JavaScript 2.0-The Complete Reference, Second ... - freecodingtutorial

alert(myArray[2]);
alert(myArray[3]);
In the previous example, we created an Array object using an array literal. We could have also
used the new operator to do so. For example:
var myArray = new Array(2, 4, 8, 10);
The new operator is used to create objects. It can be used both to create user-defined objects
and to create instances of built-in objects. The following script creates a new instance of the
Date object and places it in the variable today.
var today = new Date();
alert(today);
The result is shown here:
Most languages that allow you to create an object with new allow you to destroy one with
delete. This isn‘t quite true of JavaScript. To destroy an object, you set it to null. For example,
to destroy the object in the previous example, you would write
today = null;
In JavaScript, the delete operator is used to remove a property from an object and to remove
an element from an array. The following script illustrates its use for the latter purpose:
var myArray = ['1', '3', '78', '1767'];
document.write("myArray before delete = " + myArray);
document.write("");
delete myArray[2];
// deletes third item since index starts at 0
document.write("myArray after delete = " + myArray);
Notice that the third item, 78, has been removed from the array: