Objects & JSON

Example demonstrating object creation, manipulation, and JSON usage:

// Create a JavaScript object
const user = {
  name: "Alice",
  age: 25,
  isAdmin: true,
  greet: function() {
    return `Hello, my name is ${this.name}`;
  }
};

// Accessing properties and calling methods
console.log(user.name);       // "Alice"
console.log(user.greet());    // "Hello, my name is Alice"

// Convert object to JSON
const jsonString = JSON.stringify(user);
console.log(jsonString);

// Convert JSON back to object
const parsedUser = JSON.parse(jsonString);
console.log(parsedUser.name); // "Alice"
          

This code demonstrates:

• Creating and accessing object properties.
• Using methods within objects.
• Serializing objects to JSON using JSON.stringify().
• Parsing JSON strings to objects with JSON.parse().

JavaScript Objects: Collections of key-value pairs, where keys are strings and values can be any data type. Objects are used to represent real-world entities in code.

JSON: A data format derived from JavaScript object syntax, used for storing and exchanging data between servers and web applications.

Key Object Features:

• Object.keys(obj) - Returns an array of object keys.
• Object.values(obj) - Returns an array of values.
• Object.entries(obj) - Returns an array of key-value pairs.
• Methods can be defined directly within objects.
• JSON.stringify(obj) - Converts an object to a JSON string.
• JSON.parse(jsonStr) - Converts a JSON string to an object.

• Modeling real-world data such as users, products, or settings.
• Communicating with APIs using JSON payloads.
• Storing configuration or state in structured form.
• Representing structured data in client-side applications.
• Data serialization and persistence in local storage or databases.