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News
The QA Learning Curve #8: Primitive vs Non-Primitive Data Types
2+ hour, 1+ min ago (236+ words) Every value in JavaScript falls into one of two buckets: primitive or non-primitive. It sounds like a small technical detail, but it shapes how variables, functions, and objects actually behave once your code starts running These are the basic, single…...
Can Compile-Time Generated Validation Really Be Faster?
2+ hour, 1+ min ago (978+ words) I Benchmarked Valix Against Hibernate Validator Benchmarked my Valix against Hibernate Validator across Kotlin, Android, Ktor, Spring …...
10 Essential Programming Concepts Every Beginner Needs to Know
8+ hour ago (1001+ words) Learning how to program can feel overwhelming at first. You open your code editor, see lines of strange symbols and keywords, and suddenly wonder, “Where do I even start?” The good news is that you don’t need to understand everything…...
Java Generics Deep Dive: Wildcards, Bounded Types, and Type Erasure
9+ hour, 26+ min ago (835+ words) This article fixes that. We’ll build the model from first principles: why generics exist, how type parameters and bounds work, the PECS rule for wildcards, and the single most important thing about Java generics — they don’t exist at runtime. Once…...
The Other Half of Your Java Enum Has Been Sitting There Since Java 17
9+ hour, 31+ min ago (35+ words) Part 2 of 2: finishing the sentence enum started in 2004, with sealed interfaces, records, pattern matching, and a trick almost …...
Mixins: Reusing Behavior Without Building Deep Inheritance Hierarchies
9+ hour, 47+ min ago (559+ words) Sometimes an object needs a capability, not a parent. A mixin allows us to add reusable behavior to a class without forcing that class into a traditional inheritance hierarchy. We could create a common parent: But now we are introducing…...
xUnit 4 ParallelMode.All: Protect Shared State from Test Races
15+ hour, 9+ min ago (588+ words) xUnit 4.0.0 makes full test-case parallelization an explicit option. That is useful, but xUnit 4 ParallelMode.All changes a quiet assumption in many suites: tests in the same class, including separate rows of one theory, may now overlap. A static fake, shared…...
Architecting a Low-Power Geofencing Engine: Lessons from Battery Optimization on Android
18+ hour, 18+ min ago (1636+ words) Opening hook The silence in the room was absolute, save for the rhythmic scratching of pens against paper during a final exam. I was three rows back, feeling confident, until my phone decided to vibrate against the wooden desk. It…...
One Missing Index Annotation Turned My Spring Boot App Into an N+1 Query Nightmare
14+ hour, 13+ min ago (51+ words) Our Spring Boot order history endpoint was blazing fast in staging but took 4.8 seconds in production. The culprit was a hidden Hibernate N+1 query problem caused by lazy loading. Learn how a single @EntityGraph annotation reduced 341 database queries to 1 and…...
Android + NVIDIA Jetson + ROS 2: Building an AI Robot
19+ hour, 11+ min ago (255+ words) A practical Physical AI system often separates the user interface, AI compute, robotics middleware, and hardware control. In this architecture, Android provides the operator interface, an NVIDIA Jetson provides edge AI compute, and ROS 2 coordinates robotics workloads. This separation makes…...