1. The Number object

The Number object is another predefined JavaScript object that offers some useful properties and methods for use with numbers.

Properties of the Number object

- Example:
In the following JS script we create a new property (mult8) to the Number object, this new property multiplies by 8 the value of a variable.
<script type="text/javascript"><!--
var nr = 7;

// creates a new property ( mult8 ) to the Number object
Number.prototype.mul8 = nr*8;

// uses the property "mult8"
document.write(nr.mul8);       // 65

Methods of the Number Object

2. The Math object

The Math object is a predefined JavaScript object used for mathematical purposes, it provides constants and functions for more complex operations.
If for example we want to get a random number between 0 and 1, we write:

Properties of the Math object

All of the properties of the Math object contain read-only values, that can be useful in mathematical calculations (They must be written with capital letters). - Example:
<script type="text/javascript"><!--
// find the area of a circle,
var rad = 7.8;           // radius value
var area = Math.PI * (rad * rad);     // gets the area
document.write(area);        // 191.134497044403

Methods of the Math Object

The methods of the Math object enable you to perform certain calculations in your scripts.
- Some examples:
1) Alerts the value of the positive square root of 64, which is 8.
<script type="text/javascript"><!--
alert(Math.sqrt(64));         // 8

2) Returns the number with the highest value, between 8, 4, 88, 56
<script type="text/javascript"><!--
alert(Math.max(8, 4, 88, 56));       // 88

3) The following code would return the value of 4 to the 3rd power
<script type="text/javascript"><!--
alert(Math.pow(4, 3));       // 64

- Math.random() only returns numbers between zero and one. If you want to generate a random integer between two integers, you can combine the methods "round()" and "random()", as shown in the following example.
<script type="text/javascript"><!--
// gets an random integer between 1 and 10
var lower = 1;
var higher = 10;
var nr = Math.round(Math.random() * (higher - lower)) + lower;

The Number and Math Objects

Daily Test with Code Example

Which tag can be used to create input text field in web page?
<form> <input> <div>
<input type="text" name="a_name" value="val" />
Which CSS property displays the text in a small-caps font?
display font-variant font-style
h3 {
  font-variant: small-caps;
What instruction displays a notice box with a message inside it, in JavaScript?
for() Date() alert()
var msg = "Visit CoursesWeb.net";
Indicate the PHP code used to get the users IP.
echo $ip;

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