Object-Oriented Javascript and Prototypal Inheritance

Question 1

What is inheritance?

Answer 1

When one object gets access to the properties and methods of another object.

Question 2

What is classical inheritance?

Answer 2

It’s the way it’s been done for a long time - in C#, etc. But it’s very verbose,

Question 3

What is prototypal inheritance?

Answer 3

It is simple. It’s flexible, inheritable and extendable.

Question 4

What does reflection mean?

Answer 4

It means that an object can look at itself, listing and changing its properties and methods.

Question 5

What does this code return and why?

Answer 5

‘For in’ loops go through each property of an object in the same way a for loop can use length on an array. But, in this case it also went up to the prototype to get the function getFullName().

Question 6

What does this code return and why?

Answer 6

Because we’re using the hasOwnProperty method, this time the for in loop will only go through the immediate properties of its own object and not include the prototype’s properties.