javascript-prototypes

Question 1

What kind of inheritance does the JavaScript programming language use?

Answer 1

Prototype-based inheritance

Question 2

What is a prototype in JavaScript?

Answer 2

An object that contains properties and methods that can be used by other objects

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

The methods are defined on a prototype object and they borrow those methods when they are needed

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

Looks at the object’s prototype