JavaScript

JS RegExp Object

JavaScript RegExp Object

The Javascript RegExp object consists of properties and methods that are used to find and replace characters that fit in a string.

JavaScript Math Object

Example Match()

<script type="text/javascript">
<!--
var txt = "Los Angels is a magic city";
var a = /angels/i;
document.write(txt.match(a));
//-->
</script>

Result:

Angels

Example Test()

<script type="text/javascript">
<!--
var a=new RegExp("magic");
document.write(a.test("Los Angels is a magic city"));
//-->
</script>

Result:

true

Example Exec()

<script type="text/javascript">
<!--
var a=new RegExp("m");
var b=new RegExp("x");

document.write(a.exec("My Script") + "<br />" + b.exec("My Script"));
//-->
</script>

Result:

null

JS Math Object

JavaScript Math Object

The Javascript Math object is used for performing mathematical calculations using properties and functions like: max, min, round, random, sin, cos, sqrt, log, ceil, abs, e, pi.

JavaScript Math Object

Example Max()

<script type="text/javascript">
<!--
var a = document.getElementById.innerHTML=Math.max(3,7);
document.write(a);
//-->
</script>

Result:

Example Min()

<script type="text/javascript">
<!--
var a = document.getElementById.innerHTML=Math.min(3,7);
document.write(a);
//-->
</script>

Result:

Example Round()

<script type="text/javascript">
<!--
var a = document.getElementById.innerHTML=Math.round(3.7);
document.write(a);
//-->
</script>

Result:

JS String Object

JavaScript String Object

The Javascript String object is a series of characters in a character string. With String object you can manipulate strings.

JavaScript Array Object

Example 1:

<script type="text/javascript">
<!--
var city="New York city!";
 document.write(city.length);
//-->
</script>

Result:

Example 2:

<script type="text/javascript">
<!--
var str="Hello visitor, welcome to www.javascriptutorial.com ";
var n=str.indexOf("visitor");
document.write(n);
//-->
</script>

Result:

JS Array Object

JavaScript Array Object

The Javascript Array object is a one-dimensional array that has several properties and methods.
JavaScript stores lists of values in array.

Create JavaScript Array Object

Example 1:

<script type="text/javascript">
<!--
var cities=new Array(); 
 cities[0]="London";       
 cities[1]="New York";
 cities[2]="Toronto";
 cities[3]="Berlin";
 cities[4]="New Delhi";       
document.write(cities[2]); 
//-->
</script>

Result:

Toronto

Example 2:

<script type="text/javascript">
<!--
var cities=new Array("London", "New York", "Toronto", "Berlin", "New Delhi");        
document.write(cities[0]); 
//-->
</script>

Result:

London

Example 3:

<script type="text/javascript">
<!--
var cities=["London", "New York", "Toronto", "Berlin", "New Delhi"];        
document.write(cities[3]); 
//-->
</script>

Result:

Berlin

JS Objects

JavaScript Objects

An object is a collection of properties and methods withheld under one name.

Properties

Properties or attributes of an object describes the special features and identity.

<script>
var a="Hello people!";
 document.write(a.length);
</script>

Result:

Methods

Methods or functions of an object are actions that can be performed on an object.

<script>
var a="Hello people!";
 document.write(a.bold());
</script>

Result: