code: function _fnMap( ret, src, name, mappedName )
  	{
  		if ( $.isArray( name ) ) {
  			$.each( name, function (i, val) {
  				if ( $.isArray( val ) ) {
  					_fnMap( ret, src, val[0], val[1] );
  				}
  				else {
  					_fnMap( ret, src, val );
  				}
  			} );
  	
  			return;
  		}
  	
  		if ( mappedName === undefined ) {
  			mappedName = name;
  		}
  	
  		if ( src[name] !== undefined ) {
  			ret[mappedName] = src[name];
  		}
  	}
docs: See if a property is defined on one object, if so assign it to the other object
  @param {object} ret target object
  @param {object} src source object
  @param {string} name property
  @param {string} [mappedName] name to map too - optional, name used if not given
  @memberof DataTable#oApi