JAVASCRIPT

More on JavaScript Array Objects

Thanks for dropping by for another episode of our series on JavaScript Array Objects. We left off discussing five of the thirteen array objects JavaScript has to offer. Here, in this issue, we will make an effort to cover the remaining eight.

Author Info:

By: James Payne

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December 16, 2008

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Slice() is another useful object. It consists of two parameters, one of which is required (start) and the other of which is not (end). It is used to retrieve and return elements in an array starting from the index number you specify and ending either where you specify, or at the end of the array if you do not specify an ending number.

In this first example we are going to slice() out some names from our fat people array. Before we do, however, just remember: the first element in an array starts with index number 0; so therefore, the second element would be 1, the third 2, and so forth:

<html>

<body>

var fat = new Array(4);

fat[0] = "John Candy";

fat[1] = "Me";

fat[2] = "Valerie Bertinelli";

fat[3] = "Steven Segal";

document.write("Here is a list of fat dudes:");

document.write("<br />" + "<br />");

document.write(fat + "<br />" + "<br />");

document.write("These two are the hottest:" + "<br />");

document.write(fat.slice(1,3) + "<br />" + "<br />");

document.write("Here is the array again; no one was removed:" + "<br />");

document.write(fat);

</script>

</body>

</html>

Here, we have created our array of fat guys and printed them out. Next, we used slice() to print the two hottest people in the list. Note that when we typed fat.slice(1,3), it prints the elements 1 and 2, but not three, as three is the stopping point. Here is the result:

Here is a list of fat dudes:

John Candy,Me,Valerie Bertinelli,Steven Segal

These two are the hottest:
Me,Valerie Bertinelli

Here is the array again; no one was removed:
John Candy,Me,Valerie Bertinelli,Steven Segal

Note that had we not told the program to stop at 3, or specified a stopping number at all, as in the following example, it would have printed all the of the elements that appeared after index 1. Here is the code and the result: