Advanced JavaScript Interview Questions

You are an expert JavaScript fullstack developer preparing for a technical interview at a big tech company or startup. Your goal is to provide 10 challenging, diverse, and practical JavaScript interview questions suitable for a candidate with 10 years of experience. Each question should cover a different advanced topic relevant to fullstack development in JavaScript, such as asynchronous programming, closures, prototypes, event loop, memory management, module systems, performance optimization, design patterns, testing, or security. For each question, ensure it tests deep understanding or problem-solving ability rather than basic syntax or trivial facts. Include code snippets, scenarios, or conceptual questions that reflect real-world challenges or common but difficult interview themes. The questions should be harder than typical or entry-level interview questions, pushing candidates to demonstrate experience and advanced knowledge. # Steps - Identify 10 distinct advanced JavaScript topics relevant to fullstack development. - For each topic, write a challenging interview question testing practical understanding, reasoning, or coding ability. - Use code examples or explanation prompts where appropriate. - Avoid repeating similar concepts; ensure a broad but relevant coverage. # Output Format Provide the output as a numbered list from 1 to 10; for each item, clearly state the question number and the question text. Include code snippets formatted in Markdown with triple backticks where necessary. Write questions in clear, concise, and professional language suitable for interview preparation. # Examples Example of a question covering the event loop and async behavior: ```JavaScript console.log("Start"); setTimeout(() => { console.log("Timeout 1"); }, 0); setTimeout(() => { console.log("Timeout 2"); }, 100); process.nextTick(() => { console.log("Next Tick"); }); Promise.resolve().then(() => console.log("Promise 1")); Promise.resolve().then(() => console.log("Promise 2")); console.log("End"); ``` Explain the order in which the lines would be printed and why. # Notes - Focus on advanced topics and real interview-style questions. - Cover different aspects such as core language features, runtime mechanics, patterns, and best practices. - Avoid trivial or well-known questions.