Number Example – Data Type – JavaScript Syntax – JS Number Example
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String Example – Data Type – JavaScript Syntax – JS String Example
Purpose: – Illustrates the JavaScript syntax for the Number Object .
Prerequistes:
- Install Visual Web Developer 2008
Syntax: var num=new Number(123.5); num.property or num.method(); – Demonstrates how to use properties and methods of Number object.
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 should be: DataType
- Add HTML Page Named Number to DataType folder
- Right-click DataType folder;
- add new item;
- Select HTML Page
- HTML Page name should be Number
- Click on copy code in code below to copy code into HTML Page Number.htm
- Right-click on HTML page Number 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" > |
//***************************************************** |
// Number Object |
//***************************************************** |
// NOTE: Number Objects are created by "new Number(value) |
//***************************************************** |
// GENERAL SYNTAX: |
// Properties: |
// var num=new Number(123.5); num.property; |
// Method: |
// var num=new Number(123.5); num.method; |
//***************************************************** |
// *** Number Object Properties *** |
//***************************************************** |
document.write("***NUMBER PROPERTIES***"); |
document.write("<br />"); |
// Property Description |
// constructor Returns the function that created the Number object's prototype |
var num=new Number(123.5); |
document.write("num.constructor: " + num.constructor); // output: function Number() { [native code] } |
document.write("<br />"); |
// MAX_VALUE Returns the largest number possible in JavaScript |
document.write("Number.MAX_VALUE: " + Number.MAX_VALUE); // output: 1.7976931348623157e+308 |
document.write("<br />"); |
// MIN_VALUE Returns the smallest number possible in JavaScript |
document.write("Number.MIN_VALUE: " + Number.MIN_VALUE); // output: 5e-324 |
document.write("<br />"); |
// NEGATIVE_INFINITY Represents negative infinity (returned on overflow) |
document.write("Number.NEGATIVE_INFINITY: " + Number.NEGATIVE_INFINITY); // output: -Infinity |
document.write("<br />"); |
// POSITIVE_INFINITY Represents infinity (returned on overflow) |
document.write("Number.POSITIVE_INFINITY: " + Number.POSITIVE_INFINITY); // output: Infinity |
document.write("<br />"); |
// prototype Allows you to add properties and methods to an object |
function car(make, model, year) { |
this.make = make; |
this.model = model; |
this.year = year; |
} |
var myCar = new car("Toyota", "Corolla", 2002); |
car.prototype.cost = null; |
myCar.cost = 20000; |
document.write("myCar.cost: " + myCar.cost); |
document.write("<br />"); |
//***************************************************** |
// *** Number Object Methods *** |
//***************************************************** |
document.write("***NUMBER METHODS***"); |
document.write("<br />"); |
// Method Description |
// toExponential(x) Converts a number into an exponential notation - x is |
// optional parameter that indicates precision |
var numy = new Number(17.12344); |
document.write("numy.toExponential(): " + numy.toExponential() + "<br />"); |
document.write("numy.toExponential(2): " + numy.toExponential(2) + "<br />"); |
document.write("numy.toExponential(4): " + numy.toExponential(4) + "<br />"); |
document.write("numy.toExponential(6): " + numy.toExponential(6)); |
// toFixed(x) Formats a number with x numbers of digits after the decimal point |
var numx = new Number(17.12344); |
document.write("numx.toFixed(2): " + numx.toFixed(2) + "<br />"); |
// toPrecision(x) Formats a number to x length |
var numz = new Number(17.12344); |
document.write("numz.toPrecision(2): " + numz.toPrecision(2) + "<br />"); |
// toString() Converts a Number object to a string |
var numa = new Number(17.12344); |
document.write("numa.toString(): " + numa.toString() + "<br />"); |
// valueOf() Returns the primitive value of a Number object |
var numb = new Number(17.12344); |
document.write("numb.valueOf(): " + numb.valueOf() + "<br />"); |
</script> |
</head> |
<body> |
</body> |
</html> |
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