open-closed-good-1.ts

abstract class Character {  
    protected _power: number;
    private _name: string;

    constructor(name:string, power: number = 0 ){
        this._name = name;
        this._power = power;
    }

    calculateFightPower(): number {
        return this._power;
    }

    get name(): string {
        return this._name;
    }
}

class Heroe extends Character{
    calculateFightPower() {
        return super.calculateFightPower() * 2;
    }
}
class Villain extends Character {
    calculateFightPower() {
        return super.calculateFightPower() + 100;
    }
}
class Human extends Character{
    calculateFightPower() {
        return super.calculateFightPower() + 10;
    }
}

class CharacterService {  
    characters: Character[] = [
                new Heroe("Mario", 100),
                new Villain("Koopa", 85),
                new Human("Carlos", 30),
    ];

    constructor() {
        const power = this.calculatePowerTeam(this.characters);
        console.log(`The power of the team is ${power}`);
    }

    calculatePowerTeam(characters: Character[]){  
        let power = 0;
        for (const character of characters) {
           power += character.calculateFightPower();
        }
        return power;
    }
}
new CharacterService();