Default method on a class

Question

There is a way in JS to execute a default method when I call a instance?

Example: Let's assume I have the following class named MyClass, then I start a instance of this class named foo, I want that when I call foo execute the default method of MyClass.

class MyClass {
  constructor () {
    this.props = {
        question: 'live, universe, everything',
        answer: 42
    }
  }

  default () {
    return this.props
  }

  hello () {
    return 'hello world'
  }
}
const foo = new MyClass()

// execute the default method
console.log(foo) // log: {question: 'live, universe, everything', answer: 42}

// execute hello method
console.log(foo.hello()) // log: hello world

Answer 1

The only default method that is called when instantiating an object is the constructor.

In ES6 you can return whatever you want from the constructor so the following code is valid:

    class MyClass {
        constructor () {
              var instance = {
                    question: 'live, universe, everything',
                    answer: 42,
                    hello: () => {  return 'hello world' }
              }
              return instance;
        }
     }

You can then instantiate an object like this:

var foo = new MyClass();
foo.hello(); //Hello world
console.log(foo.question);    //live, universe, everything
console.log(foo.answer);    //42