I am new to javascript. I want a class method to return an array of objects instantiated by the same class. How to do that?

Currently,Basically the following is the general structure my code in question.

class myClass{
   constructor(name,password,emailid,id) {
    this.name = name;
    this.password = password;
    this.emailid = emailid;
    this.id = id;
  }

  asyncMethod = async()=> {
     //method returns array of objects of same class
  }
}

CodePudding user response：

On Class instantiation (constructor init), push the current instance to a class's static Array.
Retrieve all your instances by either using <Instance>.method() or myClass.instances

class myClass {

  static instances = [];

  constructor(name, password, emailid, id) {
    this.name = name;
    this.password = password;
    this.emailid = emailid;
    this.id = id;
    myClass.instances.push(this); // Push instance into static Class's property
  }

  getInstances() {
    return myClass.instances; // Return array of instances of same class
  }
}

const A = new myClass("Cada", "123", "[email protected]", 1);
const B = new myClass("Roko", "234", "[email protected]", 2);
const C = new myClass("John", "345", "[email protected]", 3);

console.log(A.name, B.name, C.name); // "Cada", "Roko", "John"
console.log(A.getInstances());  // [myClass, myClass, myClass]
console.log(myClass.instances); // [myClass, myClass, myClass]

Closely related answer: https://stackoverflow.com/a/61014433/383904

And I could not explain the static keyword better than MDN:

Neither static methods nor static properties can be called on instances of the class. Instead, they're called on the class itself. (*ac: myClass.instances in the above demo)
Static methods are often utility functions, such as functions to create or clone objects, whereas static properties are useful for caches, fixed-configuration, or any other data you don't need to be replicated across instances.

CodePudding user response：

that ?

class myClass {
  constructor(name, password, emailid, id) {
    this.Obj = { name, password, emailid, id };
  }

  asyncMethod = async() => {
    return this.Obj
  }
}