Dependency injection (DI) hija pattern fejn oġġett jirċievi d-dipendenti tiegħu minn barra (injected) minflok li jibda jil-ħamrija nfisu. Tipprumwovi loose coupling, testability, u flessibilità — pattern fundamentali u vastament użat fil-software modern.
X'inhu dependency injection
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WITHOUT DI → a class CREATES its own dependencies (tightly coupled):
class OrderService { constructor() { this.db = new Database(); } } // hardcoded dependency
WITH DI → dependencies are PROVIDED (injected) from outside:
class OrderService { constructor(db) { this.db = db; } } // db is injected
→ the object doesn't create/control its dependencies → they're given to it