JavaScript / How create a new object in node.js?

Question

I have the following code in node.js, using express:

app.post('/printUp', function(req, res) {
    var multipl = new require('./multUploud').printNum(req, res);
})

and i have the following in my multUploud.js:

var partNum = 0;
module.exports = {
     printNum: function (req, res){
        partNum ++;
        console.log(partNum);
    }
}

If I sent two commands of post, I see that partNum is 1 in the first iteration, and 2 in the second.

is there any option to create a new instance for every app.post request, so it prints 1 and 1?

What's the new doing there?

Bergi
– Bergi

2014-04-28 15:16:12 +00:00
Commented Apr 28, 2014 at 15:16 — Bergi
– Bergi, Commented Apr 28, 2014 at 15:16

bredikhin · Accepted Answer · 2014-04-28 15:40:51Z

2

Just make partNum a property of your object. Your multUploud.js should look somewhat like that:

module.exports = MultiUpload;

function MultiUpload() {
  this.partNum = 0;
}

MultiUpload.prototype.printNum = function (req, res) {
  this.partNum++;
  console.log(this.partNum);
}

Then, in your Express post:

app.post('/printUp', function(req, res) {
    var MultiUpload = require('./multUploud');
    var multipl = new MultiUpload();
    multipl.printNum(req, res);
})

edited Apr 28, 2014 at 15:40

answered Apr 28, 2014 at 15:10

bredikhin

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4 Comments

Or Smith Over a year ago

and the call to the method is the same?

bredikhin Over a year ago

Yes, everything else is the same.

Or Smith Over a year ago

It writes the there is no method printNum for this object

bredikhin Over a year ago

Oh, there's a pair of braces missing: var multipl = new require('./multUploud')().printNum(req, res);. I updated the answer with a cleaner version of the code.

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