const assert = require('assert');


class BankCustomer {
    constructor (name, pin) {
        let secretName = name;
        let secretPin = pin;

        this.getName = () => secretName;
        this.verifyPinInput = (code) => code == secretPin;
    }

}


// Tests

const customer = new BankCustomer('John Doe', '3579');

assert.equal(typeof customer.getName, 'function');
assert.equal(typeof customer.verifyPinInput, 'function');
assert.equal(customer.getName(), 'John Doe');
assert.ok(customer.verifyPinInput('3579'));
assert.equal(typeof customer.secretName, 'undefined');
assert.equal(typeof customer.secretPin, 'undefined');

console.log(customer.secretName);