Page 82 - DCAP202_Fundamentals of Web Programming

Unit 6: Introduction to JavaScript

However, what if you want to loop through the cars and find a specific one? And what if you had Notes
not 3 cars, but 300?
The best solution here is to use an array!

Notes An array can hold all your variable values under a single name. And you can access
the values by referring to the array name.
Each element in the array has its own ID so that it can be easily accessed.

6.9.1 Creating Arrays

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)
m y C a r s [ 1 ] = ” F e r a r i ” ;
myCars[2]=”BMW”;
2:
var myCars=new Array(“Mercedes”,” Ferari “,”BMW”); // condensed array
3:
var myCars=[“ Mercedes “,” Ferari “,”BMW”]; // literal array

!
Caution If you specify numbers or true/false values inside the array then the variable type
will be Number or Boolean, instead of String.

6.9.2 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
6.9.3 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

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