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 JavaScript syntax for the Boolean example.
Prerequistes:
- Install Visual Web Developer 2008
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:
- Use Visual Web Developer 2008
- 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.
- Add New folder named "DataType"
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: DataType
- Add HTML Page Named Boolean to DataType folder
- Right-click DataType folder;
- add new item;
- Select HTML Page
- HTML Page could be Boolean
- Click on copy code in code below to copy code into HTML Page Boolean.htm
- Right-click on HTML page Boolean and select view in browser
| HTML | | copy code | | ? |
< !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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