Objects

• Dot notation (opens in a new tab)
• Bracket notation (opens in a new tab)
• Setting object members (opens in a new tab) In JavaScript, an object is a collection of properties and methods that are grouped together to represent a single entity. Objects can be thought of as a key-value store, where each key represents a property and each value represents its corresponding value. Here's an example of an object in JavaScript:

let person = {
  name: 'John Doe',
  age: 30,
  job: 'Developer',
  speak: function () {
    console.log('Hello, my name is ' + this.name);
  },
};

In the example above, person is an object with four properties: name, age, job, and speak. The speak property is a function, which is also known as a method. To access the properties of an object, you can use dot notation:

console.log(person.name); // "John Doe"
console.log(person.age); // 30

You can also access the properties of an object using bracket notation, which allows you to access properties using a string expression:

console.log(person['name']); // "John Doe"
console.log(person['age']); // 30

In addition to properties, objects can also have methods, which are functions that are associated with an object. To call a method, you can use dot notation followed by parentheses:

person.speak(); // "Hello, my name is John Doe"

Objects are a fundamental concept in JavaScript and are used to represent real-world objects, such as a person, an event, or a car. Understanding how to create and manipulate objects is essential for any JavaScript programmer.