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JavaScript arrays: copying, transferring and merging


This series of articles mainly concentrates on working with JavaScript arrays. This is the third article in the series. It 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 / 34
March 14, 2006
TABLE OF CONTENTS:
  1. · JavaScript arrays: copying, transferring and merging
  2. · How to copy the elements of one array into another using JavaScript: discussion
  3. · How to transfer the elements of one array into another using JavaScript
  4. · How to merge two arrays into a single array using JavaScript
  5. · How to merge two arrays into a single array using JavaScript: discussion

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JavaScript arrays: copying, transferring and merging - How to copy the elements of one array into another using JavaScript: discussion
(Page 2 of 5 )

Within the code I showed you in the previous section, I mainly created a simple button (which is identified as “Button1”).  The button is defined with an “onclick” event which calls a JavaScript function, “Button1_onclick.”  The same function simply calls another JavaScript function named “Show.”

The function “Show” is defined as follows:

functionShow()

{

      var SimpleString = "abc;def;ghi;jkl;mno;qrs";

      var myArray = SimpleString.split(";");

      var subArray = myArray.slice(0,3);

      document.write("first array<br>---------<br>");

      for (var i = 0; i < myArray.length; i++)

      {

            document.write(myArray[i] + "<BR>");

      }

      document.write("<br>second array<br>---------<br>");

      for (var i = 0; i < subArray.length; i++)

      {

            document.write(subArray[i] + "<BR>");

      }

}

In the above code fragment, I worked with a sample string as follows:

      var SimpleString = "abc;def;ghi;jkl;mno;qrs";

From the above statement, we can easily determine that the “separator” for the elements would be “;” or semi-colon (as explained in my second article in this series).  Proceeding further we have the following:

      var myArray = SimpleString.split(";");

The above statement makes the string split into several elements, based on the separator “;” (semi-colon).  Once the splitting is completed, it creates an array of those elements and assigns the same to the variable “myArray.” Continuing on, we have the following:

      var subArray = myArray.slice(0,3);

The above statement creates a new array with only three elements (copied from  the 0th location or index) from the main array “myArray” and finally assigns the same to “subArray.”

We use the following loop to display all the elements (as explained in my first article):

      for (var i = 0; i < subArray.length; i++)

      {

            document.write(subArray[i] + "<BR>");

      }

I also displayed the elements available in the first array using the following loop:

      for (var i = 0; i < myArray.length; i++)

      {

            document.write(myArray[i] + "<BR>");

      }


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