simplify

Author: kentcdodds

exercises/03.inheritance/01.problem.extends/README.mdx

@@ -11,9 +11,5 @@ it with specific shapes like `Circle` and `Rectangle`.
 4. Create a `Rectangle` class that extends `Shape`
 5. Add `width` and `height` fields to `Rectangle`
 
-💰 Use `extends` to inherit fields and methods from a base class.
-
-💰 Don't forget to call `super()` in the constructor if the parent has a
-constructor.
 
 📜 [TypeScript Handbook - Inheritance](https://www.typescriptlang.org/docs/handbook/2/classes.html#inheritance)

exercises/03.inheritance/02.problem.method-overriding/README.mdx

@@ -10,8 +10,5 @@ method to provide its own implementation.
 3. Override `getArea()` in `Rectangle` to return width × height
 4. Optionally use `super` to call the parent method
 
-💰 Override a method by redefining it in the subclass.
-
-💰 You can call `super.method()` to use the parent's implementation if needed.
 
 📜 [TypeScript Handbook - Overriding Methods](https://www.typescriptlang.org/docs/handbook/2/classes.html#overriding-methods)

exercises/04.polymorphism/01.problem.substitutability/README.mdx

@@ -11,6 +11,5 @@ We'll use polymorphism to handle all media types uniformly.
 4. Create a `MediaPlayer` class with a method that accepts `MediaFile`
 5. Demonstrate that both `AudioFile` and `VideoFile` can be used interchangeably
 
-💰 Accept the base class type so any subclass can be used.
 
 📜 [TypeScript Handbook - Classes](https://www.typescriptlang.org/docs/handbook/2/classes.html)

exercises/05.composition-vs-inheritance/01.problem.when-to-use/README.mdx

@@ -11,18 +11,6 @@ inheritance or composition for different scenarios.
 4. Create a `ConsoleLogger` class that uses inheritance (is-a Logger)
 5. Demonstrate when each approach is appropriate
 
-💰 Inheritance (is-a):
-
-- `FileLogger` IS-A `Logger`
-- `ConsoleLogger` IS-A `Logger`
-- They are specializations of Logger
-
-💰 Composition (has-a):
-
-- `EmailService` HAS-A `Logger`
-- EmailService uses logging but isn't a type of logger
-- Can swap different loggers at runtime
-
 💰 Think about the relationship: Is it "is-a" or "has-a"?
 
 📜 [Composition over Inheritance](https://en.wikipedia.org/wiki/Composition_over_inheritance)