Your Answer is superb but can you tell me what is wrong with this var generate = function (f) { var double = function (x){return x * 2;}; var list

Your Answer is superb but can you tell me what is wrong with this var generate = function (f) { var double = function (x){return x * 2;}; var list = [f,double]; return list; }; On the other hand this one passes the JSLInt test given here at : http://nathansjslessons.appspot.com/lesson?id=1050 http://nathansjslessons.appspot.com/lesson?id=1050 var generate = function (f) { function double(x){return x * 2;} var list = [f,double]; return list; };