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JavaScript Arrays: Pushing, Popping and Shifting


This series of articles mainly concentrates on working with JavaScript arrays. This is the fourth article in the series and mainly concentrates on working with multiple arrays effectively. You can reuse these scripts to inject into server side controls easily (especially in .NET and Java).

Author Info:
By: Jagadish Chaterjee
Rating: 4 stars4 stars4 stars4 stars4 stars / 35
March 21, 2006
TABLE OF CONTENTS:
  1. · JavaScript Arrays: Pushing, Popping and Shifting
  2. · How to append an element to an array using JavaScript: discussion
  3. · How to pop (or delete at end) an element from an array using JavaScript
  4. · How to delete an element at the top from an array using JavaScript
  5. · How to add an element to the top of an array using JavaScript

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JavaScript Arrays: Pushing, Popping and Shifting - How to delete an element at the top from an array using JavaScript
(Page 4 of 5 )

In this section I focus on “shifting” (also called “deleting” from the beginning) an element from an array.

Now, let us try to develop a simple script (JavaScript) which deletes (or shifts) a single element at the beginning of an array.  Have a look at the following code:

<html>
      <head>
            <meta  name=vs_targetSchema  content="http://schemas.microsoft.com/intellisense/ie5">
<script  id="clientEventHandlersJS"  language="javascript">
<!--
function Show()
{
      var myArray = new Array();
      myArray[0] = "Jag";
      myArray[1] = "Chat";
      myArray[2] = "Win";
      myArray[3] = "Dhan";
      document.write("Before shifting<br>-------------<br>");
      for (var i = 0; i < myArray.length; i++) 
      {
            document.write(myArray[i] + "<BR>");
      }
      myArray.shift();
      document.write("<br>After shifting<br>-------------<br>");
      for (var i = 0; i < myArray.length; i++) 
      {
            document.write(myArray[i] + "<BR>");
      }
}

function Button1_onclick() {
      Show();
}
//-->
            </script>
      </head>
      <body>
      <form  id="form1">
                  <input  type="button"  value="Show"  id="Button1"  name="Button1"  onclick="return Button1_onclick()">
            </form>
      </body>
</html>

When the above code is executed, the following output is generated.

Before shifting
-------------
Jag
Chat
Win
Dhan

After shifting
-------------
Chat
Win
Dhan

The above code is very similar to the code available in previous section with only the following change:

      myArray.shift();

Earlier, in the previous section, I used the “pop” method.  When we apply “pop,” the last element (or the latest element added at the end of the array) gets deleted from the array automatically.  But when we apply “shift,” the first element present in the array gets deleted.  Apart from this difference, the rest of the code is quite similar.


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