JavaScript

Question 1

What is a variable?

Answer 1

A variable is a container that stores data

Question 2

Why are variables useful?

Answer 2

Variables can store data, and be used multiples times within code

Question 3

What two special characters can a variable begin with?

Answer 3

$ and _

Question 4

How do you declare a variable?

Answer 4

use the keyword “var”

Question 5

How do you assign a value to a variable?

Answer 5

Use the “=”

Question 6

Are variables case sensitive?

Answer 6

Yes

Question 7

Which words cannot be used as variable names?

Answer 7

keywords such as function, console, etc

Question 8

What is a string?

Answer 8

Form of data stored within quotation marks

Question 9

What is the string concatenation operator?

Answer 9

’+’

Question 10

What is the difference when it comes to using single or double quotes?

Answer 10

No difference

Question 11

How do you use escape quotation characters?

Answer 11

need to put a “"

Question 12

What is type coercion?

Answer 12

Type coercion is the process of converting one value to another type

Question 13

What is a number in Javascript?

Answer 13

Any number

Question 14

What is an arithmetic operator?

Answer 14

Any of the operators that perform arithmetic

Question 15

Name four of the arithmetic operators:

Answer 15

1. +
2. -
3. *
4. /

Question 16

What is the order of execution?

Answer 16

PEMDAS

Question 17

What is a boolean?

Answer 17

A boolean is a primitive data type that is either true or false

Question 18

What is a comparison operator?

Answer 18

it is the < or > sign (or the combined signs of ‘or equals to’)

Question 19

What is the difference between undefined and null?

Answer 19

Undefined has yet to be defined, while null means that there is no value.

Question 20

What is a function?

Answer 20

A function is a block of code that can perform a particular task.

Question 21

Why are functions useful?

Answer 21

You can call the function to perform its needed task instead of writing the same code over and over

Question 22

How do you call a function?

Answer 22

Write the function name, followed by ();

Question 23

What are the parts of a function definition?

Answer 23

function keyword, function name (and parameters if needed), and the code block

Question 24

What is the difference between a parameter and an argument?

Answer 24

Argument is the data you pass in, parameter is the data is that is declared when the function is defined