TIL

Replace mkdir, cp, and chmod with a single install command. Copy files, create directories, and set permissions in one step with GNU coreutils.

Understand TypeIs vs TypeGuard in Python: TypeIs provides more intuitive type narrowing by narrowing both positive and negative branches.

Replace inheritance with the Strategy pattern in Go using interfaces. Achieve composable, testable code without class hierarchies.

Build retry logic in Go without reflection using generics. Implement exponential backoff and configurable retry strategies with type safety.

Master Go type assertions with i.(T) syntax and type switches. Extract concrete types from interfaces safely with ok idiom examples.

Mock pydantic_settings in pytest tests by patching the settings class to prevent flaky tests from environment variable dependencies.

Track dev dependencies like golangci-lint in go.mod with a tools.go file and build tags to exclude them from production binaries.

Properly annotate Python *args and **kwargs with heterogeneous types using Unpack, TypedDict, and modern type hints from PEP-692.

Enforce immutable dataclasses at type-check time with @final decorator to catch mutations before runtime without frozen=True performance cost.

Build a CGI script from scratch using Go's stdlib and Bash. Understand why Common Gateway Interface fell out of favor for modern web apps.

Set up VSCode debugger for containerized Python applications using debugpy. Step-by-step guide with Docker Compose and launch configurations.

Manage dotfiles across devices with GNU Stow. Symlink configuration files from git repo to home directory with simple, idempotent commands.

Host Google Fonts locally in Hugo without CDN dependency. Download woff2 files, configure CSS, and improve performance while maintaining GDPR compliance.

Build a working round-robin load balancer in Go with goroutines and the standard library. No dependencies needed for this educational prototype.

Control goroutine concurrency with buffered channels as semaphores. Prevent resource exhaustion with backpressure patterns in Go workers.