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What is function scope?

Q: What is function scope?

Short answer: Variables declared inside a function are accessible only within that function. Example code function demo() { let x = 10; console.log(x); // 10 } console.log(x); // ReferenceError Real-world example (ShopNest) In ShopNest’s cart UI, a click handler closes over productId . Use let in loops so each button keeps the correct id. Say this in the interview Define — one clear sentence (the short answer above). Example — relate it to a project like ShopNest or your real work. Trade-off — when you would not use it.

Short answer: Variables declared inside a function are accessible only within that function.

Example code

function demo() { let x = 10; console.log(x); // 10 } console.log(x); // ReferenceError

Real-world example (ShopNest)

In ShopNest’s cart UI, a click handler closes over productId. Use let in loops so each button keeps the correct id.

Say this in the interview

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

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