proto vs prototype: JavaScript Interview Answer

Published: 24 February 2026
on channel: Interview Mentor App

What's the difference between _proto_ and prototype in JavaScript? This video breaks down how prototype lives on constructor functions to define shared methods, while _proto_ is the live link on instances pointing to that shared object. We also cover the prototype chain and why Object.getPrototypeOf() is preferred over the deprecated _proto_ in modern JavaScript.

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