SOLID - Interface Segregation Principle

isp_ex1.ts

// Bad Interface
interface Bird {
  fly(): void;
  walk(): void;
}
class Penguin implements Bird {
  public fly() {
    throw new Error('Unfortunately, Penguin can not fly!');
  }
  public walk() {
    /// ...
  }
}
class Hawk implements Bird {
  public fly() {
    /// ...
  }
  public walk() {
    /// ...
  }
}

isp_ex2.ts

// Good Interface
interface CanWalk {
  walk(): void;
}
interface CanFly {
  fly(): void;
}
class Penguin implements CanWalk {
  public walk() {
    /// ...
  }
}
class Hawk implements CanFly, CanWalk {
  public fly() {
    /// ...
  }
  public walk() {
    /// ...
  }
}