Switch Case Statement in JavaScript

In this Article, you will learn how to use switch case statement in JavaScript. The switch statement is used to perform different actions based on different conditions.

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Switch Case statement gives a more efficient way to compare a value with multiple variable or expression. It’s better to use switch case than multiple if...else statements.

Syntax

switch(x){
    case value1: // if x === value1
    	...
        break;
    case value2: // if x === value2
        ...
        break;
    default: // if x not match
        ...
}

Switch case statement checks each case from beginning to end until it finds a match, if finds then execute the corresponding block otherwise default code is executed.

Example

Let’s take an example where we want to return a day of week using `getDay()` method. This method returns a number between 0 to 6 based on date. If it’s Sunday then it returns 0, Monday then 1, and so on.

Assume that today is Monday so `getDay()` method returns 1 and based on it `case 1` will be executed.

var day = new Date();
switch(day.getDay())
   {
    case 0:
        console.log("Today is Sunday");
        break;
    case 1:
        console.log("Today is Monday");
        break;

    case 2:
        console.log("Today is Tuesday");
        break;

    case 3:
        console.log("Today is Wednesday");
        break;

    case 4:
        console.log("Today is Thursday");
        break;

    case 5:
        console.log("Today is Friday");
        break;

    case 6:
        console.log("Today is Saturday");
        break;

    default:
        console.log("No Information Found");
        break;
	}

// Output : Today is Monday

Example of switch case for a group

Now we will explain to you how to use grouped cases in switch...case. If we want the same code to run for case 2, case 3 and case 4:

var a=3;
switch(a)
{
    case 1:
        console.log("Value of a is 1");
        break;

    case 2: // grouped three cases
    case 3:
    case 4:
        console.log("Value of between 2 and 4");
        break;

    default:
        console.log("Value of a not matched");
        break;
}

// Output: Value of between 2 and 4

That’s it for today.

Thank you for reading. Happy Coding!