Progress Monitor for IdealProgrammer.com

Take Swift, Intelligent, Massive, Planned, Loving, Effective (S.I.M.P.L.E.) Action to Transform Self into Ideal

Skip Repetitive Navigational Links
Home
News
Presenters
Contact
Please login

Number Example

Description: Illustrates the JavaScript syntax for the Number Object .
Syntax: var num=new Number(123.5); num.property or num.method(); – Demonstrates how to use properties and methods of Number object.
Number Example 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>