- Spring Boot – Mapping DTOs with MapStruct
Generated mapping code instead of hand-written getters and setters, checked at compile time. Writing a mapper, handling nested objects and custom expressions — and the annotation-processor ordering that makes MapStruct and Lombok work together, because getting it wrong produces mappers that compile and map nothing.
- iOS – Getting Started
What you actually need to build an iOS app, what each piece of Xcode is for, and the anatomy of a project — targets, schemes, build configurations and the .xcodeproj nobody can read. Ending with a project generated from a manifest instead, so a build setting change is a line in a diff rather than an opaque edit.
- Python – Tuples
Tuples and why an immutable sequence earns its place next to the list. Unpacking, returning more than one value, the starred target, named tuples, and the one-element tuple that catches everybody.
- CompletableFuture
CompletableFuture runs work on another thread and lets you describe what should happen when it finishes — without blocking to wait for it. It is how you stop making a caller wait for three slow things in sequence when they could happen at once. Starting work supplyAsync when you want a value back,…
- Terraform – HCL Syntax You Will Actually Use
HCL is small, and this is the part of it you need. Blocks and arguments, the type system, string interpolation and heredocs, the functions worth memorising, `terraform console` for trying an expression without an apply, and `terraform fmt` so nobody reviews your indentation.