Operators

Variables are used for storing values or expressions.

Assignment Operators

JavaScript supports the following assignment operators:

Operator	Description
=	Assignment
+=	Add and assign
-=	Subtract and assign
*=	Multiply and assign
/=	Divide and assign
%=	Modulus and assign

Arithmetic Operators

JavaScript supports the following arithmetic operators:

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

In JavaScript, the '+' operator is overloaded; it is used for string concatenation, arithmetic addition, and also to convert strings to numbers.

String Concatenation

To add two or more string variables together, use the + operator:

msg1 = "First Message.";
msg2 = "Second Message.";
output = msg1 + " " + msg2;

After these statements execute, output would contain:

Adding Strings and Numbers

When adding a number and a string in JavaScript, the result will always be a string:

sum = 50 + 50;
// sum contains 100 (a number)

sum = "50" + 50;
// sum contains "5050" (a string)