From d70a3a4a20a28973ebe451cea438a789ea5b44c8 Mon Sep 17 00:00:00 2001 From: rkrfld Date: Tue, 18 Aug 2026 21:40:57 +0700 Subject: [PATCH 1/6] feat(problem1): implement three sum_to_n variants Add sum_to_n.js with three implementations: iterative loop (O(n)), Gauss formula (O(1)), and recursion (O(n) time/space). All verified to agree on n = 0, 1, 5, 100. --- src/problem1/sum_to_n.js | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 src/problem1/sum_to_n.js diff --git a/src/problem1/sum_to_n.js b/src/problem1/sum_to_n.js new file mode 100644 index 0000000000..560211f268 --- /dev/null +++ b/src/problem1/sum_to_n.js @@ -0,0 +1,21 @@ +// Three unique implementations of sum_to_n(n) = 1 + 2 + ... + n + +// a) Iterative loop — O(n) time, O(1) space +function sum_to_n_a(n) { + let sum = 0; + for (let i = 1; i <= n; i++) sum += i; + return sum; +} + +// b) Mathematical formula (Gauss sum) — O(1) time, O(1) space +function sum_to_n_b(n) { + return (n * (n + 1)) / 2; +} + +// c) Recursive — O(n) time, O(n) space (call stack) +function sum_to_n_c(n) { + if (n <= 0) return 0; + return n + sum_to_n_c(n - 1); +} + +module.exports = { sum_to_n_a, sum_to_n_b, sum_to_n_c }; From 37ae4e703ad893e5c1288f70f65da59c458ff2bd Mon Sep 17 00:00:00 2001 From: rkrfld Date: Tue, 18 Aug 2026 21:54:39 +0700 Subject: [PATCH 2/6] feat(problem2): build currency swap form with Vite + React + TS Fetches live prices from interview.switcheo.com, dedupes by latest date, renders searchable token dropdowns with Switcheo icons (fallback on 404), computes live swap output, validates same-token/invalid-amount, mocks submit with a loading delay. --- src/problem2/.gitignore | 24 + src/problem2/.oxlintrc.json | 8 + src/problem2/README.md | 32 + src/problem2/index.html | 38 +- src/problem2/package-lock.json | 1273 ++++++++++++++++++++++++++++++ src/problem2/package.json | 25 + src/problem2/public/favicon.svg | 1 + src/problem2/public/icons.svg | 24 + src/problem2/script.js | 0 src/problem2/src/App.css | 255 ++++++ src/problem2/src/App.tsx | 12 + src/problem2/src/SwapForm.tsx | 125 +++ src/problem2/src/TokenIcon.tsx | 23 + src/problem2/src/TokenSelect.tsx | 87 ++ src/problem2/src/index.css | 14 + src/problem2/src/main.tsx | 10 + src/problem2/src/tokenIconUrl.ts | 3 + src/problem2/src/types.ts | 4 + src/problem2/src/usePrices.ts | 56 ++ src/problem2/style.css | 8 - src/problem2/tsconfig.app.json | 26 + src/problem2/tsconfig.json | 7 + src/problem2/tsconfig.node.json | 23 + src/problem2/vite.config.ts | 7 + 24 files changed, 2051 insertions(+), 34 deletions(-) create mode 100644 src/problem2/.gitignore create mode 100644 src/problem2/.oxlintrc.json create mode 100644 src/problem2/README.md create mode 100644 src/problem2/package-lock.json create mode 100644 src/problem2/package.json create mode 100644 src/problem2/public/favicon.svg create mode 100644 src/problem2/public/icons.svg delete mode 100644 src/problem2/script.js create mode 100644 src/problem2/src/App.css create mode 100644 src/problem2/src/App.tsx create mode 100644 src/problem2/src/SwapForm.tsx create mode 100644 src/problem2/src/TokenIcon.tsx create mode 100644 src/problem2/src/TokenSelect.tsx create mode 100644 src/problem2/src/index.css create mode 100644 src/problem2/src/main.tsx create mode 100644 src/problem2/src/tokenIconUrl.ts create mode 100644 src/problem2/src/types.ts create mode 100644 src/problem2/src/usePrices.ts delete mode 100644 src/problem2/style.css create mode 100644 src/problem2/tsconfig.app.json create mode 100644 src/problem2/tsconfig.json create mode 100644 src/problem2/tsconfig.node.json create mode 100644 src/problem2/vite.config.ts diff --git a/src/problem2/.gitignore b/src/problem2/.gitignore new file mode 100644 index 0000000000..a547bf36d8 --- /dev/null +++ b/src/problem2/.gitignore @@ -0,0 +1,24 @@ +# Logs +logs +*.log +npm-debug.log* +yarn-debug.log* +yarn-error.log* +pnpm-debug.log* +lerna-debug.log* + +node_modules +dist +dist-ssr +*.local + +# Editor directories and files +.vscode/* +!.vscode/extensions.json +.idea +.DS_Store +*.suo +*.ntvs* +*.njsproj +*.sln +*.sw? diff --git a/src/problem2/.oxlintrc.json b/src/problem2/.oxlintrc.json new file mode 100644 index 0000000000..6fa991dad2 --- /dev/null +++ b/src/problem2/.oxlintrc.json @@ -0,0 +1,8 @@ +{ + "$schema": "./node_modules/oxlint/configuration_schema.json", + "plugins": ["react", "typescript", "oxc"], + "rules": { + "react/rules-of-hooks": "error", + "react/only-export-components": ["warn", { "allowConstantExport": true }] + } +} diff --git a/src/problem2/README.md b/src/problem2/README.md new file mode 100644 index 0000000000..d6af7e39ff --- /dev/null +++ b/src/problem2/README.md @@ -0,0 +1,32 @@ +# React + TypeScript + Vite + +This template provides a minimal setup to get React working in Vite with HMR and some Oxlint rules. + +Currently, two official plugins are available: + +- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react) uses [Oxc](https://oxc.rs) +- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/) + +## React Compiler + +The React Compiler is not enabled on this template because of its impact on dev & build performances. To add it, see [this documentation](https://react.dev/learn/react-compiler/installation). + +## Expanding the Oxlint configuration + +If you are developing a production application, we recommend enabling type-aware lint rules by installing `oxlint-tsgolint` and editing `.oxlintrc.json`: + +```json +{ + "$schema": "./node_modules/oxlint/configuration_schema.json", + "plugins": ["react", "typescript", "oxc"], + "options": { + "typeAware": true + }, + "rules": { + "react/rules-of-hooks": "error", + "react/only-export-components": ["warn", { "allowConstantExport": true }] + } +} +``` + +See the [Oxlint rules documentation](https://oxc.rs/docs/guide/usage/linter/rules) for the full list of rules and categories. diff --git a/src/problem2/index.html b/src/problem2/index.html index 4058a68bff..a377b6961e 100644 --- a/src/problem2/index.html +++ b/src/problem2/index.html @@ -1,27 +1,13 @@ - - - - - Fancy Form - - - - - - - - -
-
Swap
- - - - - - - -
- - - + + + + + + + Fancy Form — Currency Swap + + +
+ + diff --git a/src/problem2/package-lock.json b/src/problem2/package-lock.json new file mode 100644 index 0000000000..4d0578f63f --- /dev/null +++ b/src/problem2/package-lock.json @@ -0,0 +1,1273 @@ +{ + "name": "problem2", + "version": "0.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "problem2", + "version": "0.0.0", + "dependencies": { + "react": "^19.2.8", + "react-dom": "^19.2.8" + }, + "devDependencies": { + "@types/node": "^24.13.3", + "@types/react": "^19.2.17", + "@types/react-dom": "^19.2.3", + "@vitejs/plugin-react": "^6.0.4", + "oxlint": "^1.75.0", + "typescript": "~6.0.2", + "vite": "^8.2.0" + } + }, + "node_modules/@oxc-project/types": { + "version": "0.144.0", + "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.144.0.tgz", + "integrity": "sha512-nuhZIOLuI6TFQ32I/WnUx+SCPY7SdSKwgnFHydAuoS1+Z4BRcaP+RRJmGzl9lw+0OFF7UmaESf7KQRXaNLHypg==", + "dev": true, + "license": "MIT", + "funding": { + "url": 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"dev": "vite", + "build": "tsc -b && vite build", + "lint": "oxlint", + "preview": "vite preview" + }, + "dependencies": { + "react": "^19.2.8", + "react-dom": "^19.2.8" + }, + "devDependencies": { + "@types/node": "^24.13.3", + "@types/react": "^19.2.17", + "@types/react-dom": "^19.2.3", + "@vitejs/plugin-react": "^6.0.4", + "oxlint": "^1.75.0", + "typescript": "~6.0.2", + "vite": "^8.2.0" + } +} diff --git a/src/problem2/public/favicon.svg b/src/problem2/public/favicon.svg new file mode 100644 index 0000000000..6893eb1323 --- /dev/null +++ b/src/problem2/public/favicon.svg @@ -0,0 +1 @@ + \ No newline at end of file diff --git a/src/problem2/public/icons.svg b/src/problem2/public/icons.svg new file mode 100644 index 0000000000..e9522193d9 --- /dev/null +++ b/src/problem2/public/icons.svg @@ -0,0 +1,24 @@ + + + + + + + + + + + + + + + + + + + + + + + + diff --git a/src/problem2/script.js b/src/problem2/script.js deleted file mode 100644 index e69de29bb2..0000000000 diff --git a/src/problem2/src/App.css b/src/problem2/src/App.css new file mode 100644 index 0000000000..3764583b8c --- /dev/null +++ b/src/problem2/src/App.css @@ -0,0 +1,255 @@ +.app-bg { + min-height: 100vh; + display: flex; + align-items: center; + justify-content: center; + padding: 24px; + background: radial-gradient(circle at top, #4338ca 0%, #1e1b4b 60%, #0b0a1f 100%); +} + +.swap-card { + width: 100%; + max-width: 420px; + background: #17162e; + border: 1px solid rgba(255, 255, 255, 0.08); + border-radius: 20px; + padding: 28px; + box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4); + color: #f4f4f8; +} + +.swap-card h1 { + margin: 0 0 20px; + font-size: 20px; + font-weight: 600; +} + +.swap-label { + display: block; + font-size: 12px; + color: #9490b8; + margin-bottom: 6px; +} + +.swap-row { + display: flex; + align-items: center; + gap: 8px; + background: #201f3c; + border: 1px solid rgba(255, 255, 255, 0.06); + border-radius: 14px; + padding: 12px 14px; +} + +.swap-amount-input { + flex: 1; + min-width: 0; + background: transparent; + border: none; + outline: none; + color: #f4f4f8; + font-size: 22px; + font-weight: 500; +} + +.swap-amount-input::-webkit-outer-spin-button, +.swap-amount-input::-webkit-inner-spin-button { + -webkit-appearance: none; + margin: 0; +} + +.swap-amount-input[type='number'] { + -moz-appearance: textfield; +} + +.swap-amount-input::placeholder { + color: #55517c; +} + +.swap-direction { + display: block; + margin: 14px auto 8px; + width: 36px; + height: 36px; + border-radius: 10px; + border: 1px solid rgba(255, 255, 255, 0.08); + background: #201f3c; + color: #f4f4f8; + font-size: 16px; + cursor: pointer; + transition: transform 0.15s ease, background 0.15s ease; +} + +.swap-direction:hover:not(:disabled) { + background: #2c2a52; + transform: rotate(180deg); +} + +.swap-direction:disabled { + opacity: 0.4; + cursor: not-allowed; +} + +.swap-error { + color: #ff8a8a; + font-size: 13px; + margin: 10px 0 0; +} + +.swap-success { + color: #b7f3c9; + font-size: 14px; + margin-bottom: 20px; +} + +.swap-submit { + width: 100%; + margin-top: 18px; + padding: 14px; + border: none; + border-radius: 14px; + background: linear-gradient(135deg, #6366f1, #8b5cf6); + color: #fff; + font-size: 15px; + font-weight: 600; + letter-spacing: 0.02em; + cursor: pointer; + transition: opacity 0.15s ease, transform 0.1s ease; +} + +.swap-submit:disabled { + opacity: 0.4; + cursor: not-allowed; +} + +.swap-submit:not(:disabled):hover { + transform: translateY(-1px); +} + +.swap-card--loading { + display: flex; + align-items: center; + justify-content: center; + min-height: 200px; + color: #cfcbe8; +} + +/* --- token select --- */ + +.token-select { + position: relative; + flex-shrink: 0; +} + +.token-select__trigger { + display: flex; + align-items: center; + gap: 6px; + background: #2c2a52; + border: none; + border-radius: 999px; + padding: 8px 12px; + color: #f4f4f8; + font-size: 14px; + font-weight: 600; + cursor: pointer; + white-space: nowrap; +} + +.token-select__trigger:hover { + background: #37356a; +} + +.token-select__placeholder { + color: #cfcbe8; + font-weight: 500; +} + +.token-select__chevron { + font-size: 10px; + color: #9490b8; +} + +.token-select__panel { + position: absolute; + top: calc(100% + 8px); + right: 0; + width: 260px; + max-height: 320px; + background: #201f3c; + border: 1px solid rgba(255, 255, 255, 0.1); + border-radius: 14px; + box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5); + z-index: 10; + display: flex; + flex-direction: column; + overflow: hidden; +} + +.token-select__search { + margin: 10px; + padding: 8px 10px; + border-radius: 10px; + border: 1px solid rgba(255, 255, 255, 0.1); + background: #17162e; + color: #f4f4f8; + outline: none; + font-size: 13px; +} + +.token-select__list { + list-style: none; + margin: 0; + padding: 0 6px 6px; + overflow-y: auto; +} + +.token-select__option { + width: 100%; + display: flex; + align-items: center; + gap: 8px; + background: none; + border: none; + color: #f4f4f8; + padding: 8px; + border-radius: 10px; + cursor: pointer; + font-size: 14px; + text-align: left; +} + +.token-select__option:hover { + background: #2c2a52; +} + +.token-select__price { + margin-left: auto; + color: #9490b8; + font-size: 12px; +} + +.token-select__empty { + padding: 12px; + text-align: center; + color: #9490b8; + font-size: 13px; +} + +.token-icon, +.token-icon--fallback { + width: 22px; + height: 22px; + border-radius: 50%; + flex-shrink: 0; +} + +.token-icon--fallback { + display: flex; + align-items: center; + justify-content: center; + background: #4338ca; + color: #fff; + font-size: 11px; + font-weight: 700; +} diff --git a/src/problem2/src/App.tsx b/src/problem2/src/App.tsx new file mode 100644 index 0000000000..342b826e4a --- /dev/null +++ b/src/problem2/src/App.tsx @@ -0,0 +1,12 @@ +import './App.css'; +import { SwapForm } from './SwapForm'; + +function App() { + return ( +
+ +
+ ); +} + +export default App; diff --git a/src/problem2/src/SwapForm.tsx b/src/problem2/src/SwapForm.tsx new file mode 100644 index 0000000000..6cec6269ca --- /dev/null +++ b/src/problem2/src/SwapForm.tsx @@ -0,0 +1,125 @@ +import { useMemo, useState } from 'react'; +import { usePrices } from './usePrices'; +import { TokenSelect } from './TokenSelect'; +import type { Token } from './types'; + +type Status = 'idle' | 'submitting' | 'success'; + +export function SwapForm() { + const { tokens, loading, error } = usePrices(); + const [fromToken, setFromToken] = useState(null); + const [toToken, setToToken] = useState(null); + const [amount, setAmount] = useState(''); + const [status, setStatus] = useState('idle'); + + const amountNumber = Number(amount); + const amountValid = amount.trim() !== '' && Number.isFinite(amountNumber) && amountNumber > 0; + + const formError = useMemo(() => { + if (!fromToken || !toToken) return null; + if (fromToken.symbol === toToken.symbol) return 'Choose two different tokens'; + if (amount.trim() !== '' && !amountValid) return 'Enter a valid positive amount'; + return null; + }, [fromToken, toToken, amount, amountValid]); + + const canSubmit = + !!fromToken && !!toToken && amountValid && !formError && status !== 'submitting'; + + const receiveAmount = + fromToken && toToken && amountValid + ? (amountNumber * fromToken.price) / toToken.price + : null; + + function swapDirection() { + setFromToken(toToken); + setToToken(fromToken); + } + + function handleSubmit(e: React.FormEvent) { + e.preventDefault(); + if (!canSubmit) return; + setStatus('submitting'); + setTimeout(() => { + setStatus('success'); + }, 1200); + } + + if (loading) return
Loading tokens…
; + if (error) return
Failed to load prices: {error}
; + + if (status === 'success') { + return ( +
+

Swap complete

+

+ Swapped {amount} {fromToken?.symbol} for {receiveAmount?.toFixed(6)} {toToken?.symbol} +

+ +
+ ); + } + + return ( +
+

Swap

+ + +
+ setAmount(e.target.value)} + /> + +
+ + + + +
+ + +
+ + {formError &&

{formError}

} + + +
+ ); +} diff --git a/src/problem2/src/TokenIcon.tsx b/src/problem2/src/TokenIcon.tsx new file mode 100644 index 0000000000..dc7836d2fb --- /dev/null +++ b/src/problem2/src/TokenIcon.tsx @@ -0,0 +1,23 @@ +import { useState } from 'react'; +import { tokenIconUrl } from './tokenIconUrl'; + +export function TokenIcon({ symbol }: { symbol: string }) { + const [failed, setFailed] = useState(false); + + if (failed) { + return ( + + ); + } + + return ( + {symbol} setFailed(true)} + /> + ); +} diff --git a/src/problem2/src/TokenSelect.tsx b/src/problem2/src/TokenSelect.tsx new file mode 100644 index 0000000000..929fa23b74 --- /dev/null +++ b/src/problem2/src/TokenSelect.tsx @@ -0,0 +1,87 @@ +import { useEffect, useRef, useState } from 'react'; +import type { Token } from './types'; +import { TokenIcon } from './TokenIcon'; + +interface Props { + tokens: Token[]; + value: Token | null; + onChange: (token: Token) => void; + label: string; +} + +export function TokenSelect({ tokens, value, onChange, label }: Props) { + const [open, setOpen] = useState(false); + const [query, setQuery] = useState(''); + const rootRef = useRef(null); + + useEffect(() => { + function onClickOutside(e: MouseEvent) { + if (rootRef.current && !rootRef.current.contains(e.target as Node)) { + setOpen(false); + } + } + document.addEventListener('mousedown', onClickOutside); + return () => document.removeEventListener('mousedown', onClickOutside); + }, []); + + const filtered = tokens.filter((t) => + t.symbol.toLowerCase().includes(query.toLowerCase()) + ); + + return ( +
+ + + {open && ( +
+ setQuery(e.target.value)} + /> +
    + {filtered.length === 0 && ( +
  • No tokens found
    • + )} + {filtered.map((token) => ( +
  • + +
    • + ))} +
+
+ )} +
+ ); +} diff --git a/src/problem2/src/index.css b/src/problem2/src/index.css new file mode 100644 index 0000000000..db8e20aca7 --- /dev/null +++ b/src/problem2/src/index.css @@ -0,0 +1,14 @@ +:root { + color-scheme: light dark; + font-family: 'Inter', system-ui, Arial, Helvetica, sans-serif; +} + +* { + box-sizing: border-box; +} + +body { + margin: 0; + min-width: 360px; + min-height: 100vh; +} diff --git a/src/problem2/src/main.tsx b/src/problem2/src/main.tsx new file mode 100644 index 0000000000..bef5202a32 --- /dev/null +++ b/src/problem2/src/main.tsx @@ -0,0 +1,10 @@ +import { StrictMode } from 'react' +import { createRoot } from 'react-dom/client' +import './index.css' +import App from './App.tsx' + +createRoot(document.getElementById('root')!).render( + + + , +) diff --git a/src/problem2/src/tokenIconUrl.ts b/src/problem2/src/tokenIconUrl.ts new file mode 100644 index 0000000000..9c88b3ed49 --- /dev/null +++ b/src/problem2/src/tokenIconUrl.ts @@ -0,0 +1,3 @@ +export function tokenIconUrl(symbol: string) { + return `https://raw.githubusercontent.com/Switcheo/token-icons/main/tokens/${symbol}.svg`; +} diff --git a/src/problem2/src/types.ts b/src/problem2/src/types.ts new file mode 100644 index 0000000000..e539f4b3e1 --- /dev/null +++ b/src/problem2/src/types.ts @@ -0,0 +1,4 @@ +export interface Token { + symbol: string; + price: number; +} diff --git a/src/problem2/src/usePrices.ts b/src/problem2/src/usePrices.ts new file mode 100644 index 0000000000..ccab79e11b --- /dev/null +++ b/src/problem2/src/usePrices.ts @@ -0,0 +1,56 @@ +import { useEffect, useState } from 'react'; +import type { Token } from './types'; + +const PRICES_URL = 'https://interview.switcheo.com/prices.json'; + +interface RawPrice { + currency: string; + date: string; + price: number; +} + +export function usePrices() { + const [tokens, setTokens] = useState([]); + const [loading, setLoading] = useState(true); + const [error, setError] = useState(null); + + useEffect(() => { + let cancelled = false; + + fetch(PRICES_URL) + .then((res) => { + if (!res.ok) throw new Error(`Failed to load prices (${res.status})`); + return res.json() as Promise; + }) + .then((raw) => { + if (cancelled) return; + + const latestByCurrency = new Map(); + for (const entry of raw) { + const existing = latestByCurrency.get(entry.currency); + if (!existing || new Date(entry.date) > new Date(existing.date)) { + latestByCurrency.set(entry.currency, entry); + } + } + + const list = Array.from(latestByCurrency.values()) + .filter((entry) => entry.price > 0) + .map((entry) => ({ symbol: entry.currency, price: entry.price })) + .sort((a, b) => a.symbol.localeCompare(b.symbol)); + + setTokens(list); + setLoading(false); + }) + .catch((err) => { + if (cancelled) return; + setError(err instanceof Error ? err.message : 'Failed to load prices'); + setLoading(false); + }); + + return () => { + cancelled = true; + }; + }, []); + + return { tokens, loading, error }; +} diff --git a/src/problem2/style.css b/src/problem2/style.css deleted file mode 100644 index 915af91c72..0000000000 --- a/src/problem2/style.css +++ /dev/null @@ -1,8 +0,0 @@ -body { - display: flex; - flex-direction: row; - align-items: center; - justify-content: center; - min-width: 360px; - font-family: Arial, Helvetica, sans-serif; -} diff --git a/src/problem2/tsconfig.app.json b/src/problem2/tsconfig.app.json new file mode 100644 index 0000000000..6830b6f759 --- /dev/null +++ b/src/problem2/tsconfig.app.json @@ -0,0 +1,26 @@ +{ + "compilerOptions": { + "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo", + "target": "es2023", + "lib": ["ES2023", "DOM"], + "module": "esnext", + "types": ["vite/client"], + "allowArbitraryExtensions": true, + "skipLibCheck": true, + + /* Bundler mode */ + "moduleResolution": "bundler", + "allowImportingTsExtensions": true, + "verbatimModuleSyntax": true, + "moduleDetection": "force", + "noEmit": true, + "jsx": "react-jsx", + + /* Linting */ + "noUnusedLocals": true, + "noUnusedParameters": true, + "erasableSyntaxOnly": true, + "noFallthroughCasesInSwitch": true + }, + "include": ["src"] +} diff --git a/src/problem2/tsconfig.json b/src/problem2/tsconfig.json new file mode 100644 index 0000000000..1ffef600d9 --- /dev/null +++ b/src/problem2/tsconfig.json @@ -0,0 +1,7 @@ +{ + "files": [], + "references": [ + { "path": "./tsconfig.app.json" }, + { "path": "./tsconfig.node.json" } + ] +} diff --git a/src/problem2/tsconfig.node.json b/src/problem2/tsconfig.node.json new file mode 100644 index 0000000000..8455dcbc2c --- /dev/null +++ b/src/problem2/tsconfig.node.json @@ -0,0 +1,23 @@ +{ + "compilerOptions": { + "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo", + "target": "es2023", + "lib": ["ES2023"], + "types": ["node"], + "skipLibCheck": true, + + /* Bundler mode */ + "module": "nodenext", + "allowImportingTsExtensions": true, + "verbatimModuleSyntax": true, + "moduleDetection": "force", + "noEmit": true, + + /* Linting */ + "noUnusedLocals": true, + "noUnusedParameters": true, + "erasableSyntaxOnly": true, + "noFallthroughCasesInSwitch": true + }, + "include": ["vite.config.ts"] +} diff --git a/src/problem2/vite.config.ts b/src/problem2/vite.config.ts new file mode 100644 index 0000000000..8b0f57b91a --- /dev/null +++ b/src/problem2/vite.config.ts @@ -0,0 +1,7 @@ +import { defineConfig } from 'vite' +import react from '@vitejs/plugin-react' + +// https://vite.dev/config/ +export default defineConfig({ + plugins: [react()], +}) From 102b2dd7b4733aa3d87f7c70fc87fe160ded0585 Mon Sep 17 00:00:00 2001 From: rkrfld Date: Tue, 18 Aug 2026 21:57:14 +0700 Subject: [PATCH 3/6] docs(problem3): identify and fix messy React anti-patterns List 11 issues (undefined var, inverted filter, missing blockchain type, bad sort comparator, wasted useMemo deps, dead formattedBalances, index-as-key, dropped children) with a refactored WalletPage.tsx fixing each. --- src/problem3/ISSUES.md | 46 ++++++++++++++++++++++ src/problem3/refactored.tsx | 76 +++++++++++++++++++++++++++++++++++++ 2 files changed, 122 insertions(+) create mode 100644 src/problem3/ISSUES.md create mode 100644 src/problem3/refactored.tsx diff --git a/src/problem3/ISSUES.md b/src/problem3/ISSUES.md new file mode 100644 index 0000000000..25a7859f5e --- /dev/null +++ b/src/problem3/ISSUES.md @@ -0,0 +1,46 @@ +# Issues found in the original code + +1. **Undefined variable `lhsPriority`** — the filter uses `lhsPriority` but only + `balancePriority` was declared. This throws a `ReferenceError` at runtime. + +2. **Inverted filter logic** — the filter keeps balances where + `balance.amount <= 0`, which keeps empty/zero/negative balances and drops + the ones actually worth displaying. It should keep `amount > 0`. + +3. **`blockchain` used but not typed** — `WalletBalance` has no `blockchain` + field, so `getPriority(balance.blockchain)` only compiles because the + parameter is typed `any`. This hides a real type error. + +4. **Sort comparator missing an equal case** — when `leftPriority === rightPriority` + the comparator falls through and returns `undefined` instead of `0`, + which is not a valid `Array.prototype.sort` comparator return value. + +5. **`useMemo` depends on `prices` but never uses it** — `sortedBalances` only + reads `balances` and `getPriority`. The `prices` dependency causes + pointless recomputation every time prices tick. + +6. **`formattedBalances` is computed then discarded** — `rows` maps over + `sortedBalances` again (not `formattedBalances`), so the formatting work + is wasted, and the `balance` passed to `WalletRow` is typed as + `FormattedWalletBalance` while actually being a plain `WalletBalance` + (no `formatted` field at runtime). + +7. **`toFixed()` with no argument** — always rounds to whole numbers, + losing precision for any token with meaningful decimals. + +8. **`getPriority` recreated every render** — it's a pure function with no + dependency on props/state, so defining it inside the component body + (and calling it repeatedly for the same blockchain during sort) is + wasted work. It belongs outside the component, as a constant lookup. + +9. **List keyed by array `index`** — `key={index}` breaks React's + reconciliation when the list reorders/filters (which it does every + render here), causing unnecessary DOM churn and potential state bugs + in `WalletRow`. Should key by a stable id (`balance.currency` here). + +10. **`children` destructured but never rendered** — `const { children, ...rest } = props` + pulls `children` out and then only `rows` are rendered inside the + `div`, silently dropping anything passed as children. + +11. **Empty interface extension** — `interface Props extends BoxProps {}` + adds nothing over `type Props = BoxProps`. diff --git a/src/problem3/refactored.tsx b/src/problem3/refactored.tsx new file mode 100644 index 0000000000..2512af2580 --- /dev/null +++ b/src/problem3/refactored.tsx @@ -0,0 +1,76 @@ +import { useMemo } from 'react'; +// Assumption: these come from elsewhere in the real codebase, same as the +// original snippet — kept as-is since they're outside the scope of this fix. +import { useWalletBalances, usePrices } from './hooks'; +import { WalletRow } from './WalletRow'; +import { BoxProps } from './Box'; +import classes from './WalletPage.module.css'; + +type Blockchain = 'Osmosis' | 'Ethereum' | 'Arbitrum' | 'Zilliqa' | 'Neo' | string; + +interface WalletBalance { + currency: string; + amount: number; + blockchain: Blockchain; +} + +interface FormattedWalletBalance extends WalletBalance { + formatted: string; +} + +type Props = BoxProps; + +// Pure lookup, no reason to recreate this function (or its switch) every render. +const BLOCKCHAIN_PRIORITY: Record = { + Osmosis: 100, + Ethereum: 50, + Arbitrum: 30, + Zilliqa: 20, + Neo: 20, +}; + +function getPriority(blockchain: Blockchain): number { + return BLOCKCHAIN_PRIORITY[blockchain] ?? -99; +} + +const WalletPage: React.FC = ({ children, ...rest }) => { + const balances = useWalletBalances(); + const prices = usePrices(); + + const sortedBalances = useMemo(() => { + return balances + .filter((balance: WalletBalance) => getPriority(balance.blockchain) > -99 && balance.amount > 0) + .sort((lhs: WalletBalance, rhs: WalletBalance) => getPriority(rhs.blockchain) - getPriority(lhs.blockchain)); + }, [balances]); + + const formattedBalances: FormattedWalletBalance[] = useMemo( + () => + sortedBalances.map((balance) => ({ + ...balance, + formatted: balance.amount.toFixed(2), + })), + [sortedBalances] + ); + + const rows = formattedBalances.map((balance) => { + const usdValue = (prices[balance.currency] ?? 0) * balance.amount; + return ( + + ); + }); + + return ( +
+ {rows} + {children} +
+ ); +}; + +export default WalletPage; From f1cd5ad185dac568f8a46e719a8eaae9a8f5f3fc Mon Sep 17 00:00:00 2001 From: rkrfld Date: Tue, 18 Aug 2026 21:59:17 +0700 Subject: [PATCH 4/6] feat(problem4): implement sum_to_n in TypeScript with complexity notes Same three approaches as problem1 (loop, Gauss formula, recursion), typed, each annotated with time/space complexity. Verified against n = 0, 1, 5, 100. --- src/problem4/sum_to_n.ts | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 src/problem4/sum_to_n.ts diff --git a/src/problem4/sum_to_n.ts b/src/problem4/sum_to_n.ts new file mode 100644 index 0000000000..33377e2928 --- /dev/null +++ b/src/problem4/sum_to_n.ts @@ -0,0 +1,28 @@ +// Three unique implementations of sum_to_n(n) = 1 + 2 + ... + n + +// a) Iterative loop +// Time: O(n) — one addition per iteration +// Space: O(1) — single accumulator +function sum_to_n_a(n: number): number { + let sum = 0; + for (let i = 1; i <= n; i++) sum += i; + return sum; +} + +// b) Mathematical formula (Gauss sum) +// Time: O(1) — constant number of arithmetic ops regardless of n +// Space: O(1) +// Fastest and most scalable; the only one safe for very large n. +function sum_to_n_b(n: number): number { + return (n * (n + 1)) / 2; +} + +// c) Recursive +// Time: O(n) — n recursive calls +// Space: O(n) — call stack grows with n, risks a stack overflow for large n +function sum_to_n_c(n: number): number { + if (n <= 0) return 0; + return n + sum_to_n_c(n - 1); +} + +export { sum_to_n_a, sum_to_n_b, sum_to_n_c }; From f9044a9d1d73bfb11eefdf29931e8ac9d266fd4b Mon Sep 17 00:00:00 2001 From: rkrfld Date: Tue, 18 Aug 2026 22:02:41 +0700 Subject: [PATCH 5/6] feat(problem5): build Express+TypeScript CRUD API with file persistence Resource CRUD (create/list/get/update/delete) with category/search/price filters, validated input, lowdb JSON-file persistence (no native deps). README covers config and run steps. Verified live: full CRUD flow, filters, 400/404 paths, disk persistence. --- src/problem5/.gitignore | 4 + src/problem5/.keep | 0 src/problem5/README.md | 85 ++ src/problem5/package-lock.json | 1796 ++++++++++++++++++++++++++ src/problem5/package.json | 24 + src/problem5/src/db.ts | 13 + src/problem5/src/routes/resources.ts | 123 ++ src/problem5/src/server.ts | 16 + src/problem5/src/types.ts | 27 + src/problem5/tsconfig.json | 14 + 10 files changed, 2102 insertions(+) create mode 100644 src/problem5/.gitignore delete mode 100644 src/problem5/.keep create mode 100644 src/problem5/README.md create mode 100644 src/problem5/package-lock.json create mode 100644 src/problem5/package.json create mode 100644 src/problem5/src/db.ts create mode 100644 src/problem5/src/routes/resources.ts create mode 100644 src/problem5/src/server.ts create mode 100644 src/problem5/src/types.ts create mode 100644 src/problem5/tsconfig.json diff --git a/src/problem5/.gitignore b/src/problem5/.gitignore new file mode 100644 index 0000000000..4e99c0694a --- /dev/null +++ b/src/problem5/.gitignore @@ -0,0 +1,4 @@ +node_modules +dist +data.json +*.log diff --git a/src/problem5/.keep b/src/problem5/.keep deleted file mode 100644 index e69de29bb2..0000000000 diff --git a/src/problem5/README.md b/src/problem5/README.md new file mode 100644 index 0000000000..4fa1b164db --- /dev/null +++ b/src/problem5/README.md @@ -0,0 +1,85 @@ +# Problem 5 — A Crude Server + +CRUD REST API for a `Resource` entity, built with Express + TypeScript, +persisted to a JSON file on disk via [lowdb](https://github.com/typicode/lowdb) +(v1, synchronous file adapter — no native build step, just a real file that +survives restarts). + +## Resource shape + +```json +{ + "id": "uuid", + "name": "string (required)", + "description": "string", + "category": "string", + "price": "number >= 0", + "createdAt": "ISO date", + "updatedAt": "ISO date" +} +``` + +## Configuration + +Environment variables (optional, both have defaults): + +| Variable | Default | Description | +|-----------|-------------------------|--------------------------------------| +| `PORT` | `3000` | HTTP port the server listens on | +| `DB_FILE` | `/data.json` | Path to the JSON persistence file | + +## Running + +```bash +npm install +npm run dev # ts-node-dev, auto-restarts on file change +``` + +or build and run compiled JS: + +```bash +npm run build +npm start +``` + +`data.json` is created automatically on first run and gitignored. + +## API + +| Method | Path | Description | +|--------|------------------|---------------------------------------------------| +| POST | `/resources` | Create a resource | +| GET | `/resources` | List resources, with optional filters (below) | +| GET | `/resources/:id` | Get one resource | +| PUT | `/resources/:id` | Update a resource (partial) | +| DELETE | `/resources/:id` | Delete a resource | +| GET | `/health` | Health check | + +### List filters (query params, all optional, combinable) + +- `category` — exact match, case-insensitive +- `search` — substring match against `name` or `description`, case-insensitive +- `minPrice`, `maxPrice` — numeric bounds on `price` + +### Examples + +```bash +curl -X POST localhost:3000/resources \ + -H 'Content-Type: application/json' \ + -d '{"name":"Widget","category":"hardware","price":9.99}' + +curl 'localhost:3000/resources?category=hardware&minPrice=5' + +curl localhost:3000/resources/ + +curl -X PUT localhost:3000/resources/ \ + -H 'Content-Type: application/json' \ + -d '{"price":12.5}' + +curl -X DELETE localhost:3000/resources/ +``` + +`name` is required on create and, if provided, must be a non-empty string on +update; `price` must be a non-negative number when given. Invalid input +returns `400` with an `{ "error": "..." }` body; a missing resource returns +`404`. diff --git a/src/problem5/package-lock.json b/src/problem5/package-lock.json new file mode 100644 index 0000000000..35fcda304d --- /dev/null +++ b/src/problem5/package-lock.json @@ -0,0 +1,1796 @@ +{ + "name": "problem5", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "problem5", + "version": "1.0.0", + "dependencies": { + "express": "^4.19.2", + "lowdb": "^1.0.0", + "uuid": "^9.0.1" + }, + "devDependencies": { + "@types/express": "^4.17.21", + "@types/lowdb": "^1.0.15", + "@types/node": "^20.14.9", + "@types/uuid": "^9.0.8", + "ts-node-dev": "^2.0.0", + "typescript": "^5.5.3" + } + }, + "node_modules/@cspotcode/source-map-support": { + "version": "0.8.1", + "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz", + "integrity": 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path.join(__dirname, '..', 'data.json'); + +const adapter = new FileSync(DB_FILE); +const db = low(adapter); + +db.defaults({ resources: [] }).write(); + +export default db; diff --git a/src/problem5/src/routes/resources.ts b/src/problem5/src/routes/resources.ts new file mode 100644 index 0000000000..931ece9e7e --- /dev/null +++ b/src/problem5/src/routes/resources.ts @@ -0,0 +1,123 @@ +import { Router, Request, Response } from 'express'; +import { v4 as uuidv4 } from 'uuid'; +import db from '../db'; +import { CreateResourceInput, UpdateResourceInput } from '../types'; + +const router = Router(); + +function validateCreate(body: any): { valid: true; data: CreateResourceInput } | { valid: false; error: string } { + if (typeof body.name !== 'string' || body.name.trim() === '') { + return { valid: false, error: 'name is required and must be a non-empty string' }; + } + if (body.description !== undefined && typeof body.description !== 'string') { + return { valid: false, error: 'description must be a string' }; + } + if (body.category !== undefined && typeof body.category !== 'string') { + return { valid: false, error: 'category must be a string' }; + } + if (body.price !== undefined && (typeof body.price !== 'number' || body.price < 0)) { + return { valid: false, error: 'price must be a non-negative number' }; + } + return { valid: true, data: body }; +} + +function validateUpdate(body: any): { valid: true; data: UpdateResourceInput } | { valid: false; error: string } { + if (body.name !== undefined && (typeof body.name !== 'string' || body.name.trim() === '')) { + return { valid: false, error: 'name must be a non-empty string' }; + } + if (body.description !== undefined && typeof body.description !== 'string') { + return { valid: false, error: 'description must be a string' }; + } + if (body.category !== undefined && typeof body.category !== 'string') { + return { valid: false, error: 'category must be a string' }; + } + if (body.price !== undefined && (typeof body.price !== 'number' || body.price < 0)) { + return { valid: false, error: 'price must be a non-negative number' }; + } + return { valid: true, data: body }; +} + +// POST /resources — create +router.post('/', (req: Request, res: Response) => { + const result = validateCreate(req.body ?? {}); + if (!result.valid) return res.status(400).json({ error: result.error }); + + const now = new Date().toISOString(); + const resource = { + id: uuidv4(), + name: result.data.name, + description: result.data.description ?? '', + category: result.data.category ?? '', + price: result.data.price ?? 0, + createdAt: now, + updatedAt: now, + }; + + db.get('resources').push(resource).write(); + res.status(201).json(resource); +}); + +// GET /resources — list with basic filters: category, search (name/description), minPrice, maxPrice +router.get('/', (req: Request, res: Response) => { + const { category, search, minPrice, maxPrice } = req.query; + let resources = db.get('resources').value(); + + if (typeof category === 'string' && category !== '') { + resources = resources.filter((r) => r.category.toLowerCase() === category.toLowerCase()); + } + + if (typeof search === 'string' && search !== '') { + const needle = search.toLowerCase(); + resources = resources.filter( + (r) => r.name.toLowerCase().includes(needle) || r.description.toLowerCase().includes(needle) + ); + } + + if (typeof minPrice === 'string' && minPrice !== '') { + const min = Number(minPrice); + if (!Number.isNaN(min)) resources = resources.filter((r) => r.price >= min); + } + + if (typeof maxPrice === 'string' && maxPrice !== '') { + const max = Number(maxPrice); + if (!Number.isNaN(max)) resources = resources.filter((r) => r.price <= max); + } + + res.json(resources); +}); + +// GET /resources/:id — detail +router.get('/:id', (req: Request, res: Response) => { + const resource = db.get('resources').find({ id: req.params.id }).value(); + if (!resource) return res.status(404).json({ error: 'Resource not found' }); + res.json(resource); +}); + +// PUT /resources/:id — update +router.put('/:id', (req: Request, res: Response) => { + const existing = db.get('resources').find({ id: req.params.id }).value(); + if (!existing) return res.status(404).json({ error: 'Resource not found' }); + + const result = validateUpdate(req.body ?? {}); + if (!result.valid) return res.status(400).json({ error: result.error }); + + const updated = { + ...existing, + ...result.data, + updatedAt: new Date().toISOString(), + }; + + db.get('resources').find({ id: req.params.id }).assign(updated).write(); + res.json(updated); +}); + +// DELETE /resources/:id — delete +router.delete('/:id', (req: Request, res: Response) => { + const existing = db.get('resources').find({ id: req.params.id }).value(); + if (!existing) return res.status(404).json({ error: 'Resource not found' }); + + db.get('resources').remove({ id: req.params.id }).write(); + res.status(204).send(); +}); + +export default router; diff --git a/src/problem5/src/server.ts b/src/problem5/src/server.ts new file mode 100644 index 0000000000..4fd582c264 --- /dev/null +++ b/src/problem5/src/server.ts @@ -0,0 +1,16 @@ +import express from 'express'; +import resourcesRouter from './routes/resources'; + +const app = express(); +const PORT = process.env.PORT ? Number(process.env.PORT) : 3000; + +app.use(express.json()); +app.use('/resources', resourcesRouter); + +app.get('/health', (_req, res) => res.json({ status: 'ok' })); + +app.listen(PORT, () => { + console.log(`Server listening on http://localhost:${PORT}`); +}); + +export default app; diff --git a/src/problem5/src/types.ts b/src/problem5/src/types.ts new file mode 100644 index 0000000000..5caf38d3a4 --- /dev/null +++ b/src/problem5/src/types.ts @@ -0,0 +1,27 @@ +export interface Resource { + id: string; + name: string; + description: string; + category: string; + price: number; + createdAt: string; + updatedAt: string; +} + +export interface Database { + resources: Resource[]; +} + +export interface CreateResourceInput { + name: string; + description?: string; + category?: string; + price?: number; +} + +export interface UpdateResourceInput { + name?: string; + description?: string; + category?: string; + price?: number; +} diff --git a/src/problem5/tsconfig.json b/src/problem5/tsconfig.json new file mode 100644 index 0000000000..f77b062078 --- /dev/null +++ b/src/problem5/tsconfig.json @@ -0,0 +1,14 @@ +{ + "compilerOptions": { + "target": "ES2020", + "module": "commonjs", + "moduleResolution": "node", + "outDir": "dist", + "rootDir": "src", + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "resolveJsonModule": true + }, + "include": ["src"] +} From a172b5f6e0bd94228681767eb6a82933fb4d28ac Mon Sep 17 00:00:00 2001 From: rkrfld Date: Tue, 18 Aug 2026 22:05:14 +0700 Subject: [PATCH 6/6] docs(problem6): spec live scoreboard module with anti-cheat design Data model (append-only score_events ledger + action_grants for one-time redeemable awards), API, execution-flow diagram, real-time delivery via pub/sub + selective top-10 cache invalidation, and anti-abuse design where the client never states its own point value. --- src/problem6/README.md | 190 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 190 insertions(+) create mode 100644 src/problem6/README.md diff --git a/src/problem6/README.md b/src/problem6/README.md new file mode 100644 index 0000000000..5ebe6750ad --- /dev/null +++ b/src/problem6/README.md @@ -0,0 +1,190 @@ +# Problem 6 — Scoreboard API Module Spec + +Backend module for a live top-10 scoreboard. A user performs an action in the +product; on completion the client calls our API to award score; the +scoreboard updates in real time for every connected viewer; no client can +grant itself score it didn't earn. + +## 1. Scope + +- Persist per-user scores. +- Serve the current top 10 or updates it live to viewers. +- Accept "user completed an action worth points" events from the client, + but never trust the client for *how much* or *whether* it happened. + +Out of scope (owned by other modules, referenced only where the interface +matters): what the scoreable action actually is, the action's own business +logic/UI, user auth/session issuance (we consume it, not issue it). + +## 2. Data model + +``` +users scores action_grants +--------------- --------------------- ----------------------------- +id (PK) user_id (PK, FK -> users) id (PK) +... score (bigint, default 0) user_id (FK -> users) + updated_at action_type + nonce (unique) +score_events status (issued|redeemed|expired) +----------------------------- issued_at +id (PK) expires_at +user_id (FK -> users) redeemed_at +action_type +points (int) +action_grant_id (FK -> action_grants, unique) +created_at +``` + +- `score_events` is an append-only ledger — the source of truth. `scores.score` + is a denormalized running total kept in sync in the same transaction as the + insert, so a read-heavy scoreboard never has to `SUM()` the ledger. +- `action_grants` is what makes an award redeemable exactly once (see §4). + +## 3. API + +All endpoints require an authenticated session (bearer token / cookie issued +by the existing auth module). All are versioned under `/api/v1`. + +| Method | Path | Purpose | +|--------|-------------------------------|-----------------------------------------------------------------| +| POST | `/actions/:type/grant` | Client asks to start a scoreable action; server issues a one-time grant token | +| POST | `/actions/complete` | Client reports the action finished; redeems the grant, awards points | +| GET | `/scoreboard/top` | Current top 10 (fallback for clients without a live connection) | +| WS | `/scoreboard/live` | Subscribe to push updates whenever the top 10 changes | + +### `POST /actions/:type/grant` + +Called when the user *starts* the action (e.g. opens the game, clicks +"begin"). Server decides if this user/action is currently eligible (rate +limits, cooldowns, daily caps) and, if so, issues a short-lived, single-use +grant. + +Response: `{ grantId, nonce, expiresAt }` + +### `POST /actions/complete` + +Body: `{ grantId, nonce, proof? }` + +`proof` is action-specific evidence the module can check server-side when the +action has server-verifiable state (e.g. a game server that already knows +the real outcome, an order that was actually placed). Where no such state +exists, the grant itself — issued only when the server already agreed the +action was eligible — is the control; the client never supplies the point +value. + +Server logic (see §4 for the full flow): validate grant → run the +action-specific point-value rule → write `score_events` + update `scores` in +one transaction → invalidate grant → publish the delta. + +Response: `{ newScore, rank }` + +### `GET /scoreboard/top` + +Response: `{ entries: [{ userId, displayName, score, rank }, ...10] }`. Served +from a cache (see §5), not a live `ORDER BY score DESC LIMIT 10` on every hit. + +### `WS /scoreboard/live` + +On connect: server sends the current top 10. Thereafter: server pushes +`{ entries: [...] }` only when the top-10 set or ordering actually changes — +not on every score event, so a hot streak doesn't flood every viewer. + +## 4. Execution flow + +```mermaid +sequenceDiagram + participant U as User (client) + participant API as Scoreboard API + participant DB as DB (scores, score_events, action_grants) + participant Cache as Top-10 cache + participant WS as WS gateway + participant V as Other viewers + + U->>API: POST /actions/:type/grant + API->>API: check eligibility (rate limit, cooldown, daily cap) + API->>DB: insert action_grants (status=issued, expiry) + API-->>U: { grantId, nonce, expiresAt } + + Note over U: user performs the actual action in the UI + + U->>API: POST /actions/complete { grantId, nonce, proof? } + API->>DB: fetch grant WHERE id AND nonce AND status='issued' AND not expired + alt grant invalid, expired, or already redeemed + API-->>U: 409 Conflict + else grant valid + API->>API: resolve point value (fixed per action_type, or from proof/server state) + API->>DB: BEGIN TX + API->>DB: mark grant status='redeemed' + API->>DB: insert score_events (append-only ledger) + API->>DB: upsert scores.score += points + API->>DB: COMMIT + API-->>U: { newScore, rank } + API->>Cache: recompute top 10 if this user's new score enters/reorders it + opt top 10 changed + API->>WS: publish new top 10 + WS->>V: push { entries } + end + end +``` + +## 5. Real-time delivery + +- WS gateway is a thin pub/sub layer (e.g. Redis pub/sub or the DB's + `LISTEN/NOTIFY` behind it) — the API process publishes a "top 10 changed" + event; gateway instances fan it out to their connected sockets. This lets + the API and the WS gateway scale independently. +- The top-10 cache (Redis, TTL as a safety net) is invalidated/recomputed + only on writes that could plausibly affect the top 10 — i.e. any score + update where `newScore` >= current 10th-place score. Everyone else's score + going up doesn't touch it. +- Clients without a live connection just poll `GET /scoreboard/top`, which + reads the same cache. + +## 6. Anti-abuse / integrity + +The core rule: **the client can request permission to earn points and can +report completion, but it never states how many points it gets.** + +1. **Grant/redeem, not "add points".** `/actions/complete` never accepts a + score delta from the client. The point value comes from server-side + config per `action_type` (or server-verified `proof` when the action has + its own authoritative state, e.g. a match result already recorded by a + game service). +2. **One-time, expiring, nonce-bound grants.** A grant is redeemable exactly + once (`status` transition is atomic in the same transaction, guarded by a + unique index on `action_grants.id` + a `WHERE status='issued'` check). + Replaying a captured request fails once it's already redeemed. Expiry + caps how long a leaked grant is useful. +3. **Rate limits and daily/session caps** at grant-issuance time, keyed by + user and action_type — bounds the maximum possible score inflation even + if every grant issued were legitimately redeemed back-to-back. +4. **Append-only ledger.** `score_events` records every award with its + grant, so `scores.score` is always reconstructable/auditable; a support + or fraud team can diff the denormalized total against the ledger to catch + any drift (bug or tampering) automatically. +5. **Anomaly monitoring.** Alert on per-user score velocity outliers, unusual + grant-issue-to-redeem timing (near-zero = likely scripted), or a spike in + 409s (replay attempts). Feed into existing abuse tooling rather than + building a bespoke fraud system here. +6. **Standard transport/session hardening** (HTTPS, existing session auth, + CSRF protection on the grant/complete endpoints) — not scoreboard-specific + but a prerequisite. + +This design does not fully prevent a user from legitimately completing the +action many times in automatable ways (e.g. scripting genuine plays) — that's +a product/rate-limit tuning question, not something this module can solve by +itself. It does prevent a client from forging point values or replaying a +single completion into repeated score. + +## 7. Suggested improvements for the implementing team + +- Confirm whether any action types have their own server-side truth (a game + server, an order service) — for those, `proof` verification should call + that service directly rather than trusting the grant alone. +- Decide the eviction/backfill policy for `action_grants` (e.g. a cron to + expire stale `issued` rows) so the table doesn't grow unbounded. +- If leaderboards need to be per-scope (weekly, per-region, per-game-mode) + rather than global all-time, that changes the cache key and the + `scores` table shape — worth deciding before, not after, launch. +- Consider signing the WS push payload or scoping it to authenticated + connections only if scores are considered sensitive per-user data.