Lesson 4: More Functions

Question 1

What is a Variable Scope?

Answer 1

The range of JavaScript code in which a variable is visible / accessible.

Question 2

Global Variables are:

Answer 2

Declared with var outside of any function.

Question 3

Local Variables are:

Answer 3

Declared with var in a function only visible in the function.

Question 4

What does the ‘this’ keyword refer to?

Answer 4

The object that the event handler is attached to.

Question 5

What is Hoisting?

Answer 5

Moving a variable and function declarations to the top of the current scope.

Question 6

What should be used instead of Variable Hoisting?

Answer 6

let and const

Question 7

What are Arrow Functions?

Answer 7

Simplified notation for anonymous functions.

Question 8

Show an example of Arrow Functions:

Answer 8

var sayHello= () => alert(‘Hello’);

Question 9

What are Default Parameters?

Answer 9

Values used by the function if no arguments are provided when it’s invoked.

Question 10

What does a const declaration do?

Answer 10

Creates a constant-a value that can’t be changed by reassignment or redeclaration.