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<p>From <b>http://www.w3schools.com</b> (Copyright Refsnes Data)</p>
<h1>JavaScript Array Object</h1>
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<p class="intro">The Array object is used to store a set of values in a single variable name.</p>
<hr />
<h2>Examples</h2>
<p>
<a target="_blank" href="tryit.asp@filename=tryjs_array">Create an array</a><br />
Create an array, assign values to it, and write the values to the output.</p>
<p><a target="_blank" href="tryit.asp@filename=tryjs_array_for_in">For...In
Statement</a><br />
How to use a for...in statement to loop through the elements of an array.</p>
<p>
<a target="_blank" href="../jsref/tryit.asp@filename=tryjsref_concat">Join two
arrays - concat()</a><br />
How to use the concat() method to join two arrays.
</p>
<p>
<a target="_blank" href="../jsref/tryit.asp@filename=tryjsref_join">Put array
elements into a string - join()</a><br />
How to use the join() method to put all the elements of an array into a string.</p>
<p>
<a target="_blank" href="../jsref/tryit.asp@filename=tryjsref_sort">Literal array
- sort()</a><br />
How to use the sort() method to sort a literal array.</p>
<p>
<a target="_blank" href="../jsref/tryit.asp@filename=tryjsref_sort2">Numeric array
- sort()</a><br />
How to use the sort() method to sort a numeric array.</p>
<hr />
<h2>Complete Array Object Reference</h2>
<p>For a complete reference of all the properties and methods that can be used with
the Array object, go to our <a href="../jsref/jsref_obj_array.asp">
complete Array object reference</a>.</p>
<p>The reference contains a brief description and examples of use for each
property and method!</p>
<hr />
<h2>Defining Arrays</h2>
<p>The Array object is used to store a set of values in a single variable name.</p>
<p>We define an Array object with the new keyword. The following code line
defines an Array object called myArray:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table5">
<tr>
<td>
<pre>var myArray=new Array()</pre>
</td>
</tr>
</table>
<p>There are two ways of adding values to an array (you can add as many values
as you need to define as many variables you require).</p>
<p>1:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table1">
<tr>
<td>
<pre>var mycars=new Array();
mycars[0]="Saab";
mycars[1]="Volvo";
mycars[2]="BMW";</pre>
</td>
</tr>
</table>
<p>You could also pass an integer argument to control the array's size:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table4">
<tr>
<td>
<pre>var mycars=new Array(3);
mycars[0]="Saab";
mycars[1]="Volvo";
mycars[2]="BMW";</pre>
</td>
</tr>
</table>
<p>2:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table2">
<tr>
<td>
<pre>var mycars=new Array("Saab","Volvo","BMW");</pre>
</td>
</tr>
</table>
<p><b>Note:</b> If you specify numbers or true/false
values inside the array then the type of variables will be numeric or Boolean instead
of string.</p>
<hr />
<h2>Accessing Arrays</h2>
<p>You can refer to a particular element in an array by referring to the name of
the array and the index number. The index number starts at 0.</p>
<p>The following code line:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table6">
<tr>
<td>
<pre>document.write(mycars[0]);</pre>
</td>
</tr>
</table>
<p>will result in the following output:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table7">
<tr>
<td>
<pre>Saab</pre>
</td>
</tr>
</table>
<br />
<hr />
<h2>Modify Values in Existing Arrays</h2>
<p>To modify a value in an existing array, just add a new value to the array
with
a specified index number:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table10">
<tr>
<td>
<pre>mycars[0]="Opel";</pre>
</td>
</tr>
</table>
<p>Now, the following code line:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table13">
<tr>
<td>
<pre>document.write(mycars[0]);</pre>
</td>
</tr>
</table>
<p>will result in the following output:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table14">
<tr>
<td>
<pre>Opel</pre>
</td>
</tr>
</table>
<br />
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