Strategy

interface WorkoutStrategy {
  fire(): void;
  stop?(): void;
}

class Running implements WorkoutStrategy {
  public fire(): void {
    console.log('Running');
  }
}

class Basketball implements WorkoutStrategy {
  public fire(): void {
    console.log('Basketball');
  }
}

class Swimming implements WorkoutStrategy {
  public fire(): void {
    console.log('Swimming');
  }
}

class Person {
  public strategy: WorkoutStrategy;
  public name: String;
  constructor(name: string, strategy: WorkoutStrategy) {
    this.name = name;
    this.strategy = strategy;
  }

  workout(): void {
    console.log(`${this.name} starts:`);
    this.strategy.fire();
  }
}

(function main() {
  const amanda = new Person('Amanda', new Running());
  amanda.workout();

  const bill = new Person('Bill', new Swimming());
  bill.workout();
})();
copy