JavaScript: Operators & Keywords

Question 1

javascript keyword: var

Answer 1

declares a variable

Question 2

javascipt operator: =

Answer 2

assignment operator: used to assign a value to a variable

Question 3

javascript operator: + (Number)

Answer 3

addition operator: adds one value to another

Question 4

javascript operator: -

Answer 4

subtraction operator: subtracts one value from another

Question 5

javascript operator: /

Answer 5

division operator: divides two values

Question 6

javascript operator: *

Answer 6

multiplication operator: multiplies two values

Question 7

javascript operator: ++

Answer 7

increment operator: adds one to another value

Question 8

javascript operator: –

Answer 8

decrement operator: subtracts one from another value

Question 9

javascript operator: %

Answer 9

modulo operator: divides two values and returns the remainder

Question 10

javascript operator: + (String)

Answer 10

concatenation operator: joins two strings into one

Question 11

javascript operator: typeof

Answer 11

typeof operator: returns a string indicating the type of the unevaluated operand

Question 12

javascript operator: >

Answer 12

greater than relational operator: returns true if the left operand is greater than the right operand

Question 13

javascript operator: <

Answer 13

less than operator relational: returns true if the left operand is less than the right operand

Question 14

javascript operator: >=

Answer 14

greater than or equal to relational operator: returns true if the left operand is greater than or equal to the right operand

Question 15

javascript operator: <=

Answer 15

less than or equal to relational operator: returns true if the left operand is less than or equal to the right operand

Question 16

javascript operator: ==

Answer 16

equality operator: returns true if the operands are equal to each other

Question 17

javasctipt operator: !=

Answer 17

inequality operator: returns true if the operands are not equal to each other

Question 18

javascript operator: ===

Answer 18

strict equality operator: returns true if the operands are equal to each other with no type conversion

Question 19

javascript operator: !==

Answer 19

strict inequality operator: returns true if the operands are not equal to each other with no type conversion

Question 20

javascript operator: &&

Answer 20

logical AND operator: returns true if both operands evaluate to true

Question 21

javascript operator: ||

Answer 21

logical OR operator: returns true if either operand evaluates to true

Question 22

javascript operator: !

Answer 22

logical NOT operator: returns true if operand is false; returns false if operand is true

Question 23

javascript operator: condition ? expr 1 : expr 2

Answer 23

conditional operator: if true, it returns expr 1. if false, it returns expr 2