Variables

Question 1

What are Variables Types?

Answer 1

Numbers, Strings, Digits, underscores and dollar signs

Question 2

Variables Names rule 1

Answer 2

Names must begin with a letter

Question 3

Variables Names rule 2

Answer 3

Names can also begin with $ and _

Question 4

Is JavaScript case sensitive?

Answer 4

Yes. Example: y and Y are different variables

Question 5

Can reserved words be used

Answer 5

No. Example: (like JavaScript keywords) cannot be used as names

Question 6

What is an Assignment Operator sign

Answer 6

equal sign (=)

Question 7

what does the equal sign (=) mean?

Answer 7

“assignment” operator, not an “equal to” operator.

Question 8

Does the equal sign (=) mean “equal to” operator.

Answer 8

No. it’s a assignment operator only

Question 9

What can a variables hold?

Answer 9

Numbers and text

Question 10

What is a String?

Answer 10

A text values

Question 11

How is a string writing in javaScript?

Answer 11

Inside double “ “ or single quotes ‘ ‘

Question 12

Can you place a number within a string?

Answer 12

Yes, but it will be treated as a text string not a number.

Question 13

What is creating a Variable called?

Answer 13

“declaring” a variable.

Question 14

How do you write a variable in JavaScript?

Answer 14

var name = 1 and/or name = 1

Question 15

What is undefined?

Answer 15

The variable has no value

Question 16

How do you assign a value to a Variable?

Answer 16

use the equal sign
Example: var name = Jon;

Question 17

what is ==?

Answer 17

The “equal to” operator is written like == in JavaScript.

Question 18

case-sensitive

Answer 18

JavaScript identifiers are case-sensitive.

Question 19

Variables are

Answer 19

containers for storing data values

Question 20

good programming practice is

Answer 20

to declare all variables at the beginning of a script.

Question 21

one statement can have

Answer 21

can declare many variables 
Example: var person = "John Doe", carName = "Volvo", price = 200;

Question 22

Variables can span

Answer 22

multiple lines
Example: var person = "John Doe",
carName = "Volvo",
price = 200;

Question 23

Value

Answer 23

declared without a value

Question 24

variable declared without a value

Answer 24

undefined

Question 25

will re-declare a JavaScript variable lose it Value?

Answer 25

No, it will not lose its value.

Question 26

can you do arithmetic wit javascript variables?

Answer 26

yes, Example: var x = 5 + 2 + 3;

Question 27

Numbers in quotes?

Answer 27

he rest of the numbers will be treated as strings, and concatenated.