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by Jeremy Thomas

Since you've already learned Web design in 4 minutes , it's time to dive into the Web's main programming language: JavaScript .

It looks like you're on a mobile device tablet ! 😱

But fear not! 😊

While this tutorial is not optimized for this platform, I still made it readable enough for you to enjoy.

You should however revisit it on a desktop later if you can, to experience all the features!

Anyway, let's get started !

I believe you are using this:

Operating System
Web Browser

If this information is correct, let's get started .

It looks that you've already been here! 😃 Do you want to resume from where you left off or start over ?

Console tool

Your browser comes with a developer console that allows you to type JavaScript directly in this webpage.

developer console
Since you're using Google Chrome , open the JavaScript console with or
Since you're using Mozilla Firefox , open the Web console with or
Since you're using Microsoft Edge , open the JavaScript console with
Since you're using Opera , open the JavaScript console with

Since you're using Apple Safari :

Preferences Advanced Show Develop menu in menu bar

Let's see if it works!

In the console, type (or paste) the following, and press Enter

Run snippet

Great job!

You've just used , a native JavaScript function that comes with every browser.

But what have you done exactly ?

You've called the alert() function with the 'HelloWorld!' parameter .

called

You have basically done 4 things:

you typed the name of the function
you opened a parenthesis
you typed a parameter
you closed the parenthesis

Sometimes, there's no parameter. Sometimes, there's multiple parameters. Most of them are required, but some of them can be optional.

In this case, alert() requires only one parameter.

But what type of parameter is that?

Strings type

When you handle text, you're using strings , which are a series of . In our case, we used a series of 12 characters : . This includes all lowercase and uppercase letters, the space, and the exclamation point.

To define where the string and where it , you need to wrap it in quotes (either single or double ).

When you defined the string:

What if you wanted to deal with numbers instead ?

Numbers type

Like any other programming language, JavaScript can handle numbers .

These numbers can be big or small, with or without decimals, combined through numeric operations…

Type or paste the following snippet in your console:

Run snippet

Perfect!

Notice a few things:

You can find numbers in lots of places .

operators
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