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TypeScript Classes and OOP

bookGetters and Setters


              
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class BankAccount {
  private _balance: number;

  constructor(initialBalance: number) {
    this._balance = initialBalance;
  }

  get balance(): number {
    return this._balance;
  }

  set balance(amount: number) {
    if (amount < 0) {
      throw new Error("Balance cannot be negative");
    }
    this._balance = amount;
  }
}

const account = new BankAccount(1000);
console.log(account.balance); // 1000
account.balance = 1500;
console.log(account.balance); // 1500
// account.balance = -500; // This will throw an error
copy

Getters and setters in TypeScript classes let you control how properties are accessed and modified. Instead of exposing a property directly, you can use a getter to retrieve its value and a setter to update it. This approach lets you add logic, such as validation or transformation, whenever a property is read or written. By using getters and setters, you can prevent invalid states, enforce rules, or trigger side effects, all while keeping the property itself private and protected from direct changes. This encapsulation is a key part of object-oriented programming, helping you maintain clean, predictable, and robust code as your applications grow.

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What is the main benefit of using getters and setters in a class?

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Seksjon 1. Kapittel 4

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123456789101112131415161718192021222324

            
class BankAccount {
  private _balance: number;

  constructor(initialBalance: number) {
    this._balance = initialBalance;
  }

  get balance(): number {
    return this._balance;
  }

  set balance(amount: number) {
    if (amount < 0) {
      throw new Error("Balance cannot be negative");
    }
    this._balance = amount;
  }
}

const account = new BankAccount(1000);
console.log(account.balance); // 1000
account.balance = 1500;
console.log(account.balance); // 1500
// account.balance = -500; // This will throw an error
copy

Getters and setters in TypeScript classes let you control how properties are accessed and modified. Instead of exposing a property directly, you can use a getter to retrieve its value and a setter to update it. This approach lets you add logic, such as validation or transformation, whenever a property is read or written. By using getters and setters, you can prevent invalid states, enforce rules, or trigger side effects, all while keeping the property itself private and protected from direct changes. This encapsulation is a key part of object-oriented programming, helping you maintain clean, predictable, and robust code as your applications grow.

question mark

What is the main benefit of using getters and setters in a class?

Select the correct answer

Alt var klart?

Hvordan kan vi forbedre det?

Takk for tilbakemeldingene dine!

Seksjon 1. Kapittel 4
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