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

queue.push(20); // [10, 20]
queue.shift(); // [20] Returns 10
queue.shift(); // [] Returns 20
Even if you never use arrays as stacks or queues, the methods discussed in this section can
come in handy to manipulate the contents of arrays. Now let‘s look at a few more useful array
manipulations.
Note As mentioned at the start of the chapter, these methods require JavaScript 1.2 or JScript
5.5 or better. Internet Explorer 5 and earlier will not be able to natively use these features.
However, using an Array prototype to add our own pop() and push() methods can fix this
problem. See the section entitled ―Extending Arrays with Prototypes,‖ later in this chapter.
Manipulating Arrays
JavaScript provides a wealth of methods for carrying out common operations on arrays. This
section provides an overview of these Array methods with a brief discussion of some of their
quirks.
concat() Method
The concat() method returns the array resulting from appending its arguments to the array on
which it was invoked. Given the script:
var myArray = ["red", "green", "blue"];
alert(myArray.concat("cyan", "yellow"));
the expected larger array is shown here:
Be careful, though; concat() does not modify the array in place. Notice the output of this script,
var myArray = ["red", "green", "blue"];
myArray.concat("cyan", "yellow");
alert(myArray);
which is shown here: