Warnings for pattern matching

We examine the ML pattern-matching anomalies of useless clauses and non-exhaustive matches. We state the definition of these anomalies, building upon pattern matching semantics, and propose a simple algorithm to detect them. We have integrated the algorithm in the Objective Caml compiler, but we show that the same algorithm is also usable in a non-strict language such as Haskell. Or-patterns are considered for both strict and non-strict languages.

Alpaca – Algorithmic Pattern Catalogue

The Alpaca 2025 festival and conference on algorithmic patterns in the creative arts is happening this September 2025. Please see…

Agentic Engineering Patterns - Simon Willison's Weblog

Patterns for getting the best results out of coding agents like Claude Code and OpenAI Codex. See my introduction for more on this project.

Game Programming Patterns

I’m here to help! Game Programming Patterns is a collection of patterns I found in games that make code cleaner, easier to understand, and faster.

Patterns | Decent Patterns

Decent Patterns is a collective effort to further the adoption of decentralized technologies by providing open tooling and resources for the community.

How Patterns Work – Assembil

If you are new to sewing, this is an ideal first book to buy along with a comprehensive sewing book. If you’ve ever felt overwhelmed by all the markings on a commercial sewing pattern, How Patterns Work will help you to make sense of all the lines and help you to recognise common garment shapes. No prior experience of pattern making is needed.

Semble: Fast and Accurate Code Search for Agents

Fast and Accurate Code Search for Agents. Uses ~98% fewer tokens than grep+read

Fast regex search: indexing text for agent tools · Cursor

How we're building indexes for regular expression search so agents can find text in large monorepos without the 15-second ripgrep waits.

Report | Decent Patterns

Decent Patterns is a collective effort to further the adoption of decentralized technologies by providing open tooling and resources for the community.

Compiling Match Statements to Bytecode

Full pipeline deep dive for purple garden: AST, BB SSA IR, Bytecode, Optimisations

Uzu

Uzu - live coding pattern club

Anti-patterns: things to avoid - Agentic Engineering Patterns

Anti-patterns: things to avoid - Agentic Engineering Patterns

Anti-patterns: things to avoid - Agentic Engineering Patterns

Anti-patterns: things to avoid - Agentic Engineering Patterns

Anti-patterns | Impeccable

37 deterministic detection rules that flag the visible tells of AI-generated interfaces and common quality issues. Used by npx impeccable detect and the browser extension.

Slop | Impeccable

46 patterns that mark an interface as AI-generated, plus the live detection overlay that catches them in place. The rule catalog behind npx impeccable detect, the browser extension, and /impeccable critique.