Switch Case Command in JavaScript

This guide covers switch case command in JavaScript with practical context and easy-to-follow details. Use it to understand the subject and apply the information confidently.

Starting with JavaScript 1. 2, you can use a Switch Command to correctly handle this situation, and it's actually more efficient than repeating If. Else if statements .

Implementation diagram

The following diagram explains the switch-case command to work:

Syntax

 switch ( expression ) { case condition 1 : statement ( s ) break ; case condition 2 : statement ( s ) break ; . case condition n : statement ( s ) break ; default : statement ( s ) } 

Break Command instructs the end of each specific case. If they are omitted, the interpreter will continue to execute each instruction in each of the following cases.

We will discuss the break command in the Loop control Chapter.

For example

Try the following example to execute the switch-case command

 type = "text/javascript" > 

 Set the variable to different value and then try. 

Result:

 Entering block switch 
 Good job 
 Block Exiting switch 
 Đặt biến vào giá trị khác nhau và thử thử . 

Break commands play an important role in switch-case commands. Try the following code using the switch-case command without any break commands.

 type = "text/javascript" > 

 Set the variable to different value and then try. 

Result:

 Entering block switch 
 Good job 
 Pretty good 
 Passed 
 Not so good 
 Failed 
 Unknown grade 
 Block Exiting switch 
 Đặt biến vào giá trị khác nhau và thử thử . 

According to Tutorialspoint

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Next: The while loop in JavaScript