Classes in TypeScript
Implementing Interfaces in Classes
Enforce contract compliance on classes using the implements clause.
Last Updated: July 29, 2026
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10 min read
The implements clause ensures a class satisfies a defined interface contract.
1. Introduction & Architecture
2. Deep Dive & Core Concepts
A class can implement multiple interfaces separated by commas: class User implements Authenticatable, Serializable.
3. Basic Code Example
4. Advanced Production Patterns
5. Interactive Code Playground
interface Runnable { run(): void; }
class App implements Runnable { run() { console.log("Running"); } }
new App().run();6. Common Pitfalls & Edge Cases
Note:
implements checks class structure but DOES NOT infer parameter types on implemented methods automatically!7. Interview Q&A & Quizzes
Q: Can a TypeScript class implement multiple interfaces?
A: Yes, a class can implement any number of interfaces.
8. Summary Comparison Table
| Clause | Purpose | Quantity |
|---|---|---|
extends | Class inheritance | Exactly 1 |
implements | Interface contract compliance | Unlimited |