js_obj_array.asp

W3Schools tutorial..web designing

<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]=&quot;Saab&quot;;
mycars[1]=&quot;Volvo&quot;;
mycars[2]=&quot;BMW&quot;;</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]=&quot;Saab&quot;;
mycars[1]=&quot;Volvo&quot;;
mycars[2]=&quot;BMW&quot;;</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(&quot;Saab&quot;,&quot;Volvo&quot;,&quot;BMW&quot;);</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]=&quot;Opel&quot;;</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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