What are prototype chains in JavaScript?

Can you explain what prototype chains are in JavaScript?

Sure! In JavaScript, prototype chains are a mechanism for object inheritance. Every object has a prototype, which is another object from which it can inherit properties and methods.

How does the prototype chain work when I create an object?

When you create an object, it has an internal link to its prototype. If you try to access a property that doesn't exist on the object, JavaScript looks up the prototype chain until it finds the property or reaches the end of the chain.

Can you give me an example of a prototype chain?

Absolutely! For instance, if you have an object dog that inherits from animal, and animal has a method bark, calling dog.bark() will work because JavaScript finds bark in the prototype chain.

What happens if a property is not found in the prototype chain?

If a property is not found in the prototype chain, JavaScript returns undefined. You can also check if a property exists using the in operator.