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JavaScript Operators

JavaScript operator is used to performing some operation on single or multiple operands and to produce results.
Let’s consider the following simple expression 3 + 4 = 7. Here 3 and 4 are called operands and ‘+’ is called the operator.
JavaScript supports the following types of operators.

Types of operators in JavaScript:

  • Arithmetic Operators
  • Comparison Operators
  • Logical Operators
  • Assignment Operators
  • Conditional Operators

Arithmetic Operators:

Arithmetic operators are used for performing mathematical operations on the operands. 
Following are the JavaScript arithmetic operators:
Operator Description Example
+ Addition 20+40 = 60
- Subtraction 40-20 = 20
* Multiplication 20*40 = 800
/ Division 40/20 = 2
% Modulus (Remainder) 40%20 = 0
++ Increment var a=20; a++; Now a = 21
-- Decrement var a=20; a--; Now a = 19

Comparison Operators:

The JavaScript comparison operator is used to compare the two operands.
Following are the JavaScript comparison operators:
Operator Description Example
== Is equal to 20==40 = false
=== Identical (equal and of same type) 20==40 = false
!= Not equal to 20!=40 = true
> Greater than 40>20 = true
>= Greater than or equal to 40>=20 = true
< Less than 40<20 = false
<= Less than or equal to 40<=20 = false

Logical Operators:

JavaScript logical operators are used to combine two or more conditions.
Following are the JavaScript logical operators:
Operator Description Example
&& Logical AND (20==40 && 40==44) = false
|| Logical OR (20==40 || 40==43) = false
! Logical Not !(20==40) = true

Assignment Operators:

JavaScript assignment operators are used to assign values to variables with fewer keystrokes.
Following are the JavaScript assignment operators:
Operator Description Example
= Assign 20+20 = 40
+= Add and assign var a=20; a+=30; Now a = 40
-= Subtract and assign var a=40; a-=30; Now a = 30
*= Multiply and assign var a=20; a*=40; Now a = 800
/= Divide and assign var a=20; a/=2; Now a = 10
%= Modulus and assign var a=20; a%=2; Now a = 0

Ternary Operator:

JavaScript includes a special operator called ternary operator :? that assigns a value to a variable depend on some condition. This is like a short form of the if-else condition.

Syntax:

<condition> ? <value1> : <value2>;
The ternary operator starts with a conditional expression followed by ? operator. Second part ( after ? and before : operator) will be executed when the condition turns out to be true. If the condition comes false then the third part (after :) will be executed.

Example:

var a = 20, b = 10;
var c = a > b? a : b; // value of c would be 20
var d = a > b? b : a; // value of d would be 10
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