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

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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

     HTML |  copy code |? 
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    < !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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    <html>
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      <head>
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        <title>Boolean</title>
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        <script type="text/javascript" >
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            //*****************************************************
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            // How to create a Boolean object
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            //*****************************************************
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            var myBool = new Boolean();
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            //*****************************************************
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            // Various Ways to set Boolean object to false
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            //*****************************************************
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            //  Note: If the Boolean object has no initial value or
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            // if it is 0, -0, null, "", false, undefined, or NaN, 
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            // the object is set to false. Otherwise it is true 
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            // (even with the string "false")!
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            //*****************************************************
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            var myBool = new Boolean(0);
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            var myBool = new Boolean();
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            var myBool = new Boolean("");
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            var myBool = new Boolean(null);
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            var myBool = new Boolean(NaN);
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            var myBool = new Boolean(false);
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            //*****************************************************
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            // Various Ways to set Boolean object to true
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            //*****************************************************
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            var myBool = new Boolean(true);
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            var myBool = new Boolean("true");
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            var myBool = new Boolean("false");
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            var myBool = new Boolean("Mazda");
    39
     
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            //*****************************************************
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            // How to access a Boolean object
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            //*****************************************************
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            document.write(myBool)
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        </script>
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      </head>
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      <body>
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      </body>
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    </html>
    53
     
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