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<nav id="navbar">
		<header>
			<h1>JavaScript Documentation</h1>
		</header>
		<section>
			<a href="#Introduction" class="nav-link">Introduction</a>
			<a href="#JavaScript_and_Java" class="nav-link">JavaScript and Java</a>
			<a href="#Hello_world" class="nav-link">Hello world</a>
			<a href="#Data_types" class="nav-link">Data types</a>
			<a href="#if-else_statement" class="nav-link">if-else statement</a>
			<a href="#Function_declarations" class="nav-link">Function declarations</a>
		</section>
	</nav>
	<main id="main-doc">
		<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:
			</p>
			<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>
		</section>
		<section class="main-section" id="JavaScript_and_Java">
			<header>JavaScript and Java</header>
			<p>
				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.
			</p>
			<p>
				In contrast to Java's compile-time system of classes built by declarations, JavaScript supports a
				runtime system based on a small number of data types representing numeric, Boolean, and string values.
				JavaScript has a prototype-based object model instead of the more common class-based object model. The
				prototype-based model provides dynamic inheritance; that is, what is inherited can vary for individual
				objects. JavaScript also supports functions without any special declarative requirements. Functions can
				be properties of objects, executing as loosely typed methods.
			</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>
				<pre>function greetMe(yourName) { alert("Hello " + yourName); }
greetMe("World");</pre>
			</code>
			<p>
				Select the code in the pad and hit Ctrl+R to watch it unfold in your browser!
			</p>
		</section>
		<section class="main-section" id="Data_types">
			<header>Data types</header>
			<p>The latest ECMAScript standard defines seven data types:</p>
			<ul>
				<li>
					Six data types that are primitives:
					<ul>
						<li>
							Boolean. true and false.
						</li>
						<li>
							null. A special keyword denoting a null value. Because JavaScript is case-sensitive, null is
							not the same as Null, NULL, or any other variant.
						</li>
						<li>
							undefined. A top-level property whose value is undefined.
						</li>
						<li>
							Number. 42 or 3.14159.
						</li>
						<li>
							String. "Howdy"
						</li>
						<li>
							Symbol (new in ECMAScript 2015). A data type whose instances are unique and immutable.
						</li>
					</ul>
				</li>
				<li>and Object</li>
			</ul>
			<p>
				Although these data types are a relatively small amount, they enable you to perform useful functions
				with your applications. Objects and functions are the other fundamental elements in the language. You
				can think of objects as named containers for values, and functions as procedures that your application
				can perform.
			</p>
		</section>
		<section class="main-section" id="if-else_statement">
			<header>if-else statement</header>
			<p>
				Use the if statement to execute a statement if a logical condition is true. Use the optional else clause
				to execute a statement if the condition is false. An if statement looks as follows:
			</p>
			<code>
				<pre>if (condition) { statement_1; } else { statement_2; }</pre>
			</code>
			<p>
				condition can be any expression that evaluates to true or false. See Boolean for an explanation of what
				evaluates to true and false. If condition evaluates to true, statement_1 is executed; otherwise,
				statement_2 is executed. statement_1 and statement_2 can be any statement, including further nested if
				statements.
			</p>
			<p>
				You may also compound the statements using else if to have multiple conditions tested in sequence, as
				follows:
			</p>
			<code>
				<pre>if (condition_1) { statement_1; } else if (condition_2) { statement_2;
} else if (condition_n) { statement_n; } else { statement_last; }</pre>
			</code>
			<p>
				In the case of multiple conditions only the first logical condition which evaluates to true will be
				executed. To execute multiple statements, group them within a block statement ({ ... }) . In general,
				it's good practice to always use block statements, especially when nesting if statements:
			</p>
			<code>
				<pre>if (condition) { statement_1_runs_if_condition_is_true;
statement_2_runs_if_condition_is_true; } else {
statement_3_runs_if_condition_is_false;
statement_4_runs_if_condition_is_false; }</pre>
			</code>
			<p>
				It is advisable to not use simple assignments in a conditional expression, because the assignment can be
				confused with equality when glancing over the code. For example, do not use the following code:
			</p>
			<code>
				<pre>if (x = y) { /* statements here */ }</pre>
			</code>
			<p>
				If you need to use an assignment in a conditional expression, a common practice is to put additional
				parentheses around the assignment. For example:
			</p>
			<code>
				<pre>if ((x = y)) { /* statements here */ }</pre>
			</code>
		</section>
		<section class="main-section" id="Function_declarations">
			<header>Function declarations</header>
			<p>A function definition (also called a function declaration, or function statement) consists of the
				function keyword, followed by:</p>
			<ul>
				<li>The name of the function.</li>
				<li>A list of arguments to the function, enclosed in parentheses and separated by commas.</li>
				<li>The JavaScript statements that define the function, enclosed in curly brackets, { }.</li>
			</ul>
			<p>For example, the following code defines a simple function named square:</p>
			<code>
				<pre>function square(number) { return number * number; }</pre>
			</code>
			<p>
				The function square takes one argument, called number. The function consists of one statement that says
				to return the argument of the function (that is, number) multiplied by itself. The return statement
				specifies the value returned by the function.
			</p>
			<code>
				<pre>return number * number;</pre>
			</code>
			<p>
				Primitive parameters (such as a number) are passed to functions by value; the value is passed to the
				function, but if the function changes the value of the parameter, this change is not reflected globally
				or in the calling function.
			</p>
		</section>
	</main>