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Define a function

  var ... = function( ... ){ ... };
named generate

  var generate = function( ... ){ ... };
that takes one argument, a function f

  var generate = function( f ){ ... };
It should return an array

  var generate = function( f ){ return [ ... ]; };
that consists of the function f

  var generate = function( f ){ return [ f, ... ]; };
and another function

  var generate = function( f ){ return [ f, function( ... ){ ... } ]; };
that doubles its input

  var generate = function( f ){ return [ f, function( x ){ return 2*x; } ]; };



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

var generate = function (f) {

    function double(x){return x * 2;}
    
    var list = [f,double];
     return list;
};


I'm sorry I can't. I'm not into the details of Javascript (yet) and know nothing about JSLint.




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