How to call another javascript inside Main JS File

Question

I'm using Javascript without HTML, just JavaScript with Node and I need some other js files so it does not take up too much space on the main file. And I was looking for, and I found something like "module.exports", but I did not understand it so well, can anyone explain this to me?

I've tried this

var xgr = require("./xgr.js").randomString;
randomString();

In the other file

function randomString() {
	var carac = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	var rand = Math.floor(Math.random() * carac.length);
	var gerado = carac[rand];
	return gerado;
}

module.exports = randomString;

It should be xgr() instead of randomString() because that is the name you gave to the function when you've imported it. — Titus
– Titus, Commented Apr 26, 2017 at 14:37
sitepoint.com/understanding-module-exports-exports-node-js take a look at this. Explains it well. — Francisco
– Francisco, Commented Apr 26, 2017 at 14:38
@JasonKrs What part of "without HTML" and "node" did you have trouble understanding? — user663031
– user663031, Commented Apr 26, 2017 at 14:40
That first comment is not quite right, see the bottom of the answer by @T.J. Crowder — aw04
– aw04, Commented Apr 26, 2017 at 14:42

T.J. Crowder · Accepted Answer · 2017-04-26 14:39:04Z

The Node documentation on modules goes into this in a fair amount of detail.

Essentially, exports (also available as module.exports) is a predefined object in a module you can add properties to that you want to export. (Or you can replace the whole thing if you prefer.)

require retrieves the exports of the file you require.

So if a.js is:

exports.foo = function() {
    console.log("Hi there");
};

and b.js has

var a = require("./a");

then

a.foo();

...outputs "Hi there".

With your example xgr.js:

function randomString() {
    var carac = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    var rand = Math.floor(Math.random() * carac.length);
    var gerado = carac[rand];
    return gerado;
}

module.exports = randomString;

you're replacing exports entirely. You'd use it like this:

var randomString = require("./xgr.js");

console.log(randomString());

Pedro Muniz · Accepted Answer · 2017-04-26 14:49:07Z

0

That's a good way to share your functions between components

var _public = exports;
_public.randomString = function () {
    let carac = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    let rand = Math.floor(Math.random() * carac.length);
    let gerado = carac[rand];
    return gerado;
}

So you can use all your shared functions like this

let xgr = require("./xgr.js");
xgr.randomString();

answered Apr 26, 2017 at 14:49

Pedro Muniz

57814 silver badges22 bronze badges

Collectives™ on Stack Overflow

How to call another javascript inside Main JS File

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related