Creating Objects

JavaScript has a similar object constructor to object-oriented languages, and you can create a new instance of a JS object with the new keyword:

let obj = new Object();

JavaScript object programming commonly simplifies object creation by using the object literal syntax:

let literalObj = {};

JS Objects are composed of key-value pairs, similar to a Java HashMap.
A newly created instance of HashMap does not have any keys or values, it is an empty collection. This is roughly equivalent to a newly defined JavaScript object literal ({}).

// Java
public static void main(String[] args) {
  Map<String, String> dog = new HashMap<>();
}

// JavaScript
let dog = {};