Angular Dependency Injection

Master Angular's dependency injection system for building modular, testable applications with proper service architecture.

DI Fundamentals

Angular's DI uses the inject() function (Angular 14+) as the preferred injection mechanism — no constructor parameters needed:

import { Injectable, inject } from '@angular/core';

// Service injectable at root level
@Injectable({
  providedIn: 'root'
})
export class UserService {
  private users: User[] = [];