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