How to pass information from function to function

Passing info function to function

// Once you get to next(); it moves on to the next function and lets go of whatever information was captured there. 
// for instance mariaItem finds the item with that particular _id and when it hits the next(); that information is gone...
// UNLESS
// You add a req.contents = {}; with that you are adding to the request hash a contents key and {} value.
// It always will pass the req, res, option for next.
// Next you add a result key with a result value. (The result value holds the the work of findOne).
// So that information is now stored in the res hash and when the computer goes to next function it takes that info with it.

   var mariaItem = function (req, res, next) {
        Item.findOne({ _id: "5099803df3f4948bd2f98391"}, function (err, result){
            req.contents = {}; 
            req.contents.result = result;
            next();
        });
    };
    
// The function below gets another item fro the DB and adds the result to the req hash as it did above, 
// this time the key is called 'bananas'...inside toe contents hash...
// Now you ask it to display req.contents in json by calling res.json(req.contents)
// The req.contents contains the first functions findOne and the second functions findOne, shown when you hit /maria/item route. // so we are rendering a contents hash with two key value pairs.

   var mariaTwo = function (req, res, next) {
        Item.findOne({_id: "5099803df3f4948bd2f98392"}, function (err, result){
            req.contents.bananas = result;
            res.json(req.contents);
        });
    };

    
     app.get('/maria/item',
        mariaItem,
        mariaTwo
        );