Getters and Setters

Can reading a property run code? In a class, it can. The expression account.available below looks like a plain property read, but no property with that name is stored anywhere on the object.

class BankAccount {
  private balance: number;
  private overdraftLimit = 200;

  constructor(balance: number) {
    this.balance = balance;
  }

  get available(): number {
    return this.balance + this.overdraftLimit;
  }

  deposit(amount: number): void {
    this.balance += amount;
  }
}

const account = new BankAccount(100);
console.log(account.available); // 300

account