Why Class.new for dynamic class creation in Ruby? - Purpose & Use Cases

The Big Idea

What if you could create brand new classes instantly, without typing them all out?

The Scenario

Imagine you need to create many similar classes by hand, each with slight differences, like making dozens of cookie cutters one by one.

The Problem

Writing each class manually is slow and boring. It's easy to make mistakes and hard to change all classes later if you want to update their behavior.

The Solution

Using Class.new lets you create classes on the fly, like a magic cookie cutter maker that builds new shapes instantly with your instructions.

Before vs After

✗ Before

class Dog
  def speak
    'Woof!'
  end
end

class Cat
  def speak
    'Meow!'
  end
end

✓ After

Dog = Class.new do
  def speak
    'Woof!'
  end
end

Cat = Class.new do
  def speak
    'Meow!'
  end
end

What It Enables

You can build flexible programs that create new types of objects whenever you need, without writing repetitive code.

Real Life Example

Imagine a game where new enemy types appear dynamically based on player choices; Class.new helps create those enemy classes on demand.

Key Takeaways

Manually writing many classes is slow and error-prone.

Class.new creates classes dynamically and cleanly.

This makes your code flexible and easier to maintain.