Why Overriding methods and properties in Swift? - Purpose & Use Cases

The Big Idea

What if you could change just one part of your code and instantly create a whole new behavior without rewriting everything?

The Scenario

Imagine you have a basic car model in your code, and you want to create a sports car that behaves a little differently. Without overriding, you'd have to rewrite the entire car code for the sports car, even if most parts are the same.

The Problem

Manually copying and changing code for each new car type is slow and confusing. It's easy to make mistakes, and if you fix a bug in the basic car, you have to fix it again in every copy. This wastes time and causes errors.

The Solution

Overriding lets you keep the basic car code and only change the parts that need to be different in the sports car. This means less code, fewer mistakes, and easier updates.

Before vs After

✗ Before

class Car {
  func drive() {
    print("Driving normally")
  }
}

class SportsCar {
  func drive() {
    print("Driving fast")
  }
}

✓ After

class Car {
  func drive() {
    print("Driving normally")
  }
}

class SportsCar: Car {
  override func drive() {
    print("Driving fast")
  }
}

What It Enables

It enables you to build flexible, reusable code that adapts easily to new needs without rewriting everything.

Real Life Example

Think of a video game where different characters share common moves but have special attacks. Overriding lets each character keep the common moves and customize their special attacks easily.

Key Takeaways

Overriding saves time by reusing code.

It reduces errors by changing only what's needed.

It makes your code easier to update and extend.