Test Your JavaScript Knowledge 2
Ready to push your JavaScript expertise to the next level?
This quiz dives deep into advanced concepts, modern frameworks, and best practices. Test your understanding of:
- Event delegation, throttling, and debouncing
- Memoization, dynamic programming, and the event loop
- Popular build tools, virtual DOM libraries, and state management
- PWAs, TypeScript, curry, and immutability
- Advanced testing practices, memory management, web APIs, and accessibility features
Challenge yourself and discover areas for improvement!
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How many questions about JavaScript can you answer? JavaScript Questions with Answers
Advanced JavaScript Concepts:
Explain the concept of event delegation in JavaScript.
Answer: Event delegation allows attaching a single event listener to a parent element and handling events triggered by child elements.
What is throttling and debouncing in JavaScript and how are they different?
Answer:
Throttling: Limits the execution of a function to a specific rate.
Debouncing: Delays the execution of a function until a specified period of inactivity.
What are memoization and dynamic programming in JavaScript?
Answer:
Memoization: Caches the results of a function to avoid repeated calculations.
Dynamic programming: Optimizes solutions by storing and reusing sub-problems.
Explain the concept of the event loop and how it works in JavaScript.
Answer: The event loop handles javascript execution by processing events and tasks in a queue.
What are web workers in JavaScript and how are they used?
Answer: Web workers are background threads that allow JavaScript code to run concurrently without blocking the main thread.
Modern JavaScript:
What are some popular JavaScript build tools and their functionalities?
Answer: Webpack, Rollup, Parcel. Bundling, minification, code splitting.
What are the benefits of using virtual DOM libraries in JavaScript?
Answer: Improves performance by minimizing DOM manipulation.
Explain the concept of state management in JavaScript applications.
Answer: Libraries like Redux and MobX help manage application state and ensure consistent data across components.
What are progressive web apps (PWAs) and how are they built?
Answer: Offline-capable web apps that utilize service workers and manifest files.
What is the purpose of using TypeScript with JavaScript?
Answer: Adds static typing to JavaScript, improving code clarity and preventing runtime errors.
Bonus JavaScript Questions:
What is curry in JavaScript and how is it used?
Answer: Curry breaks down a function into smaller functions with multiple arguments.
Explain the concept of immutability in JavaScript.
Answer: Data cannot be modified after creation, ensuring data consistency.
What is the difference between class and constructor in JavaScript?
Answer: class defines the blueprint for an object, while constructor initializes the object with properties and methods.
What are generators and iterators in JavaScript?
Answer:
Generators: Functions that can pause and resume execution.
Iterators: Objects that provide a sequence of values.
What are some advanced testing practices in JavaScript?
Answer: Mocking, coverage reports, end-to-end testing, TDD (Test-Driven Development).