js_comparisons.asp

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<td valign="top">x&gt;=8 is false</td>
</tr>

<tr>
<td valign="top">&lt;=</td>
<td valign="top">is less than or equal to
</td>
<td valign="top">x&lt;=8 is true</td>
</tr>

</table>
<br />
<hr />

<h2>How Can it be Used</h2>
<p>Comparison operators can be used in conditional statements to compare values 
and take action depending on the result:</p>
<table class="ex" cellspacing="0" border="1" width="100%" id="table7">
  <tbody>
    <tr>
      <td>
        <pre>if (age&lt;18) document.write(&quot;Too young&quot;);</pre>
      </td>
    </tr>
  </tbody>
</table>
<p>You will learn more about the use of 
conditional statements in the next chapter of this tutorial.</p>
<hr />

<h2>Logical Operators</h2>
<p>Logical operators are used in determine the logic between variables or 
values.</p>
<p>Given that <b>x=6 and y=3</b>, the table below explains the logical 
operators: </p>

<table class="ex" cellspacing="0" border="1" width="100%" id="table2">

<tr>
<th width="15%" align="left">Operator</th>
<th width="45%" align="left">Description</th>
<th width="40%" align="left">Example</th>
</tr>

<tr>
<td valign="top">&amp;&amp;</td>
<td valign="top">and
</td>
<td valign="top"> (x &lt; 10 &amp;&amp; y &gt; 1) is true</td>
</tr>

<tr>
<td valign="top">
||</td>
<td valign="top">or
</td>
<td valign="top"> (x==5 || y==5) is false</td>
</tr>

<tr>
<td valign="top">
!</td>
<td valign="top">not
</td>
<td valign="top"> !(x==y) is true</td>
</tr>

</table>
<br />
<hr />

<h2>Conditional Operator</h2>
<p>JavaScript also contains a conditional operator that assigns a value to a variable based on some condition.</p>
<h3>Syntax</h3>
<table class="ex" cellspacing="0" border="1" width="100%" id="table5">
  <tbody>
    <tr>
      <td>
        <pre>variablename=(condition)?value1:value2&nbsp;</pre>
      </td>
    </tr>
  </tbody>
</table>
<h3>Example</h3>
<table class="ex" cellspacing="0" border="1" width="100%" id="table6">
  <tbody>
    <tr>
      <td>
        <pre>greeting=(visitor==&quot;PRES&quot;)?&quot;Dear President &quot;:&quot;Dear &quot;;</pre>
      </td>
    </tr>
  </tbody>
</table>
<p>If the variable <b>visitor</b> has the value of &quot;PRES&quot;, then the variable <b>
greeting</b> will be assigned the value &quot;Dear
President &quot; else it will be assigned &quot;Dear&quot;.</p>


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