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What is the prototype chain?

Q: What is the prototype chain?

Short answer: The prototype chain is the chain of objects that JavaScript follows to look up properties or methods. If a property isn’t found on the object itself, JS checks the object's prototype, and continues up the chain. Example code console.log(child.toString()); // from Object.prototype Real-world example (ShopNest) Prefer arrow functions for React/event callbacks in ShopNest so this is not accidentally rebound. 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: The prototype chain is the chain of objects that JavaScript follows to look up properties or methods. If a property isn’t found on the object itself, JS checks the object's prototype, and continues up the chain.

Example code

console.log(child.toString()); // from Object.prototype

Real-world example (ShopNest)

Prefer arrow functions for React/event callbacks in ShopNest so this is not accidentally rebound.

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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