Install Java and Write Your First Program
Install a modern JDK, verify the toolchain, and ship your first Java program from the command line without an IDE doing the magic for you.
·4 min read · #java#setup#beginner
Blog
1745 posts · page 32 of 37
Java Interfaces vs Abstract Classes
Choose between interfaces and abstract classes with confidence. Default methods, sealed interfaces, functional interfaces, and concrete decision rules.
·5 min read · #java#oop#intermediate
Java Streams and Lambdas: Functional Style on the JVM
Transform collections with lambdas and the Stream API. Map, filter, reduce, collectors, parallel streams, and the pitfalls of lazy pipelines.
·5 min read · #java#streams#intermediate
Java Variables and Primitive Types
Master Java primitives, reference types, literals, and casting. Know exactly what each type costs and where overflow and precision will bite you.
·5 min read · #java#types#beginner
Helm Basics: Kubernetes Package Manager
Learn Helm fundamentals: helm install, charts, values.yaml, templating, releases, and when to choose Helm over plain Kubernetes YAML manifests.
·6 min read · #kubernetes#helm#intermediate
JavaScript Closures Explained with Real Examples
A practical guide to JavaScript closures, lexical scope, the classic loop bug, and the patterns that make closures genuinely useful in production code.
·7 min read · #javascript#closures#intermediate
DOM Manipulation in Vanilla JavaScript
A modern guide to vanilla DOM manipulation: query selectors, creating and inserting nodes, event handling, delegation, and when a framework is actually worth it.
·7 min read · #javascript#dom#intermediate
The JavaScript Event Loop: Microtasks vs Macrotasks
Build an accurate mental model of the JavaScript event loop, the call stack, web APIs, the task and microtask queues, and why setTimeout zero is not really zero.
·7 min read · #javascript#event-loop#intermediate
Using the Fetch API in JavaScript
A practical guide to the Fetch API: GET and POST requests, JSON, headers, error handling, AbortController, and the 4xx/5xx rejection gotcha that bites everyone.
·7 min read · #javascript#fetch#intermediate
JavaScript Prototypes and Prototype Inheritance
Understand the JavaScript prototype chain, how Object.create works, what class syntax desugars to, and why this still matters in modern code.
·7 min read · #javascript#prototypes#intermediate
JavaScript this and Function Binding
Demystify the JavaScript this keyword with clear rules, arrow vs normal functions, bind/call/apply, class methods, and the bugs that catch every developer.
·7 min read · #javascript#this#intermediate
Linux Cron Jobs and systemd Timers
Master scheduled tasks on Linux. Learn crontab syntax, fix common PATH and environment pitfalls, and use systemd timers as a modern alternative.
·6 min read · #linux#cron#intermediate
Linux Networking Commands: ip, ss, curl, dig
A practical guide to modern Linux networking tools. Learn ip, ss, curl, and dig to diagnose connectivity, inspect sockets, and resolve DNS issues fast.
·6 min read · #linux#networking#intermediate
Logistic Regression for Binary Classification
Learn how logistic regression turns a linear score into a probability, how to train it with scikit-learn, and how to evaluate binary classifiers using ROC-AUC.
·5 min read · #machine-learning#classification#intermediate
Using the Anthropic Claude SDK in Python
A practical tour of the Anthropic Python SDK: messages, streaming, tool use, prompt caching, and patterns for shipping Claude in production.
·4 min read · #anthropic#claude#intermediate
LangChain Basics in Python: Chains, Tools, and Memory
Learn LangChain by building real components in Python: prompt templates, chains, tool calling, and memory. Practical patterns you can ship today.
·4 min read · #langchain#python#intermediate
Generating Text Embeddings with an API
A practical tutorial on text embeddings: vector intuition, calling an embeddings API, choosing dimensions, computing cosine similarity, and caching the results.
·7 min read · #llms#embeddings#intermediate
Using the OpenAI Python SDK End-to-End
A working tour of the OpenAI Python SDK: chat completions, streaming, structured output, embeddings, tool calls, and production-grade error handling.
·4 min read · #openai#python#intermediate
Next.js Metadata API for SEO
Master the Next.js Metadata API with static and dynamic titles, OpenGraph tags, sitemaps, and robots.txt to ship pages that rank and share well.
·6 min read · #nextjs#seo#intermediate
pgvector: Add Vector Search to Postgres
Use pgvector to run embeddings, similarity search, and hybrid retrieval inside Postgres. Schemas, indexes, and a working Python pipeline.
·4 min read · #pgvector#postgres#intermediate
Pinecone Vector Database: Index, Upsert, Query
Build a working vector search pipeline with Pinecone in Python. Indexes, upserts, metadata filters, hybrid search, and patterns for production RAG.
·4 min read · #pinecone#vector-database#intermediate
asyncio Basics in Python
A practical introduction to Python asyncio: the event loop, async/await, asyncio.run, gather, create_task, and when to pick async over threads.
·6 min read · #python#asyncio#intermediate
Python Regex Basics with the re Module
A practical introduction to Python regex with the re module: match, search, findall, sub, groups, named groups, raw strings, and compiling patterns for speed.
·6 min read · #python#regex#intermediate
Threading vs Multiprocessing in Python
Understand the Python GIL and pick the right concurrency tool: when threads help with I/O, when processes help with CPU, and how to use concurrent.futures.
·7 min read · #python#concurrency#intermediate
TanStack Query (React Query) for Data Fetching
Learn how TanStack Query replaces useEffect-based data fetching with caching, background refetching, and request deduplication that scales to real apps.
·6 min read · #react#data-fetching#intermediate
React Router Basics with Data Router APIs
Learn React Router's modern data APIs. Install, create a browser router, define routes, navigate with Link and useNavigate, and use loaders and actions for data.
·6 min read · #react#routing#intermediate
React Server Components: How They Actually Work
A clear, practical explanation of React Server Components: the runtime model, the boundary between server and client, data fetching, and the tradeoffs.
·6 min read · #react#server-components#intermediate
React Suspense and Lazy Loading Components
Use React.lazy and Suspense to code-split a React app, design fallback UI, place boundaries thoughtfully, and understand how Suspense extends to data fetching.
·6 min read · #react#performance#intermediate
useMemo and useCallback in React: When You Actually Need Them
A practical guide to React's useMemo and useCallback hooks, covering referential equality, when memoization helps performance, when it backfires, and how to profile first.
·6 min read · #react#performance#intermediate
useReducer in React and Why It Beats useState Sometimes
Understand React's useReducer hook, its signature, action shape, when to migrate from useState, and how to build a small state machine pattern for predictable UI logic.
·7 min read · #react#state-management#intermediate
Zustand: Minimal State Management for React
Skip the reducer boilerplate. Zustand gives React apps a tiny global store with hooks, selectors, and middleware in fewer than 100 lines of API.
·5 min read · #react#state-management#intermediate
Cargo Basics: Building, Testing, and Publishing Rust Code
A practical tour of Cargo — creating projects, managing dependencies and features, running tests, building release binaries, and using workspaces.
·6 min read · #rust#cargo#intermediate
Rust Collections: Vec, HashMap, and HashSet
A hands-on tour of Rust's core collections — Vec, HashMap, and HashSet — with common operations, iteration patterns, and ownership gotchas.
·6 min read · #rust#collections#intermediate
Rust Error Handling with Result and the ? Operator
A practical guide to error handling in Rust covering Result, the ? operator, unwrap and expect, custom error types, and the thiserror and anyhow crates.
·5 min read · #rust#error-handling#intermediate
Rust Structs and Enums: Modeling Data Safely
Learn how to model domain data in Rust with structs and enums, use pattern matching exhaustively, and lean on Option and Result for safety.
·5 min read · #rust#structs-enums#intermediate
Rust Traits: Shared Behavior Without Inheritance
Understand how Rust traits define shared behavior, with default methods, trait bounds, derive, and a clear take on dyn Trait versus impl Trait.
·6 min read · #rust#traits#intermediate
Postgres EXPLAIN and Practical Query Tuning
Learn how to read Postgres EXPLAIN and EXPLAIN ANALYZE output, spot expensive operations, and apply practical indexing and rewrite techniques to speed up queries.
·6 min read · #postgres#performance#intermediate
Database Normalization: 1NF, 2NF, 3NF Made Practical
A practical guide to database normalization with real customer and order examples. Covers 1NF, 2NF, 3NF, when to denormalize, and tradeoffs.
·6 min read · #sql#schema-design#intermediate
SQL Window Functions: ROW_NUMBER, RANK, and LAG
Learn SQL window functions with practical examples. Covers ROW_NUMBER, RANK, DENSE_RANK, LAG, LEAD, running totals, and the OVER clause in depth.
·6 min read · #sql#window-functions#intermediate
Tailwind Dark Mode: class Strategy Done Right
Set up dark mode in Tailwind with the class strategy, persist the choice in localStorage, and avoid the flash of wrong theme on first paint.
·5 min read · #tailwind#dark-mode#intermediate
System Design: Design a Distributed Cache (Redis-like)
Design a distributed in-memory cache like Redis or Memcached. Covers consistent hashing, replication, eviction, persistence, and surviving node failures cleanly.
·6 min read · #system-design#caching#intermediate
System Design: Design a Load Balancer
Design a layer 4 and layer 7 load balancer. Covers algorithms, health checks, sticky sessions, TLS termination, and surviving traffic spikes without dropping connections.
·5 min read · #system-design#load-balancer#intermediate
System Design: Design a Message Queue (Kafka-like)
Design a durable message queue like Kafka or Pulsar. Covers partitions, replication, consumer groups, ordering guarantees, and exactly-once semantics in practice.
·5 min read · #system-design#messaging#intermediate
System Design: Design a URL Shortener (TinyURL/Bit.ly)
Design a URL shortener like TinyURL or Bit.ly. Covers ID generation, storage, read-heavy scaling, caching, analytics, and tradeoffs you should defend in an interview.
·5 min read · #system-design#url-shortener#intermediate
Progressive Web Apps (PWA): What They Are and When To Build One
A practical introduction to PWAs: manifests, service workers, offline caching, install prompts, and when a PWA is the right choice versus a native app.
·6 min read · #pwa#service-workers#intermediate
Web Accessibility WCAG Essentials Every Dev Should Know
A practical guide to the WCAG fundamentals: semantic HTML, keyboard support, contrast, focus management, and ARIA used responsibly.
·5 min read · #accessibility#wcag#intermediate
Web Vitals Explained: LCP, INP, CLS in Plain English
What Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift measure, how to read them, and the practical fixes that move each one.
·5 min read · #performance#web-vitals#intermediate
Integration Tests vs Unit Tests: The Right Mix
A practical look at integration testing alongside unit tests, covering fixtures, real databases in tests, and the right balance with examples in pytest and vitest.
·6 min read · #testing#integration-tests#intermediate