what is JavaScript Reserved Words guide with code example

 

JavaScript objects are a key concept in the language and allow for the creation of complex data structures that can store and manipulate data. In this guide, we will cover the basics of JavaScript objects, including object literals, object properties, methods, inheritance, and more. We will also provide code examples for each concept to help you better understand how they work.

Object Literals

Object literals are a way of creating an object in JavaScript using curly braces {}. They allow you to define key-value pairs within the object. Here's an example:

javascript
let person = {
  name: "John",
  age: 30,
  hobbies: ["reading", "coding", "gaming"],
  address: {
    street: "123 Main St",
    city: "New York",
    state: "NY",
    zip: "10001",
  },
};

In this example, we create an object called person that has several key-value pairs, including a name, age, hobbies array, and an address object.

Object Properties

Object properties are the values associated with the keys in an object. You can access them using dot notation or bracket notation. Here's an example:

javascript
console.log(person.name); // Output: "John"
console.log(person.hobbies[0]); // Output: "reading"
console.log(person.address.city); // Output: "New York"

In this example, we access the name property using dot notation, the hobbies property using bracket notation and the city property of the address object using dot notation.

Object Methods

Object methods are functions that are associated with an object. They can be called using dot notation and can modify the object's properties. Here's an example:

javascript
let person = {
  name: "John",
  age: 30,
  greet: function () {
    console.log(`Hello, my name is ${this.name}`);
  },
};

person.greet(); // Output: "Hello, my name is John"

In this example, we create an JavaScript object called person that has a greet method that logs a message to the console using the name property of the object.

Inheritance

Inheritance is a way of creating new objects that inherit properties and methods from a parent object. In JavaScript, inheritance is achieved using prototype chaining. Here's an example:

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

Person.prototype.greet = function () {
  console.log(`Hello, my name is ${this.name}`);
};

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

Student.prototype = Object.create(Person.prototype);
Student.prototype.constructor = Student;

Student.prototype.greet = function () {
  console.log(`Hello, my name is ${this.name} and I'm a student`);
};

let john = new Person("John", 30);
let jane = new Student("Jane", 20, "Computer Science");

john.greet(); // Output: "Hello, my name is John"
jane.greet(); // Output: "Hello, my name is Jane and I'm a student"

In this example, we define a Person constructor function that creates objects with a name and age property and a greet method. We then define a Student constructor function that creates objects with a major property and inherits the name, age, and greet properties and methods from the Person constructor function using prototype chaining.

Complex Problem Solving

JavaScript objects can be used to solve complex problems. For example, you can use