Switch Statement in JavaScript

The switch statement performs different actions based on different condition.

It can be called as the replacement of multiple nested if-else statements.

The JavaScript Switch Statement

• The switch statement is used to select one of many code blocks to be executed.
• Switch case is useful for menu based application.

Syntax

switch(expression/variable) {
  case a:
   	 // code block
    break;
  case b:
    	// code block
    break;
  default:
   	 // code block
}

How Switch Statement works?

• At first, the switch expression is evaluated once.
• The value of the expression is compared with each of the case.
• If there is a match, the associated block of code is executed i.e., only one case will be executed.
• If break is not written after each of the code blocks, all the cases are executed after execution of the matched case.
• The default portion is executed only when the user inputs a wrong value(other than the case values).

The getDay() method returns the weekday as a number within the range 0-6.
(Sunday=0, Monday=1, Tuesday=2, Wednesday=3, Thursday=4, Friday=5, Saturday=6)

Example