Modern JavaScript from the Beginning - Second Edition - Adding Methods to the Prototype

The video tutorial explains the concept of prototypes in JavaScript, focusing on how they allow methods and properties to be added to objects efficiently. It demonstrates adding methods like 'area', 'perimeter', and 'isSquare' to a rectangle prototype, showing how these methods can be accessed by any instance of the rectangle. The tutorial also covers testing these methods and creating new instances to illustrate the benefits of using prototypes.

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