Javascript : Array

There are three ways of defining an array:

1) regular array. Pass an optional integer argument to control array’s size.
var myfriends=new Array()
myfriends[0]=”John”
myfriends[1]=”Bob”
myfriends[2]=”Sue”

2) condensed array

var myfriends=new Array(“John”, “Bob”, “Sue”)

3) literal array

var myfriends=["John", "Bob", "Sue"]

Multi-Dimensional Arrays

Since an Array can store other Arrays you can get the benefit of multi-dimension arrays.

var x=[0,1,2,3,4,5];
var y=[x];
In the above example we created an array named x and assigned it as the first element in the array y. If we ask for the value of y[0] it will return the contents of x as a string because we didn’t specify an index.

var x=[0,1,2,3,4,5];
var y=[x];
document.writeln(y[0]); // Will output: 0,1,2,3,4,5

If we wanted the third index we’d access it this way

var x=[0,1,2,3,4,5];
var y=[x];
document.writeln(y[0][3]); // Will output: 2

There’s no defined limit to how many Arrays you can nest in this manner. For instance

document.writeln(bigArray[5][8][12][1])

would indicate bigArray’s 5th index held an array, who’s 8th index held an array, who’s 12th index held an array, who’s first index contains the data we want.

Array Length: Array can be iterated like below

for (var i=0; i<myArray.length; i++) {
}

Using java.util.logging

import java.util.logging.*;

Define a static variable in class of type import java.util.logging.Logger

final static Logger logger = Logger.getLogger(MyLoggingClass.class.getName());

Use logging as below

logger.log(Level.INFO,”getUserDetails | userID=”+userID);

The output will come like this on console

[3/11/08 13:58:41:531 SGT] 00000037 MyLoggingClas I getUserDetails | userID=webmaster

Note the name of class name is coming by itself because it was passed in getLogger() method. Different levels of logs like SEVER, FINER, INFO etc can be used depending upon the requirement.