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Hello, JavaScript!
The programs in JavaScript are called scripts. They can be embedded right into HTML using <script> tag and run automatically as the page loads.
For example, this HTML-page shows the "Hello" message:
<!doctype html>
<script>
alert("Hello!");
</script>
JavaScript can execute not only in a browser, but also on a server, or actually on any device that has a special program called the JavaScript engine.
Browsers have built-in JavaScript engines, so they can run scripts.
We can also run scripts using Node.js, it's commonly used to build server-side applications.
Depending on the environment, JavaScript may provide platform-specific functionality.
- In a web browser, JavaScript can manipulate the web-page, send network requests, show messages and so on.
- Node.js allows to run a web-server.
...And so on. Even a coffee machine may include its own JavaScript engine, that could allow us to program its recipes.
In this tutorial we concentrate on the "core JavaScript", that's the same everywhere.**
After you learn it, you can go in any direction: learn browser functionality, how to write servers and so on.
Please turn the page to start learning JavaScript!