Operator

Arithmetic Operators

Operator	Description
+	Addition
-	Subtraction
*	Multiplication
/	Division
%	Modulus (remainder of a division)
++	Increment
--	Decrement

Assignment Operators

Operator	Description
=	Assign
+=	Add and assign. For example, x+=y is the same as x=x+y.
-=	Subtract and assign. For example, x-=y is the same as x=x-y.
*=	Multiply and assign. For example, x*=y is the same as x=x*y.
/=	Divide and assign. For example, x/=y is the same as x=x/y.
%=	Modulus and assign. For example, x%=y is the same as x=x%y.

Comparison Operators

Operator	Description
==	Is equal to
===	Is identical (is equal to and is of the same type)
!=	Is not equal to
!==	Is not identical
>	Greater than
>=	Greater than or equal to
<	Less than
<=	Less than or equal to

Logical/boolean Operators

Operator	Description
&&	and
||	or
!	not

String Operators

In JavaScript, a string is simply a piece of text.

Operator	Description
=	Assignment
+	Concatenate (join two strings together)
+=	Concatenate and assign

You will learn how to use some of the most common of these JavaScript operators in the following pages.

https://www.quackit.com/javascript/tutorial/javascript_operators.cfm