- 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.
- React Native – Structuring a Real App
The folder layout that survives a second developer. Feature-first rather than type-first, why route files should name a screen and never implement one, path aliases so nothing imports `../../../`, a single shared type contract with the backend, and the rule that keeps it honest: anything two features need moves down, never sideways.
- TypeScript – any, unknown, never and void
The four types that are not values. any switches the checker off and spreads; unknown is the safe version and forces you to prove what you have; never is what a function that does not return has, and the trick behind exhaustive switches; void is not undefined. With the catch (err: unknown) block that made the case.
- NestJS – Modules
The unit Nest is organised around. What imports, providers, controllers and exports each mean, why a provider is private to its module until you export it, when @Global() is right and why it is used exactly once in this app, and how forRoot/forFeature dynamic modules differ from ordinary ones.
- Array Parallel Sort
Arrays.parallelSort sorts an array using every core on the machine instead of one. It is a single-word change from Arrays.sort , which makes it tempting to use everywhere — and it is slower than the sequential version on most of the arrays you will actually sort. Using it Like Arrays.sort , it…