How do I export an array with module.exports in node js?

Question

I have a project using node.js. It's my first time using nodejs and I want to export an array to my app. Here is some code:

module.exports = { 
    var arrays = [];
    arrays[0] = 'array 0';
    arrays[1] = 'array 1';
    arrays[2] = 'array 2';
    arrays[3] = 'array 3';
    arrays[4] = 'array 4';
    var r_array = arrays[Math.floor(Math.random() * arrays.length)].toString();
}

At the end I want to use the var r_array in my app.js but I don't know how.

Please, use Arrays the proper / simpler way: `const arrays = ["a", "b", /*etc*/ ];` — Roko C. Buljan, Apr 02 '22 at 19:22

FatalMerlin · Accepted Answer · 2019-05-07T20:49:54.320

You'd want to define a function which returns the randomized portion of the array:

module.exports = {
  getRArray: function() {
    var arrays = [];
    arrays[0] = 'array 0';
    arrays[1] = 'array 1';
    arrays[2] = 'array 2';
    arrays[3] = 'array 3';
    arrays[4] = 'array 4';
    return arrays[Math.floor(Math.random()*arrays.length)];
  }
};

Also you should embed the array into the function so it actually returns something.

score 5 · Answer 2 · answered Dec 19 '16 at 09:01

module.exports needs to be an object.

Perhaps you're looking for something more like:

var arrays = [];
arrays[0] = 'array 0';
arrays[1] = 'array 1';
arrays[2] = 'array 2';
arrays[3] = 'array 3';
arrays[4] = 'array 4';
var r_array = arrays[Math.floor(Math.random()*arrays.length)].toString();

module.exports = r_array;

Please note that this code will only be run once, and that if you're hoping to get a different random value by executing the code multiple times, that you may want to set it up more like:

module.exports = function() {
  return arrays[Math.floor(Math.random()*arrays.length)];
}

so that the Math.random() operation happens over and over.

score 0 · Answer 3 · answered Dec 19 '16 at 09:01

0

var arrays = [];
arrays[0] = 'array 0';
arrays[1] = 'array 1';
arrays[2] = 'array 2';
arrays[3] = 'array 3';
arrays[4] = 'array 4';
var r_array = arrays[Math.floor(Math.random()*arrays.length)].toString();
module.exports = r_array;

answered Dec 19 '16 at 09:01

feychu

1,284
1
14
33

okay thank you! but i have an additional question. then there is only one random array. how do i have to do it if i want every time another array? :) – Limatuz Dec 19 '16 at 09:06
You should check @therobinkim answer. But note that you are not going to get a random array every time if you are applying `toString` to the result. This means the value will be translated into a string, so you'll get a random string every time. – feychu Dec 19 '16 at 09:14

anonymoustafa · Answer 4 · 2022-06-21T04:55:06.007

You have two files, one is array.js and the other app.js. Consider doing this in array.js file:

const Array= [
    'array 0',
    'array 1',
    'array 2',
    'array 3',
    'array 4']
   
exports.Array = Array

Now in your app.js do the following:

const { Array } = require("./array")

const randomArr = Array[Math.floor(Math.random()*Array.length)]
console.log(randomArr)
 // I used randomArr  instead of r_array because of JS conventions.

score 0 · Answer 5 · answered Apr 11 '23 at 20:47

Try it like this , if you are using type : "module" in package.json

const myArray = [
       {
            name: 'Cake',
            value: 'cake'
        },
        {
            name: 'Veg thali',
            value: 'vegthali'
        }
]

export default myArray

import myArray from "./arrayfile.js"

How do I export an array with module.exports in node js?

5 Answers5

Linked