Example of progressive abstraction for routes in a Node Express application.

Abstracting Routes

// OPTION 1
router.get('/user', function(req, res) {
    res.send('yay')
})




// OPTION 2
function getUser(req, res) {
    res.send('yay')
}
router.get('/user', getUser)




// OPTION 3
const getUser = function(req, res) {
    res.send('yay')
}
router.get('/user', getUser)



// OPTION 4

const UserController = {
    getUser: function(req, res) {
        res.send('yay')
    }
}


router.get('/user', UserController.getUser)


// OPTION 5

    // /controllers/UserController.js
    module.exports = {
        login: function(req, res) {
            res.send('yay')
        },
        register: function(req, res) {

        }
    }



    // routes/index.js
    const UserController = require('./../controllers/UserController.js')
    router.get('/user', UserController.getUser)