Arrays and Objects

Objects are like digital filing cabinets where you can store related information together. Instead of numbered slots like arrays, objects use named properties (keys) to organize data.

Real-world analogy:

Think of an object like a person's ID card:

• •
  Name:"John Doe"
• •
  Age:30
• •
  City:"New York"
• •
  Job:"Teacher"

Creating objects:

const person = {
  name: "Alice",
  age: 25,
  isStudent: true,
  city: "Boston"
};

Accessing object properties:

• •
  Dot notation:person.name // "Alice"
• •
  Bracket notation:person["age"] // 25
• •
  Use brackets for special cases:person["first-name"]

Modifying objects:

• •
  Change a value:person.age = 26;
• •
  Add new property:person.email = "alice@email.com";
• •
  Remove property:delete person.isStudent;
• •
  Check if property exists:"name" in person // true

Why objects are powerful:

• •Group related data together logically
• •Access data by meaningful names
• •Model real-world entities
• •Perfect for complex data structures

Example - representing a product:

const product = {
  name: "Laptop",
  price: 999.99,
  inStock: true,
  colors: ["silver", "black"]
};