It’s important to note that the prototype is “live”. Objects are passed by reference in JavaScript, and therefore the...

It’s important to note that the prototype is “live”. Objects are passed by reference in JavaScript, and therefore the prototype is not copied with every new object instance. What does this mean in practice? It means that you can modify the prototype at any time and all objects (even those created before the modification) will inherit the changes.

– Using Prototype Property in JavaScript