Liskov Substitution Principle

Bird.js

// bad
class Bird{
  fly(){
    console.log('I can fly')
  }
}
class Duck extends Bird {
  constructor(){
    super();
  
  } 
  fly(){
  }
}

// Ostrich breaks the Liskov Substitution principle as it can not be replaced for the base class
class Ostrich extends Bird {
  constructor(){
    super();
  
  } 
  fly(){
  }
}


// good
class Bird{}

class FlyingBird extends Bird {
  fly(){
  }
}

class LandBird extends Bird {
}

class Duck extends FlyingBird {
  constructor(){
    super();
  
  } 
  fly(){
  }
}