For a complete reference of all the properties and methods that can be used with the Date object, go to our complete Date object reference.

**BUILT â€“IN
OBJECTS**

**Java Script String**

The
String object is used to manipulate a stored piece of text.

**Complete String Object Reference**

For a complete reference of all the properties and
methods that can be used with the String object, go to our complete String
object reference.

The
reference contains a brief description and examples of use for each property
and method!

**String object**

The
String object is used to manipulate a stored piece of text.

**Examples of use:**

The following example uses the length property of
the String object to find the length of a string: var txt="Hello
world!";

document.write(txt.length);

The code
above will result in the following output:

12

**JavaScript Date Object**

The Date
object is used to work with dates and times.

**Complete Date Object Reference**

For a complete reference of all the properties and
methods that can be used with the Date object, go to our complete Date object
reference.The reference contains a brief description and examples of use for
each property and method!

**Create a Date Object**

The Date
object is used to work with dates and times. Date objects are created with the
Date() constructor.

**Set Dates**

We can easily
manipulate the date by using the methods available for the Date object.

**Complete Boolean Object Reference**

For a complete reference of all the properties and
methods that can be used with the Boolean object, go to our complete Boolean
object reference.The reference contains a brief description and examples of use
for each property and method!

**Create a Boolean Object**

The Boolean object represents two values:
"true" or "false".The following code creates a Boolean
object called myBoolean:

var
myBoolean=new Boolean();

**JavaScript Math Object**

The Math
object allows you to perform mathematical tasks.

**Complete Math Object Reference**

For a complete reference of all the properties and
methods that can be used with the Math object, go to our complete Math object
reference.The reference contains a brief description and examples of use for
each property and method!

**Math Object**

The Math object allows you to perform mathematical
tasks.The Math object includes several mathematical constants and methods.

**Syntax for using properties/methods of**

**Math: **var pi_value=Math.PI;

var
sqrt_value=Math.sqrt(16);

**Mathematical Constants**

JavaScript provides eight mathematical constants
that can be accessed from the Math object. These are: E, PI, square root of 2,
square root of 1/2, natural log of 2, natural log of 10, base-2 log of E, and
base-10 log of E.

**Mathematical Methods**

In
addition to the mathematical constants that can be accessed from the Math
object there are also several methods available.The following example uses the
round() method of the Math object to round a number to the nearest integer:

document.write(Math.round(4.7)); The code above
will result in the following output: 5

**JavaScript RegExp Object**

RegExp,
is short for regular expression.

**Complete RegExp Object Reference**

For a complete reference of all the properties and
methods that can be used with the RegExp object, go to our complete RegExp
object reference.The reference contains a brief description and examples of use
for each property and method!

**What is RegExp?**

A regular expression is an object that describes a
pattern of characters.When you search in a text, you can use a pattern to
describe what you are searching for.A simple pattern can be one single
character.A more complicated pattern can consist of more characters, and can be
used for parsing, format checking, substitution and more.Regular expressions
are used to perform powerful pattern-matching and
"search-and-replace" functions on text.

**Syntax**

var
txt=new RegExp(pattern,modifiers);

or more
simply:

var
txt=/pattern/modifiers;

pattern
specifies the pattern of an expression

modifiers
specify if a search should be global, case-sensitive, etc.

**RegExp Modifiers**

Modifiers are used to perform case-insensitive and
global searches.The i modifier is used to perform case-insensitive matching.The
g modifier is used to perform a global match (find all matches rather than
stopping after the first match).

**JAVASCRIPT**

**DEBUGGERS Firebug**

__Firebug__ is a powerful extension for Firefox that has many
development and debugging tools including JavaScript debugger and profiler.

**Debugging Methods**

Debugging in Javascript doesn't differ very much
from debugging in most other programming languages. See the article at Computer
programming/debugging.

**Browser Bugs**

Sometimes
the browser is buggy, not your script. This means you must find a workaround.

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