https://lovemesomecoding.com Practical programming tutorials for working developers. en-us Sat, 05 Sep 2026 15:00:00 GMT https://lovemesomecoding.com/typescript/typescript-interview-questions https://lovemesomecoding.com/typescript/typescript-interview-questions Sat, 05 Sep 2026 15:00:00 GMT typescript The questions a TypeScript role actually asks, answered against the twenty lessons before this one. any versus unknown, interface versus type, why enum is contentious, what structural typing means in practice, how narrowing works, what erases at build time and what does not. Short answers, with the reasoning behind them. https://lovemesomecoding.com/nestjs/nestjs-interview-questions https://lovemesomecoding.com/nestjs/nestjs-interview-questions Sat, 05 Sep 2026 15:00:00 GMT nestjs The questions that actually get asked, with answers drawn from the nineteen lessons before this one — module scope and why a provider is not global, guards versus middleware versus interceptors, how Nest resolves a dependency, why the global ValidationPipe matters, and what happens to an exception on its way out. https://lovemesomecoding.com/typescript/typescript-with-react https://lovemesomecoding.com/typescript/typescript-with-react Wed, 02 Sep 2026 15:00:00 GMT typescript Typing props and children, useState where inference is enough and where it is not, useRef's two different types, event handlers, and generic components. Plus the context pattern that removes the `| undefined` every consumer would otherwise have to handle, taken from this app's auth provider. https://lovemesomecoding.com/nestjs/nestjs-testing https://lovemesomecoding.com/nestjs/nestjs-testing Wed, 02 Sep 2026 15:00:00 GMT nestjs Test.createTestingModule, mocking a provider with useValue, and getting the token right — @InjectDataSource does not ask for the class, so overriding the class leaves your test talking to the real database. Then e2e with supertest, and the trap that makes a whole suite pass vacuously: forgetting the global pipe. https://lovemesomecoding.com/typescript/typescript-decorators https://lovemesomecoding.com/typescript/typescript-decorators Sun, 30 Aug 2026 15:00:00 GMT typescript A decorator is a function that runs when the class is defined. What @Injectable, @Column and @Post are really doing, the metadata reflection that lets a framework read your parameter types at runtime, writing your own, and the split between the legacy experimentalDecorators and the standard ones — with which this app uses. https://lovemesomecoding.com/nestjs/nestjs-file-upload https://lovemesomecoding.com/nestjs/nestjs-file-upload Sun, 30 Aug 2026 15:00:00 GMT nestjs FileInterceptor and multer, and the fact that decides everything else about an upload endpoint: the Content-Type is whatever the client typed. Memory storage versus disk and why it is a security choice, stopping a 2 GB request at 5 MB, sniffing magic bytes, and generating the stored filename rather than sanitising one. https://lovemesomecoding.com/typescript/typescript-tsconfig https://lovemesomecoding.com/typescript/typescript-tsconfig Thu, 27 Aug 2026 15:00:00 GMT typescript Most of tsconfig you set once. These are the ones that change what compiles: the strict family one flag at a time, target and lib and how they differ, moduleResolution, noEmit, erasableSyntaxOnly, and path aliases. Read off the two real configs in this app — which disagree with each other, correctly. https://lovemesomecoding.com/nestjs/nestjs-authorization-roles https://lovemesomecoding.com/nestjs/nestjs-authorization-roles Thu, 27 Aug 2026 15:00:00 GMT nestjs Role-based access with @Roles and a RolesGuard, and the harder half nobody shows: ownership. Why the role never comes from a request body, why a foreign resource returns 404 rather than 403, and why the route whose rules depend on the row deliberately has no @Roles decorator at all. https://lovemesomecoding.com/terraform/terraform-interview-questions https://lovemesomecoding.com/terraform/terraform-interview-questions Mon, 24 Aug 2026 15:00:00 GMT terraform The questions Terraform interviews actually ask, answered the way you would say them out loud. What state is for, `count` versus `for_each`, how locking works, module versioning, what happens when someone changes something in the console, Terraform versus CloudFormation versus Ansible, and how you would recover a corrupted state file. https://lovemesomecoding.com/typescript/typescript-modules https://lovemesomecoding.com/typescript/typescript-modules Mon, 24 Aug 2026 15:00:00 GMT typescript import type and why a bundler needs you to say it, verbatimModuleSyntax, and the reason the NestJS half of this app writes `.js` in an import that points at a `.ts` file. Module resolution in one page, declaration files, and what to do about a package that ships no types. https://lovemesomecoding.com/nestjs/nestjs-authentication-jwt https://lovemesomecoding.com/nestjs/nestjs-authentication-jwt Mon, 24 Aug 2026 15:00:00 GMT nestjs Register and login end to end: bcrypt with a cost that is slow on purpose, what goes in a token and what must never, signing with @nestjs/jwt, and the two defences that keep a login form from confirming which addresses are registered — one message for every failure, and a dummy hash comparison so they take the same time. https://lovemesomecoding.com/frontend-dev/frontend-dev-build-and-deployment https://lovemesomecoding.com/frontend-dev/frontend-dev-build-and-deployment Sun, 23 Aug 2026 18:00:00 GMT frontend-dev What happens between your source and the files a browser downloads, and how those files get somewhere real. Bundling, the dev server, environment variables and why they are not secret, static hosting on a CDN, cache headers and content hashing, the SPA fallback that 404s every deep link if you forget it, and a CI pipeline worth having. https://lovemesomecoding.com/frontend-dev/frontend-dev-testing https://lovemesomecoding.com/frontend-dev/frontend-dev-testing Fri, 21 Aug 2026 18:00:00 GMT frontend-dev How you change code you did not write without being afraid. What is worth testing in a UI and what is not, testing what the user sees rather than what the component holds, querying by role so a test breaks when the app breaks and not when a class name changes, and where end-to-end tests earn their keep. https://lovemesomecoding.com/terraform/terraform-production-practices https://lovemesomecoding.com/terraform/terraform-production-practices Fri, 21 Aug 2026 15:00:00 GMT terraform What changes when the state file matters. Reading a plan properly and the three words that should stop a merge, `prevent_destroy` on the things you cannot lose, drift and what to do about it, secrets in SSM instead of variables, `moved` and `import` for refactoring without destroying, least-privilege CI credentials, keeping the bill visible, and `terraform test`. https://lovemesomecoding.com/react-native/react-native-build-deploy https://lovemesomecoding.com/react-native/react-native-build-deploy Fri, 21 Aug 2026 15:00:00 GMT react-native The last mile, and the part web developers underestimate. `expo prebuild` and what it generates, EAS Build for machines you do not own, bundle identifiers, versioning and build numbers, environment configuration without leaking secrets, over-the-air updates and what they can and cannot change, and what App Store and Play Store review will ask you for. https://lovemesomecoding.com/typescript/typescript-type-assertions https://lovemesomecoding.com/typescript/typescript-type-assertions Fri, 21 Aug 2026 15:00:00 GMT typescript `as` is you overruling the checker, and it is the one construct here that can make a program crash. When it is legitimate, the double-assertion escape hatch and why needing it is a warning, non-null `!`, and then `satisfies` — the operator that checks a value against a type without widening it, which is what you usually wanted. https://lovemesomecoding.com/nestjs/nestjs-database-typeorm https://lovemesomecoding.com/nestjs/nestjs-database-typeorm Fri, 21 Aug 2026 15:00:00 GMT nestjs Entities, repositories, migrations and transactions. forRoot and forFeature, why synchronize must stay false, the column types that bite — bigint and numeric come back as strings — and a real transaction with a pessimistic row lock, which is the reason this app's writes go through NestJS rather than through a generated mutation. https://lovemesomecoding.com/java/java-code-snippets https://lovemesomecoding.com/java/java-code-snippets Thu, 20 Aug 2026 18:00:00 GMT java The last post in the track is a reference rather than a lesson: the lookups you will make over and over, in one place. Every snippet here compiles as written against Java 21. Strings Numbers and parsing Dates and times Collections Iterating Streams Files Records, Optional and switch Async with… https://lovemesomecoding.com/react/react-interview-questions https://lovemesomecoding.com/react/react-interview-questions Thu, 20 Aug 2026 15:00:00 GMT react Twenty-four senior-level questions and answers — what actually triggers a re-render, why three setState calls only count once, what breaks when you lie to a dependency array, a five-question section on Context, when memo silently does nothing, what error boundaries do not catch, and how to diagnose a slow page. Grounded in real code. https://lovemesomecoding.com/hasura/hasura-interview-questions https://lovemesomecoding.com/hasura/hasura-interview-questions Thu, 20 Aug 2026 15:00:00 GMT hasura The questions Hasura interviews actually ask, answered the way you would say them out loud. How Hasura generates a schema without resolvers, how permissions really work and why relationships do not cascade them, when to reach for an Action instead of a mutation, what an event trigger guarantees, the n+1 question, and the one that separates people who have shipped it: what you turn off before going to production. https://lovemesomecoding.com/python-advanced/python-advanced-interview-questions https://lovemesomecoding.com/python-advanced/python-advanced-interview-questions Wed, 19 Aug 2026 21:00:00 GMT python-advanced The questions that actually get asked, with answers that show understanding rather than recall. Mutable defaults, is versus ==, the GIL and what it does not mean, shallow copies, decorators, generators, and how to answer when you do not know. https://lovemesomecoding.com/python/python-code-snippets https://lovemesomecoding.com/python/python-code-snippets Wed, 19 Aug 2026 19:00:00 GMT python The short answers you keep looking up — read a file into a list, sort a dict by value, flatten a nested list, count occurrences, chunk a list, merge dicts, retry a call, time a block. Copy, paste, move on. https://lovemesomecoding.com/frontend-dev/frontend-dev-performance-and-accessibility https://lovemesomecoding.com/frontend-dev/frontend-dev-performance-and-accessibility Wed, 19 Aug 2026 18:00:00 GMT frontend-dev Two subjects in one post because they are the same subject: whether the person on the other end can actually use this. Bundle size and code splitting, the render cost you can measure, images, Core Web Vitals — then semantics, labels, focus order, keyboard operation and contrast, and the four checks that catch most of it. https://lovemesomecoding.com/java/java-best-practices https://lovemesomecoding.com/java/java-best-practices Wed, 19 Aug 2026 18:00:00 GMT java These are the habits that separate code a team can maintain from code they quietly rewrite. None of them is clever. All of them compound. Name things properly You write a name once and read it for years. The conventions are fixed and universal: PascalCase for types, camelCase for methods and… https://lovemesomecoding.com/spring-study-guide/spring-study-guide-testing https://lovemesomecoding.com/spring-study-guide/spring-study-guide-testing Tue, 18 Aug 2026 20:00:00 GMT spring-study-guide When a test needs Spring and when it does not. Plain unit tests with Mockito, the cached test context and what silently evicts it, slice tests versus @SpringBootTest, @MockitoBean, why a @Transactional test rolls back by default, testing controllers with MockMvc and a whole API over a real port — every example from a suite that runs green. https://lovemesomecoding.com/java/how-to-solve-java-problems https://lovemesomecoding.com/java/how-to-solve-java-problems Tue, 18 Aug 2026 18:00:00 GMT java Everyone gets stuck. The difference between an hour and a day is having a method instead of guessing. This post is that method — four steps, in order — plus the errors every Java beginner hits and what each one is really telling you. 1. Read the error. Actually read it. The most common mistake is… https://lovemesomecoding.com/backend-dev/backend-dev-deployment-and-observability https://lovemesomecoding.com/backend-dev/backend-dev-deployment-and-observability Tue, 18 Aug 2026 17:00:00 GMT backend-dev Code that only runs on your laptop is not finished. Building one artifact and configuring it per environment, secrets that are not in git, containers and what they actually fix, a deploy pipeline, health checks the load balancer can use, and logs, metrics and traces — enough to answer “is it broken and where” at 3am. https://lovemesomecoding.com/data-structure-algorithm/data-structure-algorithm-depth-first-search https://lovemesomecoding.com/data-structure-algorithm/data-structure-algorithm-depth-first-search Tue, 18 Aug 2026 16:00:00 GMT data-structure-algorithm Follow one path to its end, then back up and try the next. The same code as BFS with the queue swapped for a stack — the traversal strategy IS the container. Recursive and iterative forms, cycle detection, and how to choose between DFS and BFS. https://lovemesomecoding.com/terraform/terraform-github-actions-cicd https://lovemesomecoding.com/terraform/terraform-github-actions-cicd Tue, 18 Aug 2026 15:00:00 GMT terraform Plan on the pull request, apply on merge, and no AWS keys stored anywhere. Configuring GitHub's OIDC provider and the IAM role it assumes, posting the plan as a PR comment, the image build and push to ECR, rolling the ECS service onto the new image, and the concurrency group that stops two applies running at once. https://lovemesomecoding.com/react-native/react-native-internals https://lovemesomecoding.com/react-native/react-native-internals Tue, 18 Aug 2026 15:00:00 GMT react-native How the thing actually works. JavaScript runs in Hermes; your components are not drawn by a web view but turned into real native views. The old asynchronous bridge, why it was the bottleneck, and what JSI, Fabric and TurboModules replaced it with. What the New Architecture changes in practice, why Hermes matters for startup time, and how to reason about the two threads when something feels slow. https://lovemesomecoding.com/spring-boot/springboot-interview-questions https://lovemesomecoding.com/spring-boot/springboot-interview-questions Tue, 18 Aug 2026 15:00:00 GMT spring-boot Senior-level questions and answers, every one drawn from a real decision or a real bug in the pizza codebase rather than from a list. Auto-configuration, bean scopes, the proxy rule, transactions, N+1, stateless auth, and the trade-offs an interviewer is actually listening for. https://lovemesomecoding.com/typescript/typescript-mapped-and-conditional-types https://lovemesomecoding.com/typescript/typescript-mapped-and-conditional-types Tue, 18 Aug 2026 15:00:00 GMT typescript The machinery the utility types are built from. keyof and typeof and what they mean together, indexed access, mapped types with their modifiers, conditional types and infer. Ending with the expression this app uses in two files — `(typeof UserRole)[keyof typeof UserRole]` — read one piece at a time. https://lovemesomecoding.com/nestjs/nestjs-configuration https://lovemesomecoding.com/nestjs/nestjs-configuration Tue, 18 Aug 2026 15:00:00 GMT nestjs @nestjs/config, and why the useful pattern is not reading process.env through ConfigService but parsing every variable once into a typed object. Validating at startup so a bad value is an error that names it, isGlobal, getOrThrow, and registerAsync for the modules that need a value config has not produced yet. https://lovemesomecoding.com/python-advanced/python-advanced-machine-learning https://lovemesomecoding.com/python-advanced/python-advanced-machine-learning Mon, 17 Aug 2026 21:00:00 GMT python-advanced A first model, end to end and actually run: load the data, split it properly, fit a classifier, and measure it with something better than accuracy. What the workflow is, what the vocabulary means, and the leakage mistake that flatters every beginner. https://lovemesomecoding.com/python/python-best-practices https://lovemesomecoding.com/python/python-best-practices Mon, 17 Aug 2026 19:00:00 GMT python The conventions that make Python read like Python — PEP 8 and the formatter that enforces it, naming, EAFP over LBYL, comprehensions over loops over map, and the handful of habits that separate working code from code someone else can maintain. https://lovemesomecoding.com/frontend-dev/frontend-dev-auth-and-security https://lovemesomecoding.com/frontend-dev/frontend-dev-auth-and-security Mon, 17 Aug 2026 18:00:00 GMT frontend-dev Everything the browser runs is public, so a frontend guard is a courtesy and never a control. Login flows, where to put a token and the real trade between localStorage and an HttpOnly cookie, restoring a session on refresh, XSS and CSRF in the terms that actually bite, and what a Content-Security-Policy buys you. https://lovemesomecoding.com/java/java-debugging https://lovemesomecoding.com/java/java-debugging Mon, 17 Aug 2026 18:00:00 GMT java Debugging is a skill, not a talent, and most of it is one habit: read the error before you do anything else. Java's errors are unusually informative, and beginners routinely skip past them to start guessing. Reading a stack trace Four pieces of information, in order of usefulness: The message.… https://lovemesomecoding.com/react/react-sass https://lovemesomecoding.com/react/react-sass Mon, 17 Aug 2026 15:00:00 GMT react Sass in a Vite project is one dependency and a file rename — no config. Nesting, variables, partials and mixins in a component stylesheet, .module.scss to get scoping and Sass at once, and the one thing Sass still does that plain CSS cannot: recompile Bootstrap itself with your own colours. https://lovemesomecoding.com/angular/angular-interview-questions https://lovemesomecoding.com/angular/angular-interview-questions Mon, 17 Aug 2026 15:00:00 GMT angular The questions Angular interviews actually ask, answered the way you would say them out loud. Signals versus observables, why standalone replaced NgModules, how dependency injection resolves, what `OnPush` really does, template-driven versus reactive forms, and the change-detection question that separates people who have shipped Angular from people who have read about it. https://lovemesomecoding.com/docker/docker-interview-questions https://lovemesomecoding.com/docker/docker-interview-questions Mon, 17 Aug 2026 15:00:00 GMT docker The questions Docker interviews actually ask, answered the way you would say them out loud. Container versus VM, image versus container, `CMD` versus `ENTRYPOINT`, `COPY` versus `ADD`, how layer caching works, where volumes fit, and the "why is my image 1.2 GB" question that separates people who have shipped one. https://lovemesomecoding.com/hasura/hasura-ddn-data-modeling https://lovemesomecoding.com/hasura/hasura-ddn-data-modeling Mon, 17 Aug 2026 15:00:00 GMT hasura v3's metadata in depth, because in v3 the metadata is the product. Every object kind and what it is for — `DataConnectorLink`, `ObjectType`, `Model`, `Command`, `Relationship`, the boolean-expression, aggregate and order-by types, the three permission kinds, and the global config objects — worked through by modelling the same booking schema the v2 half of this track uses. https://lovemesomecoding.com/spring-study-guide/spring-study-guide-security https://lovemesomecoding.com/spring-study-guide/spring-study-guide-security Sun, 16 Aug 2026 20:00:00 GMT spring-study-guide Authentication, authorisation, and the filter chain that implements both. How a request travels through the filters, what the SecurityContext holds and how it is cleared, password hashing and salting, matcher ordering and the mistake that silently opens an endpoint, method security with @PreAuthorize, stateless JWT auth, and the lambda DSL that replaced every old configuration answer. https://lovemesomecoding.com/java/java-advanced-eclipse-hot-keys https://lovemesomecoding.com/java/java-advanced-eclipse-hot-keys Sun, 16 Aug 2026 18:00:00 GMT java Learning your IDE's shortcuts is one of the highest-return investments a developer makes, because the saving is small and repeated thousands of times. This is the Eclipse set worth memorising, with the IntelliJ equivalent alongside — most teams have both. Windows and Linux bindings are given first;… https://lovemesomecoding.com/backend-dev/backend-dev-testing https://lovemesomecoding.com/backend-dev/backend-dev-testing Sun, 16 Aug 2026 17:00:00 GMT backend-dev Tests are how you change code you did not write without being afraid. What is worth testing and what is theatre, unit tests that run in milliseconds, integration tests against a real database, testing the API through HTTP, test data that does not rot, and why chasing a coverage number produces a suite that catches nothing. https://lovemesomecoding.com/data-structure-algorithm/data-structure-algorithm-breadth-first-search https://lovemesomecoding.com/data-structure-algorithm/data-structure-algorithm-breadth-first-search Sun, 16 Aug 2026 16:00:00 GMT data-structure-algorithm Explore level by level using a queue — and get the shortest path in an unweighted graph for free, which no other traversal does. Reconstructing the path, why you mark visited on enqueue rather than dequeue, and where BFS stops being the right tool. https://lovemesomecoding.com/spring-boot/spring-boot-code-snippets https://lovemesomecoding.com/spring-boot/spring-boot-code-snippets Sun, 16 Aug 2026 15:00:00 GMT spring-boot The annotations and snippets from this whole track in one page, grouped by what you are trying to do — wire a bean, expose an endpoint, query a database, secure a route, cache a result, schedule a job. Written to be scanned rather than read, with a link to the lesson behind each one. https://lovemesomecoding.com/python-advanced/python-advanced-mysql https://lovemesomecoding.com/python-advanced/python-advanced-mysql Sat, 15 Aug 2026 21:00:00 GMT python-advanced Talking to a database from Python. The DB-API every driver implements, parameterised queries and the injection they prevent, transactions and context managers, connection pooling, and where an ORM earns its place. https://lovemesomecoding.com/python/python-debugging https://lovemesomecoding.com/python/python-debugging Sat, 15 Aug 2026 19:00:00 GMT python Reading a traceback properly — it is the answer, not the noise — then `breakpoint()` and the handful of pdb commands worth knowing, logging instead of print, and the half-dozen error messages that mean something specific. https://lovemesomecoding.com/frontend-dev/frontend-dev-routing-and-forms https://lovemesomecoding.com/frontend-dev/frontend-dev-routing-and-forms Sat, 15 Aug 2026 18:00:00 GMT frontend-dev The URL is state, and forms are where most of your users actually touch the app. Routes, nested layouts, guarded routes and the redirect-back pattern; then controlled inputs, what the browser validates for free, where validation has to be repeated on the server, and how to show a field error that came back from an API. https://lovemesomecoding.com/java/java-advanced-encryption-and-decryption https://lovemesomecoding.com/java/java-advanced-encryption-and-decryption Sat, 15 Aug 2026 18:00:00 GMT java Java's cryptography lives in javax.crypto and java.security . The single most important thing to know about it is that you should use it as little as possible: reach for a proven library or a managed service, and treat the raw API as something you need to read rather than write. This post covers…