When and how to declare objects?

Question

JavaScript

1. Object constructor

var person = new Object();

person.name = "Anand",
person.getName = function(){
  return this.name ; 
};

2.literal constructor

var person = { 
  name : "Anand",
  getName : function (){
   return this.name
  } 
}

3. function constructor

function Person(name){
  this.name = name
  this.getName = function(){
    return this.name
  } 
}

4. Prototype

function Person(){};

Person.prototype.name = "Anand";

5.Function/Prototype combination

function Person(name){
  this.name = name;
} 
Person.prototype.getName = function(){
  return this.name
}

6.Singleton

var person = new function(){
  this.name = "Anand"
}

When, how, why?

Answer 1

Vote for unspecified option #7: use classes (one per module) and never shaman anything on prototypes by hand. This will allow you to keep an understanding of what is happening in the code in general for a longer time.

export default class Person {
    constructor(name) {
        this.name = name;
    }

    getName() {
        return `My name is ${this.name}`;
    }
}

// Если нужен singleton, немного меняем экспорт:
//
// const PERSON = new Person();
// export default PERSON;