Your first script – E-learning

Module 1 — Discovering JavaScript

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What JavaScript does in a web page

Where to write your code, and the console

Your first script

Quiz — Module 1

Module 2 — Language fundamentals

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Variables: let, const and data types

Operators and conditions

Quiz — Module 2

Module 3 — Functions and interactivity

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Manipulating the DOM and changing the page

Quiz — Module 3

Module 4 — Going further

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Arrays and objects

An introduction to APIs with fetch

Quiz — Module 4

JavaScript for beginners

Time to practise! Let’s write your very first JavaScript program together.

Displaying a message

Open the console (F12) and type:

console.log("Bonjour le monde !");

Press Enter: the message appears. Congratulations, you have just run some JavaScript!

A few ground rules

Every statement ends with a semicolon ;.
Text goes between quotation marks (single or double).
JavaScript is case-sensitive: Console and console are two different things.

Now try alert("Hi!");: a small window pops up on the page. You are already seeing interactivity at work.

Key takeaway: a script is a sequence of statements. Start small, test often in the console, and build up step by step.

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