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JavaScript: Array Objects


We left off a while back discussing the various built-in Date Objects that JavaScript has to offer. Prior to that we talked about String Objects and JavaScript Events. Here and now, we are going to go over the Array Objects, which we can use to manipulate arrays. We will start off by viewing a table of them and the definitions of each. After that we will begin with the concat() method and try our best to work our way through the remaining thirteen.

Author Info:
By: James Payne
Rating: 4 stars4 stars4 stars4 stars4 stars / 5
June 02, 2008
TABLE OF CONTENTS:
  1. · JavaScript: Array Objects
  2. · Join() Hands
  3. · Pop() and Lock
  4. · Using Pop() to Assign a Value to a Variable
  5. · Put It In Reverse()

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JavaScript: Array Objects - Using Pop() to Assign a Value to a Variable
(Page 4 of 5 )

You can also use the pop() function to assign a value to a variable, like so:


<html>

<body>

<script type="text/javascript">

var bboys = new Array(3);

bboys[0] = "Greg";

bboys[1] = "Bobby";

bboys[2] = "Peter";

yeah=bboys.pop();

document.write(yeah);

</script>

</body>

</html>

Here we have the result:

  Peter

Push() Damn You Push!

Just as we use pop() to remove an element, we use push() to add one (or more) elements to the right side (or end) of an array and then print out the modified array length. Here is an example in which a Brady nightmare comes true and Michael Jackson joins the family:


<html>

<body>

<script type="text/javascript">

var bboys = new Array(3);

bboys[0] = "Greg";

bboys[1] = "Bobby";

bboys[2] = "Peter";

document.write("Behold the Brady Boys: " + "<br />");

document.write(bboys.push("Michael Jackson") + "<br />");

document.write(bboys);

</script>

</body>

</html>

This prints out:

  Behold the Brady Boys:
  4
  Greg,Bobby,Peter,Michael Jackson

Of course, we can also add more than one element to the array, as we do in this nightmarish scenario:


<html>

<body>

<script type="text/javascript">

var bboys = new Array(3);

bboys[0] = "Greg";

bboys[1] = "Bobby";

bboys[2] = "Peter";

document.write("Behold the Brady Boys: " + "<br />");

document.write(bboys.push("Michael Jackson","Tito Jackson","Fred Savage") + "<br />");

document.write(bboys);

</script>

</body>

</html>

This changes the length of the array, and prints out:

  Behold the Brady Boys:
  6
  Greg,Bobby,Peter,Michael Jackson,Tito Jackson,Fred Savage

Note that the 6 that gets printed out is the new size of our array.


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