Boolean Example – Data Type – JavaScript Syntax – JS Boolean Example

Posted by on Sunday, December 27, 2009 · Leave a Comment 

Boolean Example – Data Type – JavaScript Syntax – JS Boolean Example

Purpose: – Illustrates the for the example.
Prerequistes:

Syntax: var myBool = new Boolean(); – Demonstrates creating a Boolean object and various ways to make it true or false

Restrictions: None

Notes:

  • You can build your own library of syntax examples by using same web site over and over and just add new files to it.

Instructions:

  1. Use Visual Web Developer 2008
  2. Create new web site;
    • Click File/New Web Site
    • Select ASP.NET Website Template
    • Select C-Sharp for Language
    • name of Web Site could be JavaScript_Syntax.
  3. Add New folder named “DataType”
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: DataType
  4. Add HTML Page Named Boolean to DataType folder
    • Right-click DataType folder;
    • add new item;
    • Select HTML Page
    • HTML Page could be Boolean
  5. Click on copy code in code below to copy code into HTML Page Boolean.htm
  6. Right-click on HTML page Boolean and select view in browser

    7. View Example In Browser

    < !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html>
  <head>
    <title>Boolean</title>
    <script type="text/javascript" >
        //*****************************************************
        // How to create a Boolean object
        //*****************************************************
 
        var myBool = new Boolean();
 
        //*****************************************************
        // Various Ways to set Boolean object to false
        //*****************************************************
 
        //  Note: If the Boolean object has no initial value or
        // if it is 0, -0, null, "", false, undefined, or NaN, 
        // the object is set to false. Otherwise it is true 
        // (even with the string "false")!
        //*****************************************************
 
        var myBool = new Boolean(0);
        var myBool = new Boolean();
        var myBool = new Boolean("");
        var myBool = new Boolean(null);
        var myBool = new Boolean(NaN);
        var myBool = new Boolean(false);
 
        //*****************************************************
        // Various Ways to set Boolean object to true
        //*****************************************************
 
        var myBool = new Boolean(true);
        var myBool = new Boolean("true");
        var myBool = new Boolean("false");
        var myBool = new Boolean("Mazda");
 
        //*****************************************************
        // How to access a Boolean object
        //*****************************************************
 
        document.write(myBool)
 
 
 
    </script>
  </head>
  <body>
  </body>
</html>

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