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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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