will-keleher.com https://will-keleher.com/ I don't think I can build a fence with these posts... Telling a Computer to Do Things https://will-keleher.com/posts/telling-your-computer-to-do-things/ https://will-keleher.com/posts/telling-your-computer-to-do-things/ Thu, 16 Apr 2026 00:00:00 +0000 Don't Forget to Set EDITOR and VISUAL https://will-keleher.com/posts/dont-forget-to-set-editor-and-visual/ https://will-keleher.com/posts/dont-forget-to-set-editor-and-visual/ Wed, 15 Apr 2026 00:00:00 +0000 The Post-mortem Spectrum https://will-keleher.com/posts/the-post-mortem-spectrum/ https://will-keleher.com/posts/the-post-mortem-spectrum/ Fri, 10 Apr 2026 00:00:00 +0000 Small Programming Tricks https://will-keleher.com/posts/small-programming-tricks-matter/ https://will-keleher.com/posts/small-programming-tricks-matter/ Thu, 19 Mar 2026 00:00:00 +0000 You're already running canary servers https://will-keleher.com/posts/nary-an-error-with-canary/ https://will-keleher.com/posts/nary-an-error-with-canary/ Wed, 18 Mar 2026 00:00:00 +0000 and these screenshots prove I did it https://will-keleher.com/posts/and-these-screenshots-prove-i-did-it/ https://will-keleher.com/posts/and-these-screenshots-prove-i-did-it/ Mon, 16 Mar 2026 00:00:00 +0000 this css proves me human https://will-keleher.com/posts/this-css-makes-me-human/ https://will-keleher.com/posts/this-css-makes-me-human/ Fri, 06 Mar 2026 00:00:00 +0000 Ratcheting SQL Queries: reducing a database's load by 1/4th with a simple change https://will-keleher.com/posts/ratcheting-sql-queries/ https://will-keleher.com/posts/ratcheting-sql-queries/ Thu, 05 Mar 2026 00:00:00 +0000 Script Your Code Migrations https://will-keleher.com/posts/script-your-code-migrations/ https://will-keleher.com/posts/script-your-code-migrations/ Thu, 05 Mar 2026 00:00:00 +0000 An Elegy for my Beloved Slow Query Logs https://will-keleher.com/posts/augment-your-slow-query-logs/ https://will-keleher.com/posts/augment-your-slow-query-logs/ Wed, 04 Mar 2026 00:00:00 +0000 Store Every Request https://will-keleher.com/posts/store-every-request/ https://will-keleher.com/posts/store-every-request/ Fri, 27 Feb 2026 00:00:00 +0000 More Shell Patterns I Use Weekly https://will-keleher.com/posts/more-shell-patterns-i-use-weekly/ https://will-keleher.com/posts/more-shell-patterns-i-use-weekly/ Fri, 27 Feb 2026 00:00:00 +0000 Nano Banana 2 Partially Passes the Seven-legged Spider Test https://will-keleher.com/posts/nano-banana-2-partially-passes-the-spider-test/ https://will-keleher.com/posts/nano-banana-2-partially-passes-the-spider-test/ Thu, 26 Feb 2026 00:00:00 +0000 (Almost) Every table needs `request_uuid` https://will-keleher.com/posts/you-should-store-request_uuids-in-tables/ https://will-keleher.com/posts/you-should-store-request_uuids-in-tables/ Wed, 25 Feb 2026 00:00:00 +0000 CSS Tweaks for This Site That Make Me Happy https://will-keleher.com/posts/css-tweaks-for-this-blog-that-make-me-happy/ https://will-keleher.com/posts/css-tweaks-for-this-blog-that-make-me-happy/ Tue, 24 Feb 2026 00:00:00 +0000 Literal and Optional Parameters Can Make Code Hard to Read (in TypeScript) https://will-keleher.com/posts/i-hate-literal-arguments/ https://will-keleher.com/posts/i-hate-literal-arguments/ Thu, 12 Feb 2026 21:11:40 +0000 How I Review LLM-generated Code https://will-keleher.com/posts/reviewing-llm-generated-code/ https://will-keleher.com/posts/reviewing-llm-generated-code/ Thu, 05 Feb 2026 00:00:00 +0000 It's 2026, and I'm still leery of using LLMs to generate code https://will-keleher.com/posts/leery-of-using-ai-to-generate-code/ https://will-keleher.com/posts/leery-of-using-ai-to-generate-code/ Wed, 04 Feb 2026 00:00:00 +0000 You probably don't need `find` https://will-keleher.com/posts/you-probably-dont-need-find/ https://will-keleher.com/posts/you-probably-dont-need-find/ Wed, 04 Feb 2026 00:00:00 +0000 Three Technical Tricks for Non-technical Writers in Google Docs https://will-keleher.com/posts/three-technical-tricks-for-non-technical-writers/ https://will-keleher.com/posts/three-technical-tricks-for-non-technical-writers/ Fri, 30 Jan 2026 00:00:00 +0000 Useless shell commands https://will-keleher.com/posts/useless-shell-commands/ https://will-keleher.com/posts/useless-shell-commands/ Wed, 28 Jan 2026 00:00:00 +0000 Why doesn't MySQL's query planner rewrite some `ORDER BY.. LIMIT` queries to use a `UNION` strategy? No clue. https://will-keleher.com/posts/mysql-degenerate-query-plan/ https://will-keleher.com/posts/mysql-degenerate-query-plan/ Sat, 22 Nov 2025 00:00:00 +0000 A one-table SQL query will often use a single index https://will-keleher.com/posts/sql-queries-rarely-use-multiple-indexes/ https://will-keleher.com/posts/sql-queries-rarely-use-multiple-indexes/ Wed, 08 Oct 2025 00:00:00 +0000 You should lint your TODOs https://will-keleher.com/posts/you-should-lint-your-todos/ https://will-keleher.com/posts/you-should-lint-your-todos/ Mon, 22 Sep 2025 00:00:00 +0000 You probably want some parts of Lodash https://will-keleher.com/posts/you-probably-want-lodash/ https://will-keleher.com/posts/you-probably-want-lodash/ Sun, 21 Sep 2025 00:00:00 +0000 Draw a Silhouette of a Spider Missing its Front Left Leg https://will-keleher.com/posts/draw-a-silhouette-of-a-spider-missing-its-front-left-leg/ https://will-keleher.com/posts/draw-a-silhouette-of-a-spider-missing-its-front-left-leg/ Tue, 24 Jun 2025 00:00:00 +0000 Don't lecture when teaching software engineering https://will-keleher.com/posts/how-to-create-effective-learning-materials-at-engineering-orgs/ https://will-keleher.com/posts/how-to-create-effective-learning-materials-at-engineering-orgs/ Fri, 04 Apr 2025 00:00:00 +0000 I avoid easy things I haven't tried https://will-keleher.com/posts/i-avoid-easy-things-i-havent-tried/ https://will-keleher.com/posts/i-avoid-easy-things-i-havent-tried/ Thu, 03 Apr 2025 00:00:00 +0000 Why I avoid test stubs in TypeScript https://will-keleher.com/posts/why-i-dislike-stubs/ https://will-keleher.com/posts/why-i-dislike-stubs/ Tue, 01 Apr 2025 00:00:00 +0000 Most engineers have git aliases; what are yours? https://will-keleher.com/posts/what-are-your-git-aliases/ https://will-keleher.com/posts/what-are-your-git-aliases/ Wed, 26 Mar 2025 00:00:00 +0000 When helping elves, you should use complex numbers to navigate in 2D https://will-keleher.com/posts/2d-navigation-with-imaginary-numbers-is-better/ https://will-keleher.com/posts/2d-navigation-with-imaginary-numbers-is-better/ Sat, 21 Dec 2024 00:00:00 +0000 18,957 tests in under 6 minutes: ClassDojo's approach to backend testing https://will-keleher.com/posts/classdojos-approach-to-backend-testing/ https://will-keleher.com/posts/classdojos-approach-to-backend-testing/ Fri, 13 Dec 2024 00:00:00 +0000 XKCD's "Is It Worth the Time?" Considered Harmful https://will-keleher.com/posts/its-not-worth-the-time-yet/ https://will-keleher.com/posts/its-not-worth-the-time-yet/ Fri, 13 Dec 2024 00:00:00 +0000 Python patterns I learned during last year's Advent of Code https://will-keleher.com/posts/small-python-things-i-learned-during-advent-of-code/ https://will-keleher.com/posts/small-python-things-i-learned-during-advent-of-code/ Wed, 13 Nov 2024 00:00:00 +0000 Indexes are sorted arrays (sort of) https://will-keleher.com/posts/indexes_are_like_sorted_arrays/ https://will-keleher.com/posts/indexes_are_like_sorted_arrays/ Mon, 14 Aug 2023 00:00:00 +0000 JSDoc comments can make fixtures easier to work with https://will-keleher.com/posts/jsdoc-comments-on-fixtures/ https://will-keleher.com/posts/jsdoc-comments-on-fixtures/ Sun, 23 Jul 2023 00:00:00 +0000 So, what can you do with a process ID? https://will-keleher.com/posts/what-can-you-do-with-a-pid/ https://will-keleher.com/posts/what-can-you-do-with-a-pid/ Sat, 10 Dec 2022 00:00:00 +0000 Why does `zip(*[iter(s)]*n)` chunk s into n chunks in Python? https://will-keleher.com/posts/chunking-in-python/ https://will-keleher.com/posts/chunking-in-python/ Sat, 10 Dec 2022 00:00:00 +0000 Culling Containers with a Leaky Bucket https://will-keleher.com/posts/cullingcontainerswithaleakybucket/ https://will-keleher.com/posts/cullingcontainerswithaleakybucket/ Mon, 24 Oct 2022 00:00:00 +0000 Setting up Image Previews using Puppeteer, Make, and CSS transforms https://will-keleher.com/posts/setting-up-image-previews/ https://will-keleher.com/posts/setting-up-image-previews/ Thu, 20 Oct 2022 00:00:00 +0000 Writing FizzBuzz in MySQL 5.7 for no good reason https://will-keleher.com/posts/fizzbuzz-in-mysql-5.7/ https://will-keleher.com/posts/fizzbuzz-in-mysql-5.7/ Thu, 07 Jul 2022 00:00:00 +0000 Using NodeJS's AsyncLocalStorage to Instrument a Webserver https://will-keleher.com/posts/asynclocalstorage_in_detail/ https://will-keleher.com/posts/asynclocalstorage_in_detail/ Mon, 30 May 2022 00:00:00 +0000 Large Analytics SQL Queries are a Code Smell https://will-keleher.com/posts/large-sql-queries-are-bad/ https://will-keleher.com/posts/large-sql-queries-are-bad/ Wed, 11 May 2022 00:00:00 +0000 Shell Patterns for Easy Automated Code Migrations https://will-keleher.com/posts/tricks-for-automated-code-migrations/ https://will-keleher.com/posts/tricks-for-automated-code-migrations/ Wed, 11 May 2022 00:00:00 +0000 Red and Blue Function Mistakes in JavaScript https://will-keleher.com/posts/red-blue-function-mistakes-in-js/ https://will-keleher.com/posts/red-blue-function-mistakes-in-js/ Fri, 25 Mar 2022 00:00:00 +0000 Slack is the Worst Info-Radiator https://will-keleher.com/posts/slack_is_the_worst_info_radiator/ https://will-keleher.com/posts/slack_is_the_worst_info_radiator/ Mon, 06 Dec 2021 00:00:00 +0000 Bash Patterns I Use Weekly https://will-keleher.com/posts/4-useful-bash-patterns/ https://will-keleher.com/posts/4-useful-bash-patterns/ Mon, 22 Nov 2021 00:00:00 +0000 Canary Containers at ClassDojo in Too Much Detail https://will-keleher.com/posts/canary-containers-at-classdojo-in-too-much-detail/ https://will-keleher.com/posts/canary-containers-at-classdojo-in-too-much-detail/ Tue, 02 Nov 2021 00:00:00 +0000 MongoDB Performance is Disk-graceful https://will-keleher.com/posts/mongo_performance_is_disk-graceful/ https://will-keleher.com/posts/mongo_performance_is_disk-graceful/ Fri, 22 Oct 2021 00:00:00 +0000 Node's `AsyncLocalStorage` Makes the Commons Legible https://will-keleher.com/posts/asynclocalstorage_makes_the_commons_legible/ https://will-keleher.com/posts/asynclocalstorage_makes_the_commons_legible/ Wed, 18 Aug 2021 00:00:00 +0000 The 3 things I didn't understand about TypeScript https://will-keleher.com/posts/3-typescript-misunderstandings/ https://will-keleher.com/posts/3-typescript-misunderstandings/ Tue, 10 Aug 2021 00:00:00 +0000 HyperLogLog-orrhea: how do HyperLogsLogs work? https://will-keleher.com/posts/hyperloglog-orrhea/ https://will-keleher.com/posts/hyperloglog-orrhea/ Wed, 14 Jul 2021 00:00:00 +0000 ERROR, WARN, and INFO aren't actionable logging levels https://will-keleher.com/posts/your_logging_taxonomy_should_be_actionable/ https://will-keleher.com/posts/your_logging_taxonomy_should_be_actionable/ Tue, 13 Jul 2021 00:00:00 +0000 Graceful server shutdowns behind HAProxy https://will-keleher.com/posts/graceful_web-server_shutdowns_behind_haproxy/ https://will-keleher.com/posts/graceful_web-server_shutdowns_behind_haproxy/ Mon, 12 Jul 2021 00:00:00 +0000