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onChange(e.target.value)} placeholder={charge ? \"e.g. −2…\" : \"e.g. SO₄…\"} pattern={charge ? CHARGE_PATTERN : FORMULA_PATTERN} inputMode={charge ? \"tel\" : \"text\"} autoComplete=\"off\" spellCheck={false} aria-label={charge ? \"Charge\" : \"Formula\"} className=\"min-w-0 flex-1 bg-transparent text-[30px] font-bold tracking-tight text-[#3c3c3c] outline-none placeholder:text-[#777] invalid:text-[#b3261e]\" />{value && }

{keys.map((key) => )}

;\n}\n\ntype QuizSession = { config: Config; ion: Ion; index: number; pool: Ion[]; formula: string; charge: string; checked: boolean; answerCorrect: boolean; progress: number; attempts: number; correct: number; streak: number; timeLeft: number | null; setFormula: (value: string) => void; setCharge: (value: string) => void; submit: () => void; skip: () => void; end: () => void };\n\nexport function QuizScreen({ session }: { session: QuizSession }) {\n const [confirmEnd, setConfirmEnd] = useState(false);\n return

{session.config.seconds !== null && <>{Math.floor((session.timeLeft ?? 0) / 60)}:{String((session.timeLeft ?? 0) % 60).padStart(2, \"0\")}}{session.streak}

{session.ion.name}

session.setFormula(session.formula + v)} onClear={() => session.setFormula(\"\")} /> session.setCharge(session.charge + v)} onClear={() => session.setCharge(\"\")} />

{session.checked && !session.answerCorrect &&

Not quite. Try again.

}{session.checked && session.answerCorrect &&

Correct! {formatFormula(session.ion.formula)} {formatCharge(session.ion.charge)}

}

{session.attempts} attempts•{session.attempts ? Math.round(session.correct / session.attempts * 100) : 0}% accuracy•{session.correct} correct{!session.config.loop && <>•{Math.min(session.index + 1, session.pool.length)}/{session.pool.length}}

{confirmEnd &&

{ if (e.target === e.currentTarget) setConfirmEnd(false); }}>

End session?

Your current progress will be included in the results.

}

;\n}\n","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport React, { useRef, useState } from \"https://esm.sh/react@18.2.0\";\nimport { Clock3, Flame, X } from \"https://esm.sh/lucide-react@0.468.0?deps=react@18.2.0,react-dom@18.2.0\";\nimport { CHARGE_PATTERN, FORMULA_PATTERN, formatCharge, formatFormula } from \"../lib/quiz.ts\";\nimport type { Config, Ion } from \"../lib/polyatomics.ts\";\n\nfunction FormulaInput({ value, onChange, onInsert, onClear, charge = false }: { value: string; onChange: (v: string) => void; onInsert: (v: string) => void; onClear: () => void; charge?: boolean }) {\n const inputRef = useRef(null);\n const keys = charge ? [\"+\", \"−\"] : [\"₂\", \"₃\", \"₄\", \"₅\", \"₆\", \"₇\", \"₈\", \"₉\"];\n return

{keys.map((key) => )}

;\n}\n\ntype QuizSession = { config: Config; ion: Ion; index: number; pool: Ion[]; formula: string; charge: string; checked: boolean; gaveUp: boolean; correctAnimating: boolean; answerCorrect: boolean; progress: number; attempts: number; correct: number; streak: number; timeLeft: number | null; setFormula: (value: string) => void; setCharge: (value: string) => void; submit: () => void; skip: () => void; giveUp: () => void; continueAfterGiveUp: () => void; end: () => void };\n\nexport function QuizScreen({ session }: { session: QuizSession }) {\n const [confirmEnd, setConfirmEnd] = useState(false);\n return

{session.config.seconds !== null && <>{Math.floor((session.timeLeft ?? 0) / 60)}:{String((session.timeLeft ?? 0) % 60).padStart(2, \"0\")}}{session.streak}

{session.ion.name}

session.setFormula(session.formula + v)} onClear={() => session.setFormula(\"\")} /> session.setCharge(session.charge + v)} onClear={() => session.setCharge(\"\")} />

{session.checked && !session.answerCorrect &&

Not quite. Try again.

}{session.checked && session.answerCorrect &&

Correct! {formatFormula(session.ion.formula)} {formatCharge(session.ion.charge)}

}

{confirmEnd &&

{ if (e.target === e.currentTarget) setConfirmEnd(false); }}>

End session?

Your current progress will be included in the results.

}

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Date.now());\n const script = `const VERSION = ${JSON.stringify(version)};\nconst CACHE = \"polyatomics-v\" + VERSION;\nconst SHELL = [\"/\"];\nlet hadPreviousCache = false;\nself.addEventListener(\"install\", (event) => {\n event.waitUntil(\n caches.keys()\n .then((keys) => {\n hadPreviousCache = keys.some((key) => key.startsWith(\"polyatomics-v\"));\n return caches.open(CACHE);\n })\n .then((cache) => cache.addAll(SHELL))\n .then(() => self.skipWaiting())\n );\n});\nself.addEventListener(\"activate\", (event) => {\n event.waitUntil(\n caches.keys()\n .then((keys) => Promise.all(keys.filter((key) => key.startsWith(\"polyatomics-v\") && key !== CACHE).map((key) => caches.delete(key))))\n .then(() => self.clients.claim())\n .then(() => hadPreviousCache ? self.clients.matchAll({ type: \"window\", includeUncontrolled: true }).then((clients) => clients.forEach((client) => client.postMessage({ type: \"UPDATE_AVAILABLE\", version: VERSION }))) : undefined)\n );\n});\nself.addEventListener(\"fetch\", (event) => {\n const request = event.request;\n if (request.method !== \"GET\") return;\n event.respondWith(\n caches.match(request)\n .then((cached) => cached || fetch(request).then((response) => {\n if (response.ok || response.type === \"opaque\") {\n const copy = response.clone();\n caches.open(CACHE).then((cache) => cache.put(request, copy));\n }\n return response;\n }).catch(() => request.mode === \"navigate\" ? caches.match(\"/\") : new Response(\"Offline\", { status: 503, statusText: \"Offline\" })))\n );\n});`;\n return c.body(script, 200, { \"Content-Type\": \"application/javascript; charset=UTF-8\", \"Cache-Control\": \"no-cache\" });\n});\napp.get(\"/__immutable/*\", (c) => serveImmutableFile(c.req.path));\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\napp.onError((err) => Promise.reject(err));\n\nexport default app.fetch;\n","label",[136],"8fd05197-c6e3-4b8e-b16a-e383aca59d99","README.md","01a04b7f-e043-776f-9b1e-61c237442125",146,["D",1788025063496],1,"# Polyatomics\n\nA focused practice app for memorizing common polyatomic ion formulas and charges.\n\n## Features\n\n- Practice 32 common polyatomic ions.\n- Choose a time limit or practice without a timer.\n- Practice by category or select individual ions.\n- Loop mode continuously cycles through the selected pool.\n- Immediate feedback shows the correct formula and charge.\n- Session results include accuracy, correct answers, average answer time, and missed ions.\n- Installable as a PWA with update notifications.\n\n## Architecture\n\n```mermaid\ngraph LR\n Browser -->|GET /| Hono[\"index.ts\"]\n Hono -->|HTML shell| Root[\"frontend/root.tsx\"]\n Root --> Entry[\"frontend/index.tsx\"]\n Entry --> App[\"frontend/components/App.tsx\"]\n App --> Start[\"StartScreen.tsx\"]\n App --> Quiz[\"QuizScreen.tsx\"]\n App --> End[\"EndScreen.tsx\"]\n App --> Install[\"InstallNudge.tsx\"]\n App --> Session[\"hooks/useQuizSession.ts\"]\n Session --> Rules[\"lib/quiz.ts\"]\n Rules --> Data[\"lib/polyatomics.ts\"]\n```\n\n## File structure\n\n```text\nindex.ts\nfrontend/\n root.tsx # HTML shell and immutable asset URLs\n index.tsx # React entrypoint and service-worker registration\n manifest.webmanifest # PWA metadata\n favicon.svg # App icon\n favicon-green.svg # App icon used by the shell\n icon-192.svg\n icon-512.svg\n components/\n App.tsx # Composition/root component\n StartScreen.tsx # Session configuration\n QuizScreen.tsx # Question and answer UI\n EndScreen.tsx # Session results\n InstallNudge.tsx # Install/update UI\n hooks/\n useQuizSession.ts # Quiz state and transitions\n lib/\n polyatomics.ts # Ion data, types, and defaults\n quiz.ts # Pure quiz rules and formatting helpers\n```\n\n## Design principles\n\nThe UI components are intentionally thin. Quiz behavior lives in `useQuizSession`, while pure domain rules live in `lib/quiz.ts`. The ion dataset and shared types live in `lib/polyatomics.ts`, so other practice modes can reuse them without depending on the UI.\n\nThe app does not require application cookies or a login to practice. Browser persistence for the install prompt is treated as optional: if web storage is unavailable or blocked, the prompt simply falls back to its default behavior and the quiz remains usable.\n\n## Development\n\nThe HTTP entrypoint is `index.ts`. React components live under `frontend/components/`, with reusable state and domain logic under `frontend/hooks/` and `frontend/lib/`.\n\nThe app uses React 18, Hono, Twind, and immutable Val Town asset URLs.\n",[147],"aa37af58-90fd-4bfa-85a4-500c985f1deb","frontend","01a04b7f-e043-776f-9b1e-58a885ba27e3",["D",1787973066715],"directory",[155],"pulls","branches","forks","envVars",{"_167":64,"_169":64},"connections",{"_167":64,"_168":64},"count","unfilledCount","emptyCount",{"_44":154,"_32":155,"_30":156,"_137":-5,"_42":43,"_41":151,"_139":60,"_39":329,"_13":64,"_34":158,"_36":-5,"_24":25,"_144":-5,"_192":330,"_27":331},{"_44":325,"_32":298,"_30":293,"_137":156,"_42":43,"_41":151,"_139":60,"_39":326,"_13":64,"_34":158,"_36":-5,"_24":25,"_144":-5,"_192":327,"_27":328},{"_44":317,"_32":318,"_30":319,"_137":293,"_42":43,"_41":258,"_139":25,"_39":320,"_13":321,"_34":35,"_36":322,"_24":25,"_144":-5,"_192":323,"_27":324},{"_44":310,"_32":311,"_30":312,"_137":293,"_42":43,"_41":258,"_139":25,"_39":313,"_13":64,"_34":35,"_36":314,"_24":25,"_144":-5,"_192":315,"_27":316},{"_44":303,"_32":304,"_30":305,"_137":293,"_42":43,"_41":149,"_139":25,"_39":306,"_13":151,"_34":35,"_36":307,"_24":25,"_144":-5,"_192":308,"_27":309},{"_44":299,"_32":33,"_30":31,"_137":293,"_42":43,"_41":14,"_139":25,"_39":300,"_13":151,"_34":35,"_36":38,"_24":25,"_144":-5,"_192":301,"_27":302},{"_44":290,"_32":291,"_30":292,"_137":293,"_42":43,"_41":258,"_139":25,"_39":294,"_13":64,"_34":35,"_36":295,"_24":25,"_144":-5,"_192":296,"_27":297},{"_44":286,"_32":285,"_30":278,"_137":156,"_42":43,"_41":258,"_139":60,"_39":287,"_13":64,"_34":158,"_36":-5,"_24":25,"_144":-5,"_192":288,"_27":289},{"_44":275,"_32":276,"_30":277,"_137":278,"_42":43,"_41":279,"_139":25,"_39":280,"_13":281,"_34":35,"_36":282,"_24":25,"_144":-5,"_192":283,"_27":284},{"_44":271,"_32":263,"_30":257,"_137":156,"_42":43,"_41":258,"_139":60,"_39":272,"_13":64,"_34":158,"_36":-5,"_24":25,"_144":-5,"_192":273,"_27":274},{"_44":264,"_32":265,"_30":266,"_137":257,"_42":43,"_41":258,"_139":25,"_39":267,"_13":64,"_34":35,"_36":268,"_24":25,"_144":-5,"_192":269,"_27":270},{"_44":254,"_32":255,"_30":256,"_137":257,"_42":43,"_41":258,"_139":25,"_39":259,"_13":64,"_34":35,"_36":260,"_24":25,"_144":-5,"_192":261,"_27":262},{"_44":246,"_32":247,"_30":248,"_137":156,"_42":43,"_41":249,"_139":60,"_39":250,"_13":151,"_34":20,"_36":251,"_24":25,"_144":-5,"_192":252,"_27":253},{"_44":239,"_32":240,"_30":241,"_137":156,"_42":43,"_41":151,"_139":60,"_39":242,"_13":64,"_34":20,"_36":243,"_24":25,"_144":-5,"_192":244,"_27":245},{"_44":231,"_32":232,"_30":233,"_137":156,"_42":43,"_41":234,"_139":25,"_39":235,"_13":151,"_34":20,"_36":236,"_24":25,"_144":-5,"_192":237,"_27":238},{"_44":223,"_32":224,"_30":225,"_137":156,"_42":43,"_41":226,"_139":25,"_39":227,"_13":151,"_34":20,"_36":228,"_24":25,"_144":-5,"_192":229,"_27":230},{"_44":215,"_32":216,"_30":217,"_137":156,"_42":43,"_41":218,"_139":25,"_39":219,"_13":151,"_34":35,"_36":220,"_24":25,"_144":-5,"_192":221,"_27":222},{"_44":207,"_32":208,"_30":209,"_137":156,"_42":43,"_41":210,"_139":25,"_39":211,"_13":64,"_34":20,"_36":212,"_24":25,"_144":-5,"_192":213,"_27":214},{"_44":198,"_32":199,"_30":200,"_137":156,"_42":43,"_41":201,"_139":25,"_39":202,"_13":203,"_34":35,"_36":204,"_24":25,"_144":-5,"_192":205,"_27":206},{"_44":146,"_32":147,"_30":148,"_137":-5,"_42":43,"_41":149,"_139":60,"_39":195,"_13":151,"_34":20,"_36":152,"_24":25,"_144":-5,"_192":196,"_27":197},{"_44":135,"_32":136,"_30":58,"_137":-5,"_42":43,"_41":138,"_139":25,"_39":191,"_13":141,"_34":142,"_36":143,"_24":25,"_144":46,"_192":193,"_27":194},["D",1787984765894],"children",[],[136],["D",1788025063496],[],[147],"129e6d74-e1f0-4e84-b682-966130957ed5","root.tsx","01a04b7f-e043-776f-9b1e-554f5bc7b179",106,["D",1787983391924],13,"/** @jsxImportSource npm:hono@4/jsx */\nimport { raw } from \"npm:hono@4/html\";\nimport { immutableFileUrl } from \"https://esm.town/v/std/utils/index.ts\";\n\nexport function Root() {\n return (\n <>\n {raw(\"\")}\n \n \n \n \n \n \n \n \n \n \n \n Polyatomics\n \n \n

Diff · v154