examples.js

let balance = 100;

function deposit(amount) {
  balance += amount;
}

function withdraw(amount) {
  balance -= amount;
}

withdraw(1000);
console.log(balance);

// Objetos Literales
const account = {
  owner: 'Felipe',
  ownerId: 12312,
  balance: 100,

  deposit(amount) {
    if (amount <= 0) throw new Error('El monto debe de ser mayor a 0');
    this.balance += amount;
    return this.balance;
  },

  withdraw(amount) {
    if (amount <= 0) throw new Error('El monto debe ser mayor a 0');
    if (amount > this.balance) throw new Error('Fondos Insuficientes');
    this.balance -= amount;
    return this.balance;
  },
};

console.log(account.balance); // 100
account.deposit(50); // 150
account.withdraw(70); // 80
console.log(account.balance); //80