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Test your knowledge of the SOLID principles in JavaScript. Each question includes a code snippet and multiple-choice answers. Choose the correct answer and learn about the principle being applied or violated.

Master the DRY (Don't Repeat Yourself) and KISS (Keep It Simple, Stupid) principles in JavaScript with this comprehensive quiz covering code organization, maintainability, and best practices for writing clean, efficient code.

Master Factory and Constructor Functions in JavaScript with this comprehensive quiz covering object creation patterns, encapsulation, prototype inheritance, and best practices for building flexible and maintainable object-oriented code.

Master clean and maintainable coding practices in JavaScript with this comprehensive quiz covering naming conventions, SOLID principles, and best practices for writing efficient and readable code.

Master Observer and Singleton design patterns in JavaScript with this comprehensive quiz covering event handling, state management, dependency relationships, and best practices for implementing robust architectural patterns.

Master JavaScript security best practices with this comprehensive quiz covering XSS prevention, CSRF protection, secure authentication, input validation, and essential techniques for writing secure web applications.

Master JavaScript performance optimization techniques with this comprehensive quiz covering best practices for writing efficient code, memory management, DOM manipulation, and application performance optimization strategies.