class Person {
  private state ="normal" //cripple

  run() {
    if (this.state === "normal") {
      console.log("run")
    } else {
      console.log("hobble")
    }
  }
}


//vs

abstract class AttemptRun {
  abstract run();
}


class NormalRun extends AttemptRun {
  run() {
    console.log("run")
  }
}

class CrippleRun extends AttemptRun {
  run() {
    console.log("hobble")
  }
}

class Person {
  protected runAbility: AttemptRun;

  run() {
    this.runAbility.run()
  }
}