Operator in JavaScript

What is an operator?

JavaScript has both binary and unary operators, and one special ternary operator, the conditional operator. A binary operator requires two operands, one before the operator and one after the operator:

operand1 operator operand2
For example, 3+4 or x*y.

A unary operator requires a single operand, either before or after the operator:

operator operand
or
operand operator
For example, x++ or ++x.

Let us take a simple expression 5 + 5 is equal to 10. Here 5 and 5 are called operands and ‘+’ is called the operator.
JavaScript supports the following types of operators.

• Arithmetic Operators
• Comparision Operators
• Logical (or Relational) Operators
• Assignment Operators
• String Operators
• Conditional (or ternary) Operators

Using this operator we easly add,subtract,multiply,divide etc like see in example. Operator Description Example Result.

Arithmetic Operators

Operator	Description	Example	Expression	Result
+	Addition	x=2 y=2	x+y	4
-	Subtraction	x=5, y=3	x-y	2
*	Multiplication	x=5,y=5	x*y	25
/	Division	x=15,y=5	x/y	3
%	Modulus (division remainder)	x=5,y=2	x%y	1
++	Increment	x=5	x++	6
--	Decrement	x=5	x--	4

Comparison Operators

Operator	Description	Example
==	is equal to	5==8 returns false
===	is equal to (checks for both value and type)	x=5,y="5" x==y returns true x===y returns false
!=	is not equal	5!=8 returns true
>	is greater than	5>8 returns false
>=	is Greter than equal	5 >=8 returns false
<	is Less than	5 <8 returns true
<=	is Less than equal	5 <=8 returns true

Logical Operators

Operator	Description	Example
&&	and	x=6 y=3 (x < 10 && y > 1) returns true
||	or	x=6 y=3 x==5 || y==5) returns false
!	Not	x=5 y=2 !(x==y) returns true

Assignment Operators

In this opertor You can assign value in variable in javascript

Syntex -    var x= value;

Example - var x = 5;

=  this is Assign Operator you can assign any value using this operator. In this example assign 5 value in x variable and use this

String Operators

A string is most often text, for example "Hello World!". To stick two or more string variables together, use the + operator.

txt1="How a very";
txt2="nice flower
txt3=txt1+txt2;

The variable txt3 now contains "How a verynice flower!". To add a space between two string variables, insert a space into the expression, OR in one of the strings.

txt1="How a very";
txt2="nice flower!";
txt3=txt1+" "+txt2;
or
txt1="How a very ";
txt2="nice flower!";
txt3=txt1+txt2;

The variable txt3 now contains "How a very nice flower!".

Conditional Operators

JavaScript also contains a conditional operator that assigns a value to a variable based on some condition.

Syntax
variablename=(condition)?value1:value2
Example
greeting=(visitor=="PRES")?"Dear President ":"Dear ";

If the variable visitor is equal to PRES, then put the string "Dear President " in the variable
named greeting. If the variable visitor is not equal to PRES, then put the string "Dear " into the variable named greeting.