Apa iku Repository pattern?

Question

Accepted Answer

**Repository** pattern abstrak **data access** ing ngarep interface sing ilang-ilang — misahing business logic saka cara data disimpen lan dijupuk. Iku mecahaken aplikasi saka data sources (databases, APIs), nambah testability lan maintainability.

## Apa sing Repository pattern gawe

```text
REPOSITORY → an abstraction layer between business logic and DATA ACCESS:
  → provides a clean interface (like a collection: findById, save, delete, findAll)
  → HIDES how/where data is actually stored (database, API, cache, files)
  → business logic uses the repository, NOT the database directly
→ separate WHAT data operations from HOW they're implemented
```

## Conto

```js
// repository interface — business logic depends on THIS, not the DB
class UserRepository {
  async findById(id) { /* query the database (hidden behind here) */ }
  async save(user) { /* insert/update */ }
  async findByEmail(email) { /* ... */ }
}
// business logic uses the repository, unaware of the data source
const user = await userRepository.findById(42);
// → swap the DB, or use a mock in tests, without changing business logic
```

## Manfaat

```text
✓ DECOUPLING → business logic doesn't depend on data-access details (DB, ORM, API) →
  swap data sources without changing business logic
✓ TESTABILITY → use a MOCK/fake repository in tests (no real database needed)
✓ CENTRALIZED data access → query logic in one place (maintainable, consistent)
✓ CLEANER architecture → clear separation between domain/business logic and data
→ common in layered/clean architectures; works with DI
```

## Apa Pentinge

Pamahaman Repository pattern iku berharga amarga iku **pattern sing umum lan praktis** kanggo misahing business logic saka data access kanthi bersih, mula relevan kanggo ilmu desain.

Repository pattern abstrak data access ing ngarep interface sing ilang-ilang (findById, save, delete), **ndhelikake carane lan mangene data disimpen** supaya business logic nggunakake repository tinimbang database langsung.

Pamahaman apa sing ditindakake (nyediakake interface data-access sing bersih sing ndhelikake storage aktual, misahing *apa* operasi data saka *carane* dieksekusi) iku ilmu inti.

Pamahaman **manfaat** iku penting: **decoupling** (business logic ora netepi detail data-access kayata database spesifik, ORM, utawa API, mula sampeyan bisa nggatekke data sources tanpa ngganti business logic — manfaat arsitektur sing berharga), **testability** (nggunakake mock/fake repositories ing test supaya database nyata ora dibutuhake — penting kanggo unit testing business logic), **centralized data access** (query logic ing siji papan kanggo maintainability lan konsistensi), lan **cleaner architecture** (pemisahan cetha antarane domain/business logic lan data).

Manfaat-manfaat iki nggawe Repository pattern praktis berharga kanggo aplikasi sing maintainable lan testable.

Pamahaman yen iku umum ing **layered/clean architectures** lan bisa digunakake karo dependency injection njelas posisine ing arsitektur modern.

Repository pattern digunakake kanthi luas amarga misahing business logic saka data access (kanggo testability, maintainability, lan flexibility) iku kebutuhan umum lan penting.

Amarga Repository pattern iku pattern umum lan praktis kanggo misahing business logic saka data access kanthi bersih (decoupling, testability, centralized data access, cleaner architecture) — kebutuhan umum lan penting — lan sentral kanggo layered/clean architectures, lan amarga pamahaman apa sing ditindakake lan manfaate relevan kanggo nggawe aplikasi sing maintainable, pamahaman Repository pattern iku berharga, ilmu desain sing relevan praktis — pattern sing arang-arang digunakake kanggo misahing business logic saka data access, nyediakake decoupling lan testability, sentral kanggo clean/layered architectures, lan ilmu desain penting kanggo nggawe aplikasi yang maintainable lan testable kanthi pemisahan bersih antarane logic lan data.