In this tutorial, we are going to learn about If, Else, Else If Statement using JavaScript. These all statement execute with a condition. With the use If, Else, and Else If, you can make your program knowledgeable.

If Statement - JavaScript

This is If Statement. It will execute if the condition is True.

1. <
   
   script>
   
2. var
   
   age =
   
   16
   
   ;
   
3. 
   
4. if
   
   (
   
   age <
   
   18
   
   )
   
   {
   
5. {
   
6. alert (
   
   " You are a minor."
   
   )
   
   ;
   
7. }
   
8. }
   
9. </
   
   script>
   

This is the Output:

If... Else Statement - JavaScript

The example above will execute only if the condition is true. If.. Else statement it will execute another statement if the condition is false.

1. <
   
   script>
   
2. var
   
   age =
   
   0
   
   ;
   
3. if
   
   (
   
   age <
   
   18
   
   )
   
   {
   
4. if
   
   (
   
   age >
   
   0
   
   )
   
5. {
   
6. alert (
   
   " You are a minor."
   
   )
   
   ;
   
7. }
   
   else
   
   {
   
8. alert (
   
   "Input Correct Details. Try Again."
   
   )
   
   ;
   
9. }
   
10. }
    
11. </
    
    script>
    

This is the Output:

If... Else If... Else Statement - JavaScript

You can use this statement if you want multiple conditions.

1. <
   
   script>
   
2. var
   
   age =
   
   19
   
   ;
   
3. if
   
   (
   
   age <
   
   18
   
   )
   
   {
   
4. if
   
   (
   
   age >
   
   0
   
   )
   
5. {
   
6. alert (
   
   " You are a minor."
   
   )
   
   ;
   
7. }
   
   else
   
   {
   
8. alert (
   
   "Input Correct Details. Try Again."
   
   )
   
   ;
   
9. }
   
10. }
    
    else
    
    if
    
    (
    
    age >=
    
    18
    
    )
    
11. {
    
12. alert (
    
    "You are already an Adult."
    
    )
    
13. }
    
14. </
    
    script>
    

This is the Output:


Hope that this simple tutorial that I created may help you to your future projects. Also, for the beginners who want to learn basic of coding in JavaScript.

Related Code: PHP If…Else Statements

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