Objects 

An object is a non-primitive data type that represents a collection of properties. It is a key-value pair data structure where each key is a string (or symbol) and each value can be any valid JavaScript data type, including another object.

Declaration

1. Object Literals:  An object literal is a comma-separated list of name-value pairs wrapped in curly braces {}.

Example:

const person = {
  name: 'John Doe',
  age: 30,
  address: {
    city: 'New York',
    state: 'NY'
  }
};

2. Constructor Functions:  A constructor function is a function that is used to create new objects.

Example:

function Person(name, age) {
  this.name = name;
  this.age = age;
}

const person1 = new Person('John Doe', 30);
const person2 = new Person('Jane Doe', 25);

3. Object.create() Method: It creates a new object with the specified prototype object and properties.

Example:

const person = {
  name: 'John Doe',
  age: 30
};

const newPerson = Object.create(person);
newPerson.age = 25;
console.log(newPerson.name); // Output: John Doe
console.log(newPerson.age); // Output: 25

Note : Objects in JavaScript are mutable, which means that their properties can be changed or added at any time. Properties can be accessed using dot notation (e.g. object.property) or bracket notation (e.g. object[‘property’]).Mark as ReadReport An Issue