refactor NodeJs functions

Question

I have a big app.js file and want to split the code. I took all my routes into a module called routes.js

module.exports = function(app){

app.get('/', function (req, res) {
  res.redirect('/page1');
});

app.get('/page1', function (req, res) {
  res.render('page1');
});

app.get('/page2/:id', function (req, res) {
    res.render('page2', {
      val: Number(req.params.id)
    });
});

}

and in my app.js I call

const routes = require('./Server/routes')(app);

So this works fine.

I have some functions like

function loadData(id, callback) {
  fs.readFile('./database.json', 'utf8', function (err, data) {
    var json = JSON.parse(data);
    var arr = json.arr;
    var obj = arr.find(e => e.id === Number(id));
    callback(obj);
  });
}

and want to have them in separate files too. How can I do this? I am able to export one function but how can I export more than one?

Like

module.exports = function(){

function sayHello(){
   console.log("Hello");
}

function calc(){
   return 5 + 7;
}

}

require the module and call

myModule.sayHello();

var num = myModule.calc();

Here you go. Let me know if this is what you asked for.

oneturkmen
– oneturkmen

2017-11-29 08:03:16 +00:00
Commented Nov 29, 2017 at 8:03 — oneturkmen
– oneturkmen, Commented Nov 29, 2017 at 8:03
I think so, is this correct? hastebin.com/unobutifem.js

peterHasemann
– peterHasemann

2017-11-29 08:07:14 +00:00
Commented Nov 29, 2017 at 8:07 — peterHasemann
– peterHasemann, Commented Nov 29, 2017 at 8:07

Farnabaz · Accepted Answer · 2017-11-29 08:11:18Z

3

In your new module you can export an object and define your functions inside object

module.export = {
    sayHello: function() {
        console.log("Hello");
    },
    calc: function() {
        return 5 + 7;
    }
}

// usage: const mymodule = require('path/to/your/file');

also you can export a function and define your needed functions in prototype

function mymodule(someArgsIfNeeded) {
    // do some initialization
}

mymodule.prototype.sayHello = function() {
    console.log("Hello");
}
mymodule.prototype.calc = function() {
    return 5 + 7;
}

module.export = mymodule

// usage: const mymodule = require('path/to/your/file')(someArgsIfNeeded);

edited Nov 29, 2017 at 8:11

answered Nov 29, 2017 at 8:07

Farnabaz

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1 Comment

peterHasemann Over a year ago

ah okay, this syntax is new to me

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