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David K 🎹
@DavidKPiano
Making state machines at @statelyai · I play piano
Orlando, FL
stately.ai
Joined December 2012
2,702
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86.6K
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  • Pinned
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    David K 🎹
    @DavidKPiano
    Apr 28, 2023
    We're making it even easier to create state diagrams. ➡️ state . new
    00:00
    356K
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    David K 🎹
    @DavidKPiano
    Aug 29, 2020
    Facebook is extremely over-engineered for a birthday reminder app
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    David K 🎹
    @DavidKPiano
    May 30, 2025
    Replying to @jacobmparis
    That's easy URL stands for Uniform Resource Locator URI stands for Uniform Resource Iocator
    104K
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    David K 🎹
    @DavidKPiano
    Sep 10, 2024
    Interviewer: Invert this binary tree Junior dev: Here's the algorithm I memorized Experienced dev: Let me find a library for that Senior dev: Does inverting the tree align with our core business objectives?
    600K
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    David K 🎹
    @DavidKPiano
    Aug 15, 2019
    Developers: lets/ ├ store ├ files ├ in └ some/ ├ super ├ organized └ opinionated/ ├ hierarchical └ structure Also developers: import { something } from "../../../../../../../"
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    David K 🎹
    @DavidKPiano
    Jul 22, 2019
    Junior dev: "why isn't this working?" Senior dev: "oh, you just need to do X, Y, and Z" Junior dev: (wow they're so smart) Senior dev: (wow I made that mistake so many times)
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    David K 🎹
    @DavidKPiano
    Jul 28, 2025
    Why hire a $150k/year dev when you can just pay $200/month for an AI coding agent and $200k/year for a dev to fix its code?
    206K
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    David K 🎹
    @DavidKPiano
    Nov 13, 2025
    I have no idea what to name my baby At this point I'll just name him "utils"
    234K
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    David K 🎹
    @DavidKPiano
    Nov 25, 2022
    GitHub Copilot is really amazing. I used to spend hours writing error-prone & sometimes incorrect code manually, but now, that error-prone incorrect code is automatically generated in seconds.
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    David K 🎹
    @DavidKPiano
    Jun 11, 2019
    Developers: "I guess accessibility is important to some people, we'll get around to it" Developers at conferences: 🗣️ "CAN YOU INCREASE THE FONT SIZE I CAN'T READ THE CODE"
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    David K 🎹
    @DavidKPiano
    Aug 31, 2022
    ⚛️ React tip: when conditionally rendering component based on some string enum (like a role), use an object to map enum values to components. This can be cleaner than using conditional operators, and it keeps the logic organized & clear.
    Screenshot of code showing clear mapping between role and component. const RoleViews = { ADMIN: AdminView, EDITOR: EditorView, GUEST: GuestView, // ... }; const SomeComponent = () => { const role = useGetUserRole(); const RoleSpecificView = RoleViews[role] ?? DefaultView; return ( <main> <RoleSpecificView /> </main> ); };
    Screenshot of code showing description of difficult to read and hard to understand mapping between role and component. const SomeComponent = () => { const role = useGetUserRole(); return ( <main> {role === 'ADMIN' ? ( <AdminView /> ) : role === 'EDITOR' ? ( <EditorView /> ) : role === 'GUEST' ? ( <GuestView /> ) : ( <div>Default view</div> )} </main> ); };
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    David K 🎹
    @DavidKPiano
    Apr 23, 2018
    The levels of testing code
    Manually test the code Write hundreds of unit & integration tests for the code Model the code and automatically generate exhaustive tests for every possible permutation of the code Formally prove that it is mathematically impossible for the code to have bugs Delete the code
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    David K 🎹
    @DavidKPiano
    Apr 29, 2020
    Junior developers: "I have no idea how to solve this one problem; I'll never get good if I just keep Googling for the answer" Senior developers: (46 tabs open to Google and StackOverflow for one problem)
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    David K 🎹
    @DavidKPiano
    Sep 19, 2025
    If you're using Tailwind, don't sleep on child selectors. They clean up your styles and eliminate repetition. Vibe coding agents aren't smart enough to do this. (if you're using CSS, keep scrolling)
    Before <table> <tr> <td className="px-3 py-2">CSS</td> <td className="px-3 py-2">Great</td> </tr> <tr> <td className="px-3 py-2">Tailwind</td> <td className="px-3 py-2">Fine</td> </tr> </table> After <table className="[&_td]:px-3 [&_td]:py-2"> <tr> <td>CSS</td> <td>Great</td> </tr> <tr> <td>Tailwind</td> <td>Fine</td> </tr> </table>
    420K