为 MERN 处理 Javscript OOP 项目：Class 和构造函数

Question

I am learning about classes and constructors for MERN, and I am stuck on an algorithm.

Basically, this is what I have to do: create a Ninja class add attribute: name add attribute: health add attribute speed; give a default of 3; add attribute strength;. default of 3 add method sayName(); should log ninja's name add method showStats(); should console log all stats (name, strength, speed and health) add method drinkSake(); should increase health by +10

This is my code so far:

class Ninja {
    constructor(name,health){
        this.speed = 3;
        this.strength = 3;
    }
    sayName() {
        this.name = "Lemon";
    }
    showStats(){
        this.name = name;
        this.health = health;
        this.speed = speed;
        this.strength = strength;
        console.log(showStats);
    }
    drinkSake(){
        this.health += 10;
    }
    
}

and then my constructor is listed at the bottom outside of the functions (I tried to play it inside and I also received an error

const ninja = new Ninja ("lemon", 100){
    Ninja.sayName();
    console.log(ninja.name);
}

I am having a problem figuring out where the new instances goes. If you could keep the advice as basic as possible I would much appreciate it.

Answer 1

This is a the way you should implement the ninja class.

    // classes get defined at the top of the file since they aren't hoisted.
    class Ninja {
        // This is where you define your constructor method.
        constructor(name,health,speed,strengh){
            this.name = name;
            this.health = health;
            this.speed = speed;
            this.strength = strength;
        }
        sayName() {
            console.log(`Hello my name is ${this.name}`);
        }

        showStats(){
            console.log(`Name: ${this.name}\nSpeed: ${this.speed}\nStrength: 
              ${this.strength}\nHealth: ${this.health}`);
        }
        drinkSake(){
            this.health += 10;
        }
    }
    // Make instances of the class down yonder below the class
    // This is calling the constructor method.
    const benny = new Ninja("Benny Bob", 100,3,3);
    // You can also call the methods on the class
    benny.showStats();
    // Should output 
    // Name: Benny Bob
    // Speed: 3
    // Strength: 3
    // Health: 100