Hi Guys!

Today we’ll be talking about an alternative to the traditional if-else statements, and it’s called switch case! If you haven’t seen Day 3, please click on the link below!

Javascript in 15 Days : Conditionals

So, let’s jump straight in, shall we?

Examples

Here’s an example of using switch-case to toggle a light switch:

var toggle = 0;
switch (toggle) {
    case 0:
        console.log('Light has been turned off!'); // this is most likely to show
        break;
    case 1:
        console.log('Light has just been turned on');
        break;
    default:
        console.log('Please re-check your value');
}

So, we can see that we first initialize the value of a variable, (here’s it’s “toggle”) and we use a switch-case to check whether it has a value of 0, 1 or something else, and we log the output based on this. The following example can also be written in if-else statements as below:

var toggle = 0;
if (toggle === 0) {
    console.log('Light has been turned off!'); // this is more likely to show
} else if (toggle === 1) {
    console.log('Light has just been turned on!');
} else {
    console.log('Please re-check your value!');
}

Summary

As you can see, it’s so much simpler with switch case! So, you might be wondering, when to use a switch-case? Well, a couple of examples would be when you’re checking what day of the week it is, or a simple true or false statement, or even when intending to do different things based on the month of the year! As you can see, switch-case is definitely useful! So, here’s the end of today’s session! Hope you enjoyed and learned new things today! We will be having a review day tomorrow! See you soon!

Javascript in 15 Days : Review Day