Junior From PDF JavaScript JavaScript

What is an event listener?

Q: What is an event listener?

Short answer: An event listener waits for user actions (like clicks or keypresses) and runs a function when the event occurs. Example code button.addEventListener("click", () => alert("Clicked!")); 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 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: An event listener waits for user actions (like clicks or keypresses) and runs a function when the event occurs.

Example code

button.addEventListener("click", () => alert("Clicked!"));

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

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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