Initiate a value for a exported variable using exported function Node js-CodePudding

I am trying to set a value to an exported variable using an exported function

Please find the code below

module.js

let globalVariable;
let initFunction = (value) => {
    console.log('init Function')
    globalVariable = value;
}
module.exports = {
    initFunction,
    globalVariable
}

app.js

let {globalVariable,initFunction} = require('./module');
initFunction('test');
console.log('globalVariable: ' globalVariable);

When I try to run app.js, I am getting undefined for globalVariable. How to properly set value to this variable?

Please help Thanks in advance

CodePudding user response：

You are replacing globalVariable so the one after update by initFunction is no more the one that you exported. Init function assign a new pointer to globalVariable, do no mutate the string pointed by globalVariable.

You can place the values inside a data structure that, like an object.

let globalVariable = {};
let initFunction = (value) => {
    console.log('init Function')
    globalVariable.a = value;
}
module.exports = {
    initFunction,
    globalVariable
}

app.js

let {globalVariable,initFunction} = require('./module');
initFunction('test');
console.log('globalVariable: ' globalVariable.a);

It depends on what you need to achieve but can be helpfull for you to consider globalThis