Python

Line coverage tells you where the tests went. Mutation testing tells you whether the tests you have would notice if the code were wrong. A plain-language getting-started guide with mutmut.

Not a catalog of the Gang of Four patterns — an argument for why they’re foundational. Design patterns are a shared vocabulary that lets you read a codebase’s architectural intent from the names alone, and the value of that shared language transcends any specific programming language.

A jargon-free introduction to hexagonal architecture — the idea that your business logic should sit in the middle and the outside world (databases, screens, APIs, tests) should plug into it through simple, agreed-upon shapes. Small worked examples in Python, Go, and Rust show what changes when a new requirement arrives.

A tour of regular expressions shallow enough to onboard a beginner and deep enough to refresh an expert — literals, quantifiers, groups, lookaround, and the engine differences between PCRE-family backtrackers and RE2-family linear-time engines that power grep, Python, Go, and Rust.

How to publish Python, Go, and Rust command-line tools through your own Homebrew tap — including a personal GitHub account, GoReleaser and cargo-dist for platform builds, and go-semantic-release for automatic version bumps that flow all the way through to brew upgrade.