Prototype - compact() Method

This method returns a new version of the array, without any null/undefined values.

Syntax

array.compact();

Return Value

Returns a new array without any null of undefined values.

Example

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function showResult() {
            var oldArr =['Sam','Justin','Andrew','Dan', null, undefined];
            alert("Guys in old Arr" );
            
            oldArr.each(function(item) {
               alert(item );
            });
            var newArr = oldArr.compact();
            alert("Guys in new Arr" );
            
            newArr.each(function(item) {
               alert(item );
            });
         }
      </script>
   </head>

   <body>
      <p>Click the button to see the result.</p>
      <br />
      <br />
      <input type = "button" value = "Result" onclick = "showResult();"/>
   </body>
</html>

Output

prototype_array_processing.htm