JavaScript Operators

JavaScript operators perform operations on operands. Operators are used to do logical and arithmetic operations. Operators that require one operand are called unary operator and operator with two operand is known as binary operator.

For example:

1. var sum= 55+80;

In this example the plus (+) is the arithmetic operator and equal to (=) is the assignment operator.

Operators in JavaScript:

1. Arithmetic Operators
2. Assignment Operators
3. Bitwise Operators
4. Special Operators
5. Logical Operators
6. Comparison Operators

JavaScript Arithmetic Operators

Arithmetic operators include addition , subtraction, multiplication operations ,Arithmetic operators are mostly used for numeric operands.
These operators are mainly used in mathematical expressions in the same way as they are used in algebra. check the following Example of  Arithmetic Operators.

Var num1=15, num2=5;

Operator	Description	Example	Result
+	Addition	num1+num2	20
–	Subtraction	num1-num2	10
*	Multiplication	num1*num2	60
/	Division	num1/num2	3
%	Modulus (Remainder)	num1%num2	0

JavaScript Comparison Operators

To do comparison between two operands Javascript comparison operator is used . 

Following are the examples of the comparison operators:

Var num1=5, num2=15;

Operator	Description	Example	Result
==	Is equal to	num1==num2	false
!=	Not equal to	num1!=num2	true
!==	Not Identical	num1!==num2	false
>	Greater than	num1>num2	true
>=	Greater than or equal to	num1>=num2	true
<	Less than	num1<num2	false
<=	Less than or equal to	num1<=num2	false

JavaScript Bitwise Operators

The bitwise operator works on two operands. The bitwise operators are as follows:

Var num1 = 5, num2 = 10 , num3 = 40;

Operator	Description	Example	Result
&	Bitwise AND	(num1==num2 & num2==num3)	false
|	Bitwise OR	(num1==num2 | num2==num3)	false
^	Bitwise XOR	(num1==num2 ^ num2==num3)	false
~	Bitwise NOT	(~num1)	-5

JavaScript Logical Operators

Logical operators are used to verify more than one condition at a time or to negate the condition .it has three logical operators.

Var num1 = 5, num2 = 10 , num3 = 40;

Operator	Description	Example	Example
&&	Logical AND	(num1==num2 && num1==num2)	false
||	Logical OR	(num1==num2 || num2==num3)	false
!	Logical Not	!(num1==num2)	true

JavaScript Assignment Operators

It is very important to know that assignment operator is not ‘equal to ‘ operator .The assignment operator is used to assign a value of an expression to a variable.

Check the following JavaScript assignment operators.

Operator	Description	Example with results
=	Assign	20+40 = 60
+=	Add and assign	var num1=20; num1+=20; Now num1 = 40
-=	Subtract and assign	var num1=40; num1-=20; Now num1 = 10
*=	Multiply and assign	var num1=10; num1*=40; Now num1 = 400
/=	Divide and assign	var num1=20; a/=5; Now num1 = 4
%=	Modulus and assign	var num1=10; num1%=2; Now num1 = 0

JavaScript Special Operators

The following are the examples of JavaScript special operators.

Operator	Description
delete	It is used for deleting a property from the giving object.
instanceof	Using this operator checks instanceof type giving object.
new	This operator is used to create an instance object.
typeof	This operator is used to check the type of object.
void	This operator discards the return value of expression.
yield	This is return the value of generator’s iterator

JavaScript Variable