Export array to be used in another javascript file

Question

In my post request, I want to check if thisString exists in another javascript file array.

Array.js

exports.names = [
    'John',
    'Mary'
]

Main.js

if (names.includes(thisString)) {
    ...do stuff...
}

if thisString = Mary, Main.js returns "undefined". If I console.log(names) it returns the array. But console.log(names[0]) is undefined. And If I copy and paste the array into the Main.js file it works as intended.

I want to have the array in another file just to clean things up a bit. But what am I doing wrong?

@Leo Yes.... is that a problem? I want to access it from multiple files. — John107
– John107, Commented Feb 5, 2019 at 10:28

Abderrahim Soubai-Elidrisi · Accepted Answer · 2019-02-05 10:20:01Z

34

Typescript :

Array.ts

export let array = [1,2,3];

Main.ts

import {array} from "./Array.ts"
array.map(item => console.log(item +1))

Javascript (nodejs)

array.js

exports.array =  [1,2,3];

main.js

let module = require('./array.js');

let array = module.array;

array.map(item => console.log(item +1))

answered Feb 5, 2019 at 10:20

Abderrahim Soubai-Elidrisi

5,2621 gold badge31 silver badges41 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Mukesh Rawat · Accepted Answer · 2019-02-05 10:49:31Z

4

The below works for me. You could also try:

Array.js

exports.names = [
    'John',
    'Mary'
]

Main.js

const data = require('./array.js');

const thisString = 'Mary';
if (data && data.names && data.names.includes(thisString)) {
    console.log('You are in!');
}

answered Feb 5, 2019 at 10:49

Mukesh Rawat

2,0871 gold badge17 silver badges31 bronze badges

3 Comments

John107 Over a year ago

this 'should' work, but returns undefined in my application. I am unsure why.

Mukesh Rawat Over a year ago

Strange! In my solution I am assuming your array.js and main.js are in same folder, otherwise you need to modify the import path.

John107 Over a year ago

Yes it's very strange! I have the correct path for the array.js so I'm not sure what's going wrong.

curtis Arrisol · Accepted Answer · 2023-12-29 06:19:07Z

0

Best solution for me is to export like so:

array.js

export const names = [
  'john',
  'James',
  'Jeff'
];

in main.js Import variable as a named-import

import { names} from './array.js'
console.log(names)

//Output => ['john', 'James', 'Jeff']

With this method you can import multiple variables from a file as long as you export them. However if you're exporting multiple variable from the same file its best to follow this convention:

export { x, y, z };
const x = 1;
const y = ['a', 'b'];
const z = {"name": "James",};

answered Dec 29, 2023 at 6:19

curtis Arrisol

936 bronze badges

Collectives™ on Stack Overflow

Export array to be used in another javascript file

3 Answers 3

Comments

Array.js

Main.js

3 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Array.js

Main.js

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related