javascript-01

Question 1

variable data types

Answer 1

number, string, boolean, null, object

Question 2

number

Answer 2

any numeric value

Question 3

string

Answer 3

any string of alphanumeric characters

Question 4

Boolean

Answer 4

True or flase values only

Question 5

null

Answer 5

special keyword for the null value

Question 6

object

Answer 6

a reference to a JavaScript object

Question 7

literals

Answer 7

Actual data values you provide to JavaScript

1. integer literal
2. floating-point literal
3. string literal

Question 8

Rules for naming variables

Answer 8

• Names can contain letters, digits, underscores, and dollar signs.
• Names must begin with a letter
• Names can also begin with $ and _

Question 9

How to declare a variable

Answer 9

by using the var keyword

Question 10

javaScript is case sensitive, true or false?

Answer 10

true

Question 11

what are the JavaScript Expressions

Answer 11

Assignment, Arithmetic, String, logical

Question 12

Assignment

Answer 12

assigns a value to a variable

Question 13

what is arithmetic expression

Answer 13

evaluates to a number

Question 14

What is the String expression

Answer 14

evaluates to a string

Question 15

what is the logical expression

Answer 15

evaluates to true or false

Question 16

what are operators

Answer 16

used in expressions to store or return a value

Question 17

=

Answer 17

assigns the value of the right operand to the left operand

Question 18

+=

Answer 18

add together the operands and assigns the result to the left operand

Question 19

-=

Answer 19

subtracts the right operand from the left operand and assigns the result to the left operand

Question 20

*=

Answer 20

multiplies the operands and assigns the result to the left operand

Question 21

/=

Answer 21

divides the left operand by the right operand and assigns the result to the left operand

Question 22

%=

Answer 22

divides the left operand by the right operand and assigns the remainder to the left operand

Question 23

+

Answer 23

adds the operands together

Question 24

-

Answer 24

substracts the right operand from the left operand

Question 25

*

Answer 25

multiplies the operands

Question 26

/

Answer 26

divides the operands

Question 27

%

Answer 27

divides the operands and calculates the remainder

Question 28

&&

Answer 28

logical "and", evaluates to true when both operand is true

Question 29

||

Answer 29

logical "or", evaluates to true when either operands is true

Question 30

!

Answer 30

logical "not", evaluates to true if the operand is false, to false if the operand is true

Question 31

==

Answer 31

evaluates to true if the operands are equal

Question 32

!=

Answer 32

evaluates to true if the operands are not equal

Question 33

>

Answer 33

evaluates to true if the left operand is bigger then the right operand

Answer 34

evaluates to true if the left operand is less then the right operand

Question 35

>=

Answer 35

left bigger than or equal to right

Question 36

<=

Answer 36

left smaller than or equal to right

Question 37

+ (string)

Answer 37

combines the operands to a single string

Question 38

operator: (condition) ? val1 : val2

Answer 38

evaluates to one of two different values base on a condition

Question 39

++

Answer 39

increases the value of the supplied operand by one

Question 40

- (unary)

Answer 40

negates the value of the operand

Question 41

-- (unary)

Answer 41

decreases the value of the supplied operand by one