11 · Flutter / Dart
Riverpod: observe and change state
Connect an interface to an explicit state owner.
54 Tutorials · DE / EN
Tutorials · Intermediate
Start with no prior knowledge. Small examples explain the language. Medium guides connect building blocks. Large tutorials walk through complete project workflows.
Flutter / Dart
Medium
12 · Flutter / Dart
Clean MVVM, services and repositories
Separate presentation, domain rules and persistence through replaceable contracts.
13 · Flutter / Dart
Understand SQL and place Drift/SQLite in context
Create tables, link records and understand transactions and migrations.
14 · Flutter / Dart
Coordinate photos, files and PDF output
Create a PDF and distinguish file storage, database references and deliberate export.
15 · Flutter / Dart
Unit and widget tests with meaningful expectations
Verify domain rules and visible behaviour rather than only code existence.
React / TypeScript
Medium
11 · React / TypeScript
Forms, lists and effects
Validate forms and deliberately synchronise with an external browser function.
12 · React / TypeScript
React Native, Expo and navigation
Apply React foundations to mobile views and understand native boundaries.
13 · React / TypeScript
SQLite and repositories in House Log
Understand local SQL persistence, transactions and separate device adapters.
14 · React / TypeScript
HTTP contracts and runtime validation
Distinguish transport failures, HTTP failures and invalid response data.
15 · React / TypeScript
Test components and repositories meaningfully
Verify a user action and identify failures only real database tests can find.
Java
Medium
11 · Java
Read CSV and fill PDF forms
Read structured CSV fields and set an AcroForm value using PDFBox.
12 · Java
JDBC, SQLite and local transactions
Store a record through JDBC and understand a migration’s responsibility.
13 · Java
Spring Boot REST with validation
Receive JSON, validate input and return an appropriate HTTP status.
14 · Java
Understand PostgreSQL, JPA and Flyway
Distinguish database schema, object mapping and transaction boundaries.
15 · Java
JUnit, semantic PDF tests and Testcontainers
Verify the contents of a real PDF and choose tests according to the guarantee being demonstrated.