OOP in JavaScript

Roto.js

class BasicRole {
    constructor(name) {
        if (this.constructor === BasicRole) {
            throw new Error("BasicRoleは抽象クラスのため、インスタンス化できません。");
        }
        this.name = name;
    }

    attack() {
        console.log(`${this.name}は攻撃した`);
    }

    guard() {
        console.log(`${this.name}は身を守っている`);
    }

    run() {
        // 
        console.log(`${this.name}は逃げ出した`);
    }
}

class Fighter extends BasicRole {
    doubleAttack() {
        // 
        console.log(`${this.name}の2回攻撃！`);
        this.attack();
        this.attack();
    }

    guard() {
        console.log(`${this.name}の防御力強化`);
    }
}

class Magician extends BasicRole {
    magic() {
        console.log(`${this.name}は呪文を唱えた！`);
    }
}

class Priest extends BasicRole {
    pray() {
        console.log(`${this.name}は祈りをささげた！`);
    }
}

// バトル処理
function battle(party, command) {
    function special(member) {
        if (member instanceof Fighter) {
            member.doubleAttack();
        } else if (member instanceof Magician) {
            member.magic();
        } else if (member instanceof Priest) {
            member.pray();
        }
    }

    for (let i = 0; i < party.length; i++) {
        switch (command[i]) {
            case 1:
                party[i].attack();
                break;
            case 2:
                party[i].guard();
                break;
            case 3:
                party[i].run();
                break;
            default:
                special(party[i]);
                break;
        }
    }
}

function main() {
    const rhodesia = new Fighter("ローデシア");
    const sumaltria = new Magician("サマルトリア");
    const moonburg = new Priest("ムーンブルグ");

    const party = [rhodesia, sumaltria, moonburg];

    console.log("--- ターン 1 ---");
    battle(party, [4, 4, 4]);

    console.log("\n--- ターン 2 ---");
    battle(party, [2, 1, 3]);
}

main();