Your question is JavaScript Concepts Mastery. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
What are your experiences with JavaScript concepts like closures, promises, and scoping? Explain how lexical scoping determines variable lookup, how closures retain access to variables after the outer function returns, and how Promise callbacks are scheduled. Include a small example showing a practical use of a closure and asynchronous code. Compare Promise chaining with async/await, and mention a common mistake involving variable scope or rejected promises. The scope is modern JavaScript in browsers or Node.js, including let, const, var, Promise, and async functions.
