Front-End Interview Questions

“The Fundamentals of Front-End Development: Building a Strong Foundation”

Curious about the various ways to create objects in JavaScript?

In my article, I've explained the fundamental ways to create objects in JavaScript, from the classics to the modern ES6 syntax. ??

Object constructor: The simplest way to create an empty object is using the Object constructor. Currently this approach is not recommended.

var object = new Object();        

The Object() is a built-in constructor function so "new" keyword is not required. the above can be written as:

var object = Object();        

Object’s create method: The create method of Object creates a new object by passing the prototype object as a parameter

var object = Object.create(null);        

Object literal syntax: The object literal syntax (or object initializer), is a comma-separated set of name-value pairs wrapped in curly braces.

var object = {
     name: "Dimple",
     age: 25
};        

Object literal property values can be of any data type, including array, function, and nested object.        

Function constructor: Create any function and apply the new operator to create object instances,

function Person(name) {
  this.name = name;
  this.age = 21;
}
var object = new Person("Dimple");        

Function constructor with prototype: This is similar to function constructor but it uses prototype for their properties and methods,

function Person() {}
Person.prototype.name = "Dimple";
var object = new Person();        

ES6 Class syntax: ES6 introduces class feature to create the objects

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

var object = new Person("Dimple");        

Singleton pattern: A Singleton is an object which can only be instantiated one time. Repeated calls to its constructor return the same instance and this way one can ensure that they don’t accidentally create multiple instances.

var object = new (function () {
  this.name = "Dimple";
})();        

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