Why Classes and objects in Flutter? - Purpose & Use Cases

The Big Idea

What if you could create many users in your app with just one simple blueprint?

The Scenario

Imagine you want to create a mobile app that shows many different users, each with their own name, age, and profile picture. Without classes and objects, you would have to write separate code for each user manually.

The Problem

This manual way is slow and confusing. If you want to change how a user looks or add a new detail, you must update every single user separately. It's easy to make mistakes and hard to keep track of all the data.

The Solution

Classes and objects let you create a blueprint for a user once. Then you can make many user objects from that blueprint, each with its own details. This keeps your code clean, organized, and easy to update.

Before vs After

✗ Before

var user1Name = 'Alice';
var user1Age = 25;
var user2Name = 'Bob';
var user2Age = 30;

✓ After

class User {
  String name;
  int age;
  User(this.name, this.age);
}

var user1 = User('Alice', 25);
var user2 = User('Bob', 30);

What It Enables

With classes and objects, you can easily create, manage, and update many similar items in your app without repeating code.

Real Life Example

Think of a contact list app: each contact is an object created from a Contact class, making it simple to add, edit, or display contacts consistently.

Key Takeaways

Classes are blueprints for creating objects with shared properties.

Objects are individual instances created from classes.

This approach saves time and reduces errors in your app code.