Object Oriented JavaScript & Prototypal Inheritance

Question 1

Inheritance

Answer 1

One object gets access to the properties and methods of another object. (There’s an object and another object, an the other object can get access to the first object’s methods and properties.)

Question 2

Classical Inheritance

Answer 2

Verbose. A large collection of object’s properties and methods.

Question 3

Prototypal Inheritance

Answer 3

Simpler than classical inheritance. It’s flexible, extensible, and easier to understand.

Question 4

Objects can have

Answer 4

properties and methods.

Question 5

Everything in JavaScript except for _____ are objects.

Answer 5

primitives: numbers, strings, booleans, undefined, null.

Question 6

Reflection

Answer 6

An object can look at itself, listing and changing its properties and methods.

Question 7

Every constructor we initialize gets a free ______ object as one of its properties.

Answer 7

prototype

Question 8

What is object-oriented programming?

Answer 8

Objects interacting with one another through methods and properties. Used to store data, structure applications into modules and keeping code clean.

Question 9

Constructors act like a ________.

Answer 9

blueprints

Question 10

Inheritance is made possible because of the ______ that every object has.

Answer 10

prototype

Question 11

How does inheritance actually work?

Answer 11

prototype chain. When you try to access method or property on a object, JS will first try to find it in that object.. if it can’t find it, then it looks at the parent’s object, if the method is still not there, it continues to look at the upper objects until it’s null/undefined.

Question 12

Every JavaScript object has a ______ _____, which makes inheritance possible in JavaScript.

Answer 12

prototype property

Question 13

The prototype property of an object is where we put methods and properties that we want other objects to _____.

Answer 13

inherit

Question 14

The constructor’s prototype property is NOT the prototype of the Constructor itself, it’s the prototype of ALL _______ that are created through it.

Answer 14

instances

Question 15

When a certain method (or property) is called, the search starts in the object itself, and if it cannot be found, the search moves on to the object’s prototype. This continues until the method is found. This is called?

Answer 15

The prototype chain

Question 16

What type of object is this?

let john = {
  name: 'john',
  yearOfBirth: 1990,
  job: 'teacher'
};

Answer 16

object literal

Question 17

function constructor’s variable name always starts with a…

Answer 17

capital

Question 18

what does the new operator do?
new Person();

Answer 18

a new empty object is created then the function is called

Question 19

Reflection

Answer 19

An object can look at itself, listing and changing its properties and methods.

Question 20

_.extend

Answer 20

??