从中介模式javascript中的另一个类访问/调用类方法

Question

class Customer {
    constructor(name) {
        this.name = name;
    }
    send(amount, to) {
        new GooglePay().send(amount, this, to);
    }
    receive(amount, from) {
        console.log(`Payment of ${amount} from ${from} to ${this.name} is succesful`);
    }
}

the problem is based on mediator pattern. so above i have defined my customer who can send and receive money. So I have built a class called GooglePay which mediates transaction between customers. Customer have send function through which they can send money, it takes 2 arguments (amount ,to)

The function should actually then invoke or be received by the GooglePay instance which then sends the amount to the receiver after checking if the receiver has registered

class GooglePay {
    constructor() {
        this.customerBase = [];
    }
    register(name) {
        this.customerBase.push(name);
        return this;
    }
    send(amount, from, to) {
        if (this.customerBase.filter(cust => cust === to)) {
            to.receive(amount, from);
        } else {
            console.log('This customer does not exist');
        }
    }
}

Kindly help me out, I'm stuck and I dont understand how i can access methods of other classes from a class.

Answer 1

So i have found the correct solution for my problem, check it out:

class Customer {
    constructor(name) {
        this.name = name;
        this.googlepay = null;
    }
    send_money(amount, to) {
        this.googlepay.transaction(amount, this, to);
    }
    receive_money(amount, from) {
        console.log(`payment of ${amount} from ${from} to ${this.name} is succesful`);
    }
}

class GooglePay {
    constructor() {
        this.customer_base = [];
    }
    register_customer(customer_class) {
        this.customer_base.push(customer_class);
        customer_class.googlepay = this;
    }
    transaction(amount, from, to) {
        this.customer_base.filter(cust => {
            if (cust.name === to) {
                cust.receive_money(amount, from.name);
            }
        });
    }
}

on close observation you can see a property in my customer class constructor called this.googlepay = null

That's where the trick lies. Cheerios mate Great solving the puzzle.

Answer 2

Doesn't matter if you're using any frameworks, if you want to call a js class (since ECMAScript 2015 (6th Edition, ECMA-262) ). To call functions or properties from a class, you can go like:

//expecting that the class is in another file but same directory
const Gpay = require('./googlePay'); //<-- don't need the .js file extension
const googlePay = new GPay();

Now you can use the class like this:

googlePay.register('Name');