Скачать или смотреть 19 OOP - Encapsulation - Access Modifiers in TypeScript

🔐 TypeScript Essentials #19 Encapsulation & Access Modifiers: Control Your Code

In this episode, we explore how encapsulation works in TypeScript through the use of access modifiers—giving you full control over what’s exposed, what’s hidden, and how your classes behave. Whether you're designing secure components or scalable automation objects, mastering encapsulation is key to writing maintainable, bug-resistant code.

🎯 What You’ll Learn:
🧱 What Is Encapsulation?
→ The practice of hiding internal class details and exposing only what’s necessary
→ Promotes modularity, security, and clean architecture
🔧 Access Modifiers in TypeScript
public: Accessible from anywhere (default)
private: Accessible only within the class
protected: Accessible within the class and its subclasses
readonly: Prevents reassignment after initialization
🧠 Practical Examples
class Account {
public owner: string;
private balance: number;
protected currency: string;
constructor(owner: string, balance: number, currency: string) {
this.owner = owner;
this.balance = balance;
this.currency = currency;
}
public getBalance(): number {
return this.balance;
}
}

class PremiumAccount extends Account {
public getCurrency(): string {
return this.currency; // ✅ Accessible via protected
}
}

🛡️ Why Encapsulation Matters
→ Prevents accidental data manipulation
→ Encourages clear interfaces and safe APIs
→ Makes debugging and refactoring easier

🧪 Real-World Use Cases
Hiding sensitive data like passwords or tokens
Protecting internal logic in automation frameworks
Structuring reusable components with clear boundaries
Enforcing business rules through controlled access

⚠️ Best Practices
→ Use private for internal state, protected for extensibility
→ Expose data via getter/setter methods when needed
→ Avoid exposing unnecessary implementation details

#typescript #Encapsulation #AccessModifiers #OOP #TSBasics #FrontendDev #AutomationTesting #SDET #PlaywrightQA #TypeScriptTutorial #QAEngineering