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Exercise 3

Create a BankAccount class with a private field balance. Add a private method, #checkBalance, that logs the current balance. Provide a public method, deposit, to add money to the account and withdraw to take money out. Raise a RangeError if there are insufficient funds for the withdrawal.

class BankAccount {
  // your code here
}

let account = new BankAccount();
account.deposit(100);
account.withdraw(50);
account.withdraw(100); // RangeError: Insufficient funds

Solution

class BankAccount {
  //highlight
  #balance = 0;

  #checkBalance() {
    console.log(`Current balance: $${this.#balance}`);
  }

  deposit(amount) {
    this.#balance += amount;
    this.#checkBalance();
  }

  withdraw(amount) {
    if (amount > this.#balance) {
      throw new RangeError('Insufficient funds');
    } else {
      this.#balance -= amount;
      this.#checkBalance();
    }
  }
  //endhighlight
}

let account = new BankAccount();
account.deposit(100);  // Current balance: $100
account.withdraw(50);  // Current balance: $50
account.withdraw(100); // Insufficient funds

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