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<header>JS Documentation</header>
<a class="nav-link"href="Introduction" id="Introduction">Introduction</a>
<a class="nav-link"href="What_you_should_already_know" id="What_you_should_already_know">What you should already know</a>
<a class="nav-link"href="JavaScript_and_Java" id="JavaScript_and_Java">JavaScript and Java</a>
<a class="nav-link"href="Hello_world" id="Hello_world">Hello world</a>
<a class="nav-link"href="Variables" id="Variables">Variables</a>
<a class="nav-link"href="Declaring_variables" id="Declaring_variables">Declaring variables</a>
<a class="nav-link"href="Variable_scope id="Variable_scope">Variable scope</a>
<a class="nav-link"href="Global_variables" id="Global_variables">Global variables</a>
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<section class="main-section" id="Introduction">
<header>Introduction</header>
<p>
JavaScript is a cross-platform, object-oriented scripting language. It is a small and lightweight language. Inside a host environment (for example, a web browser), JavaScript can be connected to the objects of its environment to provide programmatic control over them</p>
<p>JavaScript contains a standard library of objects, such as Array, Date, and Math, and a core set of language elements such as operators, control structures, and statements. Core JavaScript can be extended for a variety of purposes by supplementing it with additional objects; for example:
<ul>
<li>Client-side JavaScript extends the core language by supplying objects to control a browser and its Document Object Model (DOM). For example, client-side extensions allow an application to place elements on an HTML form and respond to user events such as mouse clicks, form input, and page navigation.</li>
<li>Server-side JavaScript extends the core language by supplying objects relevant to running JavaScript on a server. For example, server-side extensions allow an application to communicate with a database, provide continuity of information from one invocation to another of the application, or perform file manipulations on a server.</li>
</ul></p>
</section>
<section class="main-section" id="What_you_should_already_know">
<header>What you should already know </header>
<p>This guide assumes you have the following basic background:</p>
<ul>
<li>A general understanding of the Internet and the World Wide Web (WWW).</li>
</ul></section>
<section class="main-section" id="JavaScript_and_Java">
<header>JavaScript and Java</header>
<p>JavaScript and Java are similar in some ways but fundamentally different in some others. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. JavaScript follows most Java expression syntax, naming conventions and basic control-flow constructs which was the reason why it was renamed from LiveScript to JavaScript.</p>
<p>JavaScript is a very free-form language compared to Java. You do not have to declare all variables, classes, and methods. You do not have to be concerned with whether methods are public, private, or protected, and you do not have to implement interfaces. Variables, parameters, and function return types are not explicitly typed.</p></section>
<section class="main-section" id="Hello_world">
<header>Hello world</header>
<p>To get started with writing JavaScript, open the Scratchpad and write your first "Hello world" JavaScript code:</p><code>function greetMe(yourName) { alert("Hello " + yourName); }
greetMe("World");</code>
</section>
<section class="main-section" id="Variables">
<header>Variables</header>
<p>You use variables as symbolic names for values in your application. The names of variables, called identifiers, conform to certain rules.</p><p>A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase).</p><code></code><ul>
<li></li>
</ul>
</section>
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<section class="main-section" id="Declaring_variables">
<header>Declaring variables </header>
<p>You can declare a variable in three ways:
With the keyword var. For example,</p><code>var x = 42.</code>
<p>This syntax can be used to declare both local and global variables.
By simply assigning it a value. For example,</p>
<code>x = 42.</code><ul>
<li></li>
</ul>
<p>This always declares a global variable. It generates a strict JavaScript warning. You shouldn't use this variant.
With the keyword let. For example,</p>
<ul>
<li></li>
</ul>
</section>
<section class="main-section" id="Variable_scope"><header>Variable scope</header>
<p>When you declare a variable outside of any function, it is called a global variable, because it is available to any other code in the current document. When you declare a variable within a function, it is called a local variable, because it is available only within that function.</p>
<code>if (true) { var x = 5; } console.log(x); // 5</code><ul>
<li></li>
</ul>
</section>
<section class="main-section" id="Global_variables">
<header><h1>Global variables</header>
<p>Global variables are in fact properties of the global object. In web pages the global object is window, so you can set and access global variables using the window.variable syntax.</p><code></code>
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<li></li>
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