denest.js - a method to flatten an array which possibly contains more arrays

denest.js

/** 
 * denest
 * 
 * This function will take an array with possible nested arrays
 * and flatten it
 *
 * provided:  Array of values, possibly containing more arrays
 * result:    Array of values, as taken from provided in order to 'flatten' its values. This
 *            argument is available when this method calls itself.
 *
 * Returns    result (Array) - The provided array as it would be if it were 'flattened'.
 */
function denest( provided, result )
{
    if( !result )
    { 
        result = [];
    }
  
    for( var i=0; i < provided.length; i++ )
    {
        if( provided[i].constructor == Array )
        {
            denest( provided[i], result );        
        }
        else
        {
            result.push( provided[i] );
        }
    }
  
    return result;
}