchies. Inheritance creates a parent-child…

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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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