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JavaScript array remove duplicate
Posted on: November 10, 2008 at 12:00 AM

In JavaScript array we can also detect and remove the duplicate elements by creating a user defined function.

JavaScript array remove duplicate

In JavaScript array we can also detect and remove the duplicate elements by creating a user defined function. Since there is not any built-in method in the JavaScript array to remove duplicate elements therefore we have created a function which will remove all the duplicated elements from the passed array. Code for the defined function is as given below:


function removeDuplicateElement(arrayName)

  {

  var newArray=new Array();

  label:for(var i=0; i<arrayName.length;i++ )

  {  

  for(var j=0; j<newArray.length;j++ )

  {

  if(newArray[j]==arrayName[i]) 

  continue label;

  }

  newArray[newArray.length] = arrayName[i];

  }

  return newArray;

  }

In this removeDuplicateElement(arrayName) we have passed the arrayName (Array Object) at which the operation is to be performed. Here is the full HTML example code as follows:

javascript_array_remove_duplicate.html


<html>

  <head>

  <title>

  JavaScript array remove duplicate element

  </title>

  <script type="text/javascript">

  var arr = new Array(7);

  arr[0]="Rose";

  arr[1]="India";

  arr[2]="Technologies";

  arr[3]="Pvt";

  arr[4]="Ltd";

  arr[5]="India";

  arr[6]="Rose";

  function removeDuplicateElement(arrayName)

  {

  var newArray=new Array();

  label:for(var i=0; i<arrayName.length;i++ )

  {  

  for(var j=0; j<newArray.length;j++ )

  {

  if(newArray[j]==arrayName[i]) 

  continue label;

  }

  newArray[newArray.length] = arrayName[i];

  }

  return newArray;

  }

  document.writeln("Array before calling removeDuplicateElement()

       method is =<b>"+arr+"</b></br>");

  document.writeln("Array after calling removeDuplicateElement()

       method is =<b>"+removeDuplicateElement(arr)+"</b></br>");

  </script>

  </head>

<body bgcolor="#ddcdff">

  <h2>

  JavaScript Array Remove duplicate element

  </h2>

</body>

</html>

Output of example:

Download Sample Code

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