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‎1-js/01-getting-started/01-hello-javascript/article.md‎

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# Hello, JavaScript!
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JavaScript has a rich history.
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It was created in 1995 as a simple language exclusively for web browsers, to “make web pages alive”. Since then it has greatly evolved.
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JavaScript was created in 1995 as a simple language exclusively for web browsers, to "make web pages alive". Since then it has greatly evolved, it's quite far from there it started.
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Today we can use JavaScript on many platforms:
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- In a web-browser, by embedding it into a web page.
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- On a general purpose computer or a server, using [Node.js](https://nodejs.org) and other means.
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- ...Or actually on any device that has a special piece of software, called "JavaScript engine".
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- ...Or actually on any device that has a special piece of software, called "a JavaScript engine".
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Technically, even a coffee machine can include its own JavaScript engine to allow programming of coffee recipes.
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![](javascript-engine.svg)
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There's a formal language description called [ECMAScript Language Specification](https://tc39.es/ecma262/), it describes how a JavaScript engine works. Sometimes we'll give references to it, but, though technically strict, it's hard to read for humans. At least at first.
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Programs in JavaScript are called *scripts*.
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Browsers have built-in JavaScript engines, so they can run scripts. They can be embedded right into HTML using the `<script>` tag and run automatically as the page loads.
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For example, this HTML-page shows the "Hello, world!" message:
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```html run height=0
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<!doctype html>
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<script>
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alert("Hello, world!");
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</script>
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```
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To see it in action, you can click the "run" button in the upper-right corner. Also you can create a new file, e.g. `my.html` with this text and open it locally in a browser.
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Depending on the environment, JavaScript may provide platform-specific functionality.
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There's a formal language description called [ECMAScript Language Specification](https://tc39.es/ecma262/), it describes how a JavaScript engine works. Sometimes we'll give references to it, but, though technically correct, it's hard to read for humans.
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- In a browser, JavaScript can manipulate the web-page, send network requests, show messages and so on.
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- In node.js we can use JavaScript to run a web-server, read and write arbitrary files.
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- ...And so on.
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Programs in JavaScript are called "scripts".
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**In this course we concentrate on the core JavaScript, that's the same everywhere.**
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**In this tutorial we concentrate on the "core" JavaScript, that works mostly everywhere.**
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We'll try to keep browser-specific notes at minimum. After you learn the core, you can go in any direction: browsers, frameworks, servers and so on.
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Then, after you're familiar with it, you'll be able to move in any direction: browsers, servers and so on.
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Turn the page to start learning JavaScript!

‎1-js/01-getting-started/02-basics/article.md‎

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‎1-js/01-getting-started/02-basics/use-strict.svg‎

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‎1-js/01-getting-started/02-statements/01-console-log/solution.js‎

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console.log("It works");

‎1-js/01-getting-started/02-statements/01-console-log/solution.md‎

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Congratulations!
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This task was simple though.
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Go ahead to learn more.

‎1-js/01-getting-started/02-statements/01-console-log/source.js‎

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‎1-js/01-getting-started/02-statements/01-console-log/task.md‎

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# Hello, world!
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Welcome to the tasks!
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Practicing will help you to understand theory and hone your skills!
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The first task is simple, just to get acquainted.
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Write the code to `console.log` a message "Hello" (you actually saw the correct right in the tutorial).
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‎1-js/01-getting-started/02-statements/01-console-log/test.js‎

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// TODO: tests are executed after code (See evalWorker.js)
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//
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window.addEventListener('message', event => {
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// event.name = message or log or whatever?
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// check that console.log happened
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console.error(event);
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});

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