JavaScript Essentials: Data Types

In this tutorial, you'll learn about the three main JavaScript data types that are used when writing any JavaScript code.

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Some programming languages have lots of different types of data that they can work with and you have to specify when declaring a variable which type of data you are going to store. Luckily, with JavaScript, we don't need to worry about this too much but it is good to be aware of the different types of data you can work with.

In the lesson, you'll learn about JavaScript strings and numbers. It's important to know the difference as there are somethings you can do with JavaScript strings that you can't do with numbers.

I'll also show you how to identify what type of data is stored in a variable by using the JavaScript typeof operator and how to identify undefined data.

Finally, we'll talk a little about JavaScript objects but we'll be covering this in-depth in a later lesson. Channel Handle @codebubb

[joshuajohnson]

Can you please do a short video on how to use this code to create a contact list? I am trying to learn for free in cisco in this section. I have went through the first lessons, but at the bottom it has an exercise that says something like try to create a contact list using what I have learned in this lesson. I'm still confused. It is at the end of Module 1.