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Here’s a prototype method for the Array object that allows you to get the unique values in an array!

Array.prototype.unique = function() {

   var seen = {};
   var unique = [];

   for ( var i = 0; i < this.length; i++ ) {
      if ( !seen[ this[i] ] ) {
         unique.push( this[i] );
         seen[ this[i] ] = true;
      }
   }

   return unique;
};

var list = [ 1, 1, 1, 2, 2, 3, 4, 4, 5 ];
list = list.unique();
// Now list is [ 1, 2, 3, 4, 5 ]