What is tail call optimization?

Short answer: Follow me on LinkedIn: When a function’s final action is calling another function, JS can reuse the stack frame to avoid overflow. Example: function factorial(n, acc = 1) { if (n === 0) return acc;

Example code

return factorial(n - 1, n * acc); // Tail call
}

Real-world example (ShopNest)

ShopNest’s browser cart uses modern JavaScript: fetch APIs with async/await, modules, and clear error handling.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.