Objects in JavaScript

• Objects in JavaScript are complex data types used to represent real-world entities;
• Objects consist of key-value pairs, where each key (property) has an associated value;
• Keys (property names) can be strings, and values can be of any valid JavaScript data type;
• Objects can store nested and grouped data for organizing complex information.

Object Creation and Property Naming

• Object literals enclosed in curly braces {} are a common way to create objects in JavaScript;
• Object keys (property names) can be enclosed in quotes (single or double) or left unquoted, with certain naming rules;
• Quoted keys allow for arbitrary strings with spaces and special characters;
• Unquoted keys should start with a letter or specific characters like _, $, or any Unicode character.

const person = {
  "first name": "Silvia",
  lastName: "Wuckert",
  age: 47,
};

Accessing Object Properties

• Two common methods for accessing object properties are dot notation and square brackets;
• Dot notation is used when the property name is known in advance, while square brackets are useful when the name is unknown or stored in a variable;
• Nested properties are accessed using dot notation with a path separated by dots.

const car = {
  make: "Toyota",
  model: "Camry",
  engine: {
    type: "V6",
    horsepower: 300,
  },
};

console.log(car.engine.type); // Output: V6

Object Methods

• Object methods are functions defined within objects, allowing data and related functionality to be coupled;
• The this keyword refers to the object calling the method, enabling access to its properties;
• Object methods offer logical organization, data encapsulation, and improved code readability;
• Methods can access object properties using the this keyword and interact with them using dot notation.

const calculator = {
  operand1: 5,
  operand2: 3,
  summarize() {
    return this.operand1 + this.operand2;
  },
};

console.log(calculator.summarize()); // Output: 8