Javascript Prototypes

Question 1

What kind of inheritance does the JavaScript programming language use?

Answer 1

Parent organisms give traits to their offspring through their DNA. JavaScript includes a specific kind of inheritance known as prototype-based (or prototypal) inheritance. JavaScript objects give certain behaviors (methods) or data (properties) to other objects.

Question 2

What is a prototype in JavaScript?

Answer 2

As mentioned before, a JavaScript prototype is simply an object that contains properties and (predominantly) methods that can be used by other objects. An object on which another object is based.

Question 3

How is it possible to call methods on strings, arrays, and numbers even though those methods don’t actually exist on strings, arrays, and numbers?

Answer 3

They are baked in through prototypes which define the functions, inheritance from objects

Question 4

If an object does not have it’s own property or method by a given key, where does JavaScript look for it?

Answer 4

prototype, if that prototype doesnt have it then the next prototype and so on. it is inherited