Page 161 - DCAP202_Fundamentals of Web Programming

Fundamentals of Web Programming

Notes 2. The ............................ object is useful when you want to display a date or use a timestamp in
some sort of calculation.
3. A ............................. is a value or set of values (in the form of an array or object) that is a
member of an object.
4. A ............................ is a function that is a member of an object.

13.2 String Object

The String object let’s you work with a series of characters and wraps Javascript’s string primitive
data type with a number of helper methods.
Because Javascript automatically converts between string primitives and String objects, you can
call any of the helper methods of the String object on a string primitive.

Syntax

Creating a String object:
The string parameter is series of characters that has been properly encoded.
String Properties:

Here is a list of each property and their description.
Property Description
constructor Returns a reference to the String function that created the object.

length Returns the length of the string.
prototype The prototype property allows you to add properties and methods to an
object.

Task Illustrate the use of string object with example.

13.2.1 Chaining Methods

JavaScript provides all sorts of shortcut ways of specifying your code which makes the code
quicker to write. One of these that relates to objects is the chaining together of two or more
methods which need to be run on the same object. Instead of having to specify the object on the
front of each method as we want to run it, we can chain all the methods together one after the
other on the one object reference.

!
Caution We just need to define the methods the right way in order to allow it.
Let’s look at an example of this to see how it works. Here’s a section of the code where we
define an object and then run several methods on the object.
var newB = new example();
newB.firstMethod(‘x’);
newB.secondMethod(‘y’);
newB.thirdMethod(1,15,’z’);

154 LOVELY PROFESSIONAL UNIVERSITY