Conditional Rendering in React Complete Guide with Examples 2026

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  Conditional Rendering in React Conditional Rendering is one of the most useful concepts in React. It means showing different content on the screen depending on a condition. For example: If a user is logged in → show Logout If a user is not logged in → show Login If a student has passed → show Congratulations If a product is available → show Buy Now If data is loading → show Loading... React does not have a separate if rendering tag. Instead, we use normal JavaScript conditions such as if, the ternary operator, &&, and switch to decide what should appear in the UI.
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Javascript variable with example

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 :

variable javascript

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

let variable javascript


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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