Page 147 - DCAP408_WEB_PROGRAMMING

Unit 5: Scripting Language

Each element in the array has its own ID so that it can be easily accessed. Notes
 Create an Array
An array can be defined in three ways.
The following code creates an Array object called myCars:
1:
var myCars=new Array(); // regular array (add an optional integer
myCars[0]=”Mercedes”; // argument to control array’s size)
myCars[1]=”Ferari”;

myCars[2]=”BMW”;
2:
var myCars=new Array(“Mercedes”,”Ferari”,”BMW”); // condensed array
3:
var myCars=[“Mercedes”,”Ferari”,”BMW”]; // literal array

Notes Note: If you specify numbers or true/false values inside the array then the variable
type will be Number or Boolean, instead of String.
 Access an Array
You can refer to a particular element in an array by referring to the name of the array and
the index number. The index number starts at 0.
The following code line:
document.write(myCars[0]);
Will result in the following output:

Mercedes
 Modify Values in an Array
To modify a value in an existing array, just add a new value to the array with a specified
Index number:
myCars[0]=”Opel”;
Now, the following code line:
document.write(myCars[0]);

will result in the following output:
Opel

Table 5.3: Array Object Methods

Method Description
concat() Joins two or more arrays, and returns a copy of the joined arrays
join() Joins all elements of an array into a string
Contd...

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