I have app.js
var List = {};
var Entity = require('./entity.js');
var main = new Entity(); // should be changed List
console.log(List) // still empty
and entity.js
class Entity {
constructor(){
this.id = Math.random();
List[this.id] = this; // List == undefined
}
}
module.exports = Entity;
How can I use List as global variable?
Just import List in entity.js:
At the end of app.js:
module.exports = List;
At the start of entity.js:
const List = require('./app.js');
If your app.js needs to export something else as well, then export an object with a List property instead:
At the end of app.js:
module.exports.List = List;
At the start of entity.js:
const List = require('./app.js').List;
You could also consider putting List into its own module that both app.js and entity.js import.
Don't make List a global variable, if at all possible - work with the module system instead, explicit dependencies without global pollution is one of a module system's big advantages.
You need to pass List param and access in constructor ...
new Entity(List);
constructor(List){
...
