TDD Workflow with a Real-World Example
Walk through the red-green-refactor cycle step by step, building a password validator to learn practical test-driven development.
·8 min read · #testing#tdd#test-driven-development
Blog
1745 posts · page 15 of 37
Mocks, Stubs, Spies, and Fakes Compared
Understand the differences between test doubles: mocks, stubs, spies, and fakes, with practical examples in JavaScript and Python.
·7 min read · #testing#mocking#test-doubles
Visual Regression Testing with Playwright
Catch unintended UI changes automatically by comparing screenshots with Playwright's built-in visual comparison tools.
·7 min read · #testing#playwright#visual-regression
TypeScript Assertion Functions for Runtime Validation
Use assertion functions to narrow types at runtime, replacing manual throw-and-cast patterns with compiler-understood safety checks.
·6 min read · #typescript#assertion-functions#type-narrowing
The Builder Pattern in TypeScript With Type Safety
Implement the builder pattern in TypeScript with compile-time enforcement of required fields using generics and conditional types.
·6 min read · #typescript#design-patterns#builder
TypeScript Declaration Files and .d.ts Explained
Learn how TypeScript declaration files work, when to write your own .d.ts files, and how to type untyped JavaScript libraries.
·6 min read · #typescript#declaration-files#d-ts
TypeScript Project References for Monorepos
Set up TypeScript project references to manage multi-package monorepos with incremental builds, clean boundaries, and fast compilation.
·6 min read · #typescript#project-references#monorepos
TypeScript typeof and keyof Operators in Practice
Master the typeof and keyof type operators to derive types from values and extract object keys for type-safe lookups and mappings.
·6 min read · #typescript#typeof#keyof
Docker Compose Patterns for Production
Production-ready Docker Compose patterns: override files, healthchecks, resource limits, logging, and secrets management.
·5 min read · #docker#docker-compose#production
Docker Layer Caching Strategies to Speed Up Builds
Master Docker layer caching: instruction ordering, cache mounts, BuildKit inline cache, and CI registry caching for faster builds.
·6 min read · #docker#caching#performance
Docker Multi-Stage Builds: Advanced Optimization Techniques
Go beyond basic multi-stage builds. Learn cache mounts, parallel stages, and distroless bases to shrink Docker images by 90%.
·6 min read · #docker#multi-stage-builds#optimization
Go Channel and Select Statement Patterns
Master Go channels and select statements with patterns for fan-out, fan-in, timeouts, cancellation, and pipeline composition.
·7 min read · #go#channels#concurrency
Context Patterns for Production Go Code
Learn production-grade context patterns in Go including timeouts, cancellation propagation, value passing, and middleware integration.
·6 min read · #go#context#production
Struct Embedding and Composition Patterns in Go
Learn Go composition over inheritance with struct embedding, interface embedding, and practical patterns for clean architecture.
·6 min read · #go#composition#design-patterns
Error Wrapping Strategies in Go
Master Go error wrapping with fmt.Errorf %w, errors.Is, errors.As, and custom error types for clear, debuggable error chains.
·6 min read · #go#error-handling#best-practices
Real-World Go Generics Examples Beyond Tutorials
Practical Go generics patterns for production code: type-safe collections, result types, repository layers, and functional helpers.
·7 min read · #go#generics#advanced
HTTP Middleware Chaining Patterns in Go
Build composable HTTP middleware in Go for logging, auth, rate limiting, and recovery using standard library patterns.
·6 min read · #go#http#middleware
Race Detector and Debugging Concurrent Go Code
Use Go's race detector to find and fix data races, plus tools and patterns for debugging concurrent programs effectively.
·7 min read · #go#concurrency#debugging
Structured Logging in Go with slog
Learn Go's slog package for structured, leveled logging with JSON output, custom handlers, and context-aware log enrichment.
·5 min read · #go#logging#observability
Go Sync Primitives: Mutex, RWMutex, WaitGroup, and Once
A practical guide to Go sync primitives including Mutex, RWMutex, WaitGroup, Once, and when to choose each over channels.
·6 min read · #go#concurrency#sync
Table-Driven Tests and Test Helpers in Go
Write clear, maintainable Go tests using table-driven patterns, test helpers, subtests, and cleanup functions.
·7 min read · #go#testing#best-practices
Kubernetes Network Policies: Pod-to-Pod Security Guide
Lock down pod communication with Kubernetes NetworkPolicies. Learn ingress and egress rules, label selectors, and namespace isolation.
·6 min read · #kubernetes#network-policies#security
Kubernetes Resource Limits, Requests, and QoS Classes
Set CPU and memory requests and limits correctly. Understand QoS classes, OOMKilled errors, and CPU throttling in Kubernetes.
·7 min read · #kubernetes#resources#qos
Kubernetes Rolling Updates and Rollback Strategies
Master zero-downtime deployments with Kubernetes rolling updates, rollback commands, and deployment strategies like blue-green and canary.
·7 min read · #kubernetes#rolling-updates#deployments
AbortController Patterns: Cancel Fetch, Timeouts, and Event Listeners
Master AbortController in JavaScript -- cancel fetch requests, debounce events, set timeouts, and build cancellable async workflows.
·6 min read · #javascript#abort-controller#fetch
JavaScript Event Loop, Microtasks, and Macrotasks Explained
Visualize how the JavaScript event loop works -- understand the call stack, microtask queue, macrotask queue, and execution order.
·6 min read · #javascript#event-loop#async
Generators, Iterators, and Symbol.iterator in JavaScript
Master JavaScript generators and iterators -- learn function*, yield, Symbol.iterator, and how to build custom iterable objects.
·6 min read · #javascript#generators#iterators
The Intl API: Format Numbers, Dates, and Strings Like a Pro
Master the JavaScript Intl API for locale-aware formatting of numbers, currencies, dates, relative time, and list conjunctions.
·6 min read · #javascript#intl#internationalization
JavaScript Pattern Matching: switch(true) and the TC39 Proposal
Explore pattern matching in JavaScript today with switch(true), and preview the TC39 pattern matching proposal for cleaner conditional logic.
·7 min read · #javascript#pattern-matching#tc39
Private Class Fields (#) and Static Blocks in JavaScript
Learn JavaScript private class fields with #, static blocks, private methods, and how they compare to closures and WeakMap patterns.
·6 min read · #javascript#classes#private-fields
Proxy and Reflect API for JavaScript Metaprogramming
Learn how to use JavaScript Proxy and Reflect to intercept operations, build validators, create observable objects, and write metaprogramming patterns.
·6 min read · #javascript#proxy#reflect
The Temporal API: A Modern Replacement for JavaScript Dates
Explore the Temporal API for JavaScript -- a modern, immutable, and time-zone-aware replacement for the legacy Date object.
·6 min read · #javascript#temporal#dates
WeakMap and WeakSet Use Cases in JavaScript
Understand JavaScript WeakMap and WeakSet, their garbage collection behavior, and practical use cases like caching, private data, and DOM metadata.
·6 min read · #javascript#weakmap#weakset
Python Concurrency: Threading vs Multiprocessing vs Asyncio
Compare Python's concurrency models -- threading, multiprocessing, and asyncio -- with practical examples and performance guidance.
·6 min read · #python#concurrency#threading
Python Context Managers: A Deep Dive
Learn how Python context managers work under the hood, build custom ones with classes and contextlib, and explore advanced patterns.
·5 min read · #python#context-managers#resource-management
Advanced Python Dataclasses: Beyond the Basics
Go beyond basic dataclass usage with post-init processing, field factories, inheritance, frozen instances, and custom serialization.
·6 min read · #python#dataclasses#oop
Python Descriptors and Properties: The Complete Guide
Understand Python's descriptor protocol, how properties work internally, and how to build reusable validation descriptors.
·6 min read · #python#descriptors#properties
Python itertools Recipes: Practical Patterns for Efficient Iteration
Master Python's itertools module with practical recipes for grouping, windowing, chaining, and processing iterables efficiently.
·7 min read · #python#itertools#functional-programming
Python Memory Management and Garbage Collection Internals
Explore how CPython manages memory with reference counting, generational garbage collection, and practical tips to avoid memory leaks.
·6 min read · #python#memory-management#garbage-collection
Python Metaclasses Explained: Understanding the Class of a Class
Demystify Python metaclasses with practical examples. Learn how classes are created, when to use metaclasses, and real-world patterns.
·5 min read · #python#metaclasses#oop
Python pathlib: The Complete Guide to Modern File Paths
Replace os.path with pathlib for cleaner, more readable file path handling in Python. Covers all essential operations with examples.
·5 min read · #python#pathlib#file-system
Python __slots__: Memory Optimization for Classes
Learn how __slots__ reduces memory usage in Python classes, when to use it, and the trade-offs involved.
·6 min read · #python#memory-optimization#slots
React Compiler and Automatic Memoization
Understand how the React Compiler works, what automatic memoization means, and how it eliminates the need for useMemo, useCallback, and React.memo.
·6 min read · #react#performance#compiler
React Concurrent Features: useTransition, useDeferredValue, and More
Master React's concurrent rendering features including useTransition, useDeferredValue, and strategies for keeping your UI responsive.
·6 min read · #react#performance#concurrent
React Context Performance: Splitting, Memoizing, and Selectors
Solve React Context performance problems with provider splitting, value memoization, selector patterns, and smart composition strategies.
·5 min read · #react#context#performance
Testing Custom React Hooks with renderHook
Learn how to test custom React hooks using renderHook from React Testing Library, covering state, effects, async behavior, and context.
·6 min read · #react#testing#hooks
React Error Boundary Patterns and Recovery Strategies
Master error boundary patterns in React including granular boundaries, recovery strategies, logging, and the react-error-boundary library.
·5 min read · #react#error-handling#patterns
React Server Functions Explained
Learn how Server Functions with 'use server' let you call backend logic directly from React components without building API routes.
·5 min read · #react#server-components#full-stack