JavaScript operators

             

     JavaScript Operators 

  

1] Arithmetic Operators 

2]  Assignment Operators

3] Comparison Operators   

4] String Operators   

5]  Logical Operators

6] Bitwise Operators

7] Ternary Operators

1] Arithmetic Operators JavaScript 

    1] Addition (+)

    2]  Subtraction (-)

    3] Multiplication  (*)

    4] Exponentiation (**)

    5] Division  (/)

    6]  Modulus   (%)

    7]   Increment  (++)

     8]  Decrement (--)

  

         Example :-

  

Operators	Name	Example	Result
+	Addition	6+2	8
-	Subtraction	6 - 2	4
*	Multiplication	6 * 2	12
**	Exponentiation	2 **3	8
/	Division	6 / 2	3
%	Modulus	7 % 3	1
++	Increment	6 ++	7
_ _	Decrement	6 - -	5

2]  Assignment Operators JavaScript

   1]  Assignment (=)

    2]   Addition Assignment (+ = )

    3]  Subtraction Assignment (- =)

    4] Multiplication Assignment (* =)

    5] Division Assignment (/ =)

    6] Remainder Assignment  (% =)

    Example :-

3] Comparison Operators JavaScript   

    1] Equal  to  (==)

   2]  Equal value and equal type (= = =)

   3] Not equal (! =)

   4] Not equal value or not equal type (! = =)

   5] Greater than ( > )

   6] less than (< )

   7] Greater than or equal to (> = )

   8] less than or equal to (< =)

 Example :-

4] String Comparison  

 String  comparison operators use compare two strings to determine

 Relative equality 

   1]  Equality (= =)

   2] Inequality ( ! =)

    3] Greater than ( > )

    4] Greater than or equal to (>= ) 

    5]  Less than (< )

    6] Less than  or equal to ( <= )

   Example :-

5]  Logical Operator JavaScript

  1]  logical and (&&)

  2] logical or ( | | ) 

  3]  logical ( ! )

Logical Operator 

Example :-

6] Bitwise Operators

1]  AND  ( & )

2] OR ( | )

3] NOT ( ~ )

4] XOR ( ^)

5] left  shift ( << )

6] right shift ( >>)

Bitwise Operators

Example :-

7] Ternary Operators

 1] condition 

 2] expression_if_true

  3] expression_if_false 

Syntax  :=

  condition  ? expression_if_true : expression_if_false

Example :-

let age =18;

let message;

if(age>=18){

    message="you can vote Yes";

}

else{

    message="you can't vote No ";

}

 console.log(message);

Output :- 

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Javascript variable with example

 

what is a variable  JavaScript

 1] JavaScript variables are containers for storing information.

2]   JavaScript store data value.

JavaScript Variable 

1] var    

2] let

3] const

1] var   

   1]  JavaScript variables must identified with unique names.

  2]  Unique names call identifier.

 3]  identifier descriptive name is the (total volume,  age, sum).

 4]   Creating a variable  in JavaScript is declaring the variable.

Example :-

JavaScript Code :

    var a= 10;

    var b=20;

    var c= a+b;

    document.write(c);

Output :

2] let :-

 1] let statement separate the variables by comma.

2]  let can not be redeclared.

 

Example :-

JavaScript Code :

{

    let value = 50;

document.write("Inside the function

value = " + value);  

}

document.write("<br> Outside the function value = " + value);  

Output

3] const :-

  1] JavaScript  const is keyword use declare a variable .
  2]  const variable cannot be reassigned a new value.
  3]  const keyword declare a variable do not change the value.
  4] const variable creates only reference value.

Example :-

JavaScript Code :

const x = 90;  

     document.write("const variable value x = " + x);  

OutPut :-

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JavaScript console.log()

What is the console.log() Method

1] console.log() is a built-in function.

2] console.log() is allows to output Message .

3]  And value to the console.

4] console.log() use for debugging & understanding  code.

5] log() method writes a message to the console.

6] log() method useful to testing purposes.

7] console.log() method  is javaScript logs message or data to console.

8] console.log()  debugging by displaying object properties, program flow or variable value .

9] console.log() method supported all browsers. 

Example :- chrome, internet explore,  Edge , Firefox , Safari, Opera, ext.

Console.log(); 

    Syntax 

         console.log(" ");

 

Example :-

 JavaScript code -

console.log

(" Welcome learn programming language to

link-https://webdesigningtheory.blogspot.com/");

Output :-

         

             Data Type  :-  

1] String  data type 

   Example :-

 JavaScript code -

let str =

"Welcome to learn programming language

link-https://webdesigningtheory.blogspot.com/";

console.log(str);

Output :-

2] number  data type 

   Example :-

 JavaScript code -

let A =7;

console.log( A);

Output :-

  3] Boolean  data type 

             1]  Boolean datatype returns either two value - true or false .

             2]   boolean  used  object, condition, variable, expressions etc. 

             3]   boolean terms of True or False value.

   

 Example :-

  JavaScript code -

function one(){

    console.log(Boolean(20));

}

one();

Output

 Example :-

  JavaScript code -

function one(){

    console.log(Boolean(""));

}

one();

Output :-

4] undefined  data type 

     1] undefined value  is global read only variable .

      2] undefined is type of primitive type.

   Example :-

 JavaScript code -

let myvalue;

if (typeof myvalue==="undefined"){

    console.log("myvalue is undefined");

}

else {

    console.log("myvalue is defined");

 

}

Output 

5] null  data type 

          

   Example :-

 JavaScript code -

const value =null;

if(value)

    {

    console.log("value is  not null");

}

else {

    console.log("value is  null ");

}

Output:-

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