deposit.js

const account = {
  balance: 1000,
  bank: '',
  number: '',
}

const deposit = (account, value) => {
  const newAccount = account
  newAccount.balance = account.balance + value
  return newAccount
}

const newAccount1 = deposit(account, 1000) 
console.log(account, newAccount1) // will print account with balance = 2000 and new account with balance = 2000
const newAccount2 = deposit(account, 1000)
console.log(account, newAccount2) // will print account with balance = 3000 and new account with balance = 3000
const newAccount3 = deposit(account, 1000) // no matter what happens, always will returns an account with balance = 2000
console.log(account, newAccount3) // will print account with balance = 4000 and new account with balance = 4000