diff --git a/src/problem1/sum_to_n.js b/src/problem1/sum_to_n.js new file mode 100644 index 0000000000..4e93b97f6b --- /dev/null +++ b/src/problem1/sum_to_n.js @@ -0,0 +1,57 @@ +/** + * Problem: Summation from 1 to n. + * Input: n — integer (result assumed < Number.MAX_SAFE_INTEGER). + * Output: 1 + 2 + ... + n (e.g. sum_to_n(5) === 15). + * + * Edge cases handled: + * - n < 1: returns 0 (empty sum). + * - Non-integer n: truncated via Math.floor for predictable behavior. + */ + +/** + * Implementation A: Closed-form formula. + * Uses the identity: 1 + 2 + ... + n = n * (n + 1) / 2. + * + * Time: O(1) + * Space: O(1) + */ +var sum_to_n_a = function (n) { + var k = Math.floor(Number(n)); + if (k < 1) return 0; + return (k * (k + 1)) / 2; +}; + +/** + * Implementation B: Iterative loop (for). + * Accumulates the sum in a single variable. + * + * Time: O(n) + * Space: O(1) + */ +var sum_to_n_b = function (n) { + var k = Math.floor(Number(n)); + if (k < 1) return 0; + var sum = 0; + for (var i = 1; i <= k; i++) { + sum += i; + } + return sum; +}; + +/** + * Implementation C: Recursion. + * Base case: n < 1 → 0. Otherwise: n + sum_to_n_c(n - 1). + * + * Time: O(n) + * Space: O(n) — call stack depth + */ +var sum_to_n_c = function (n) { + var k = Math.floor(Number(n)); + if (k < 1) return 0; + return k + sum_to_n_c(k - 1); +}; + +// Export for tests and reuse +if (typeof module !== "undefined" && module.exports) { + module.exports = { sum_to_n_a, sum_to_n_b, sum_to_n_c }; +} diff --git a/src/problem1/sum_to_n.test.js b/src/problem1/sum_to_n.test.js new file mode 100644 index 0000000000..70c53141bd --- /dev/null +++ b/src/problem1/sum_to_n.test.js @@ -0,0 +1,51 @@ +/** + * Tests for sum_to_n implementations. + * Run with: node sum_to_n.test.js + */ + +var assert = require("assert"); +var { sum_to_n_a, sum_to_n_b, sum_to_n_c } = require("./sum_to_n.js"); + +var implementations = [ + { name: "sum_to_n_a", fn: sum_to_n_a }, + { name: "sum_to_n_b", fn: sum_to_n_b }, + { name: "sum_to_n_c", fn: sum_to_n_c }, +]; + +function runTests() { + var passed = 0; + var failed = 0; + + function test(description, n, expected) { + implementations.forEach(function (impl) { + try { + var result = impl.fn(n); + assert.strictEqual( + result, + expected, + impl.name + "(" + n + ") expected " + expected + ", got " + result + ); + passed++; + } catch (err) { + console.error("FAIL " + impl.name + ": " + description + " — " + err.message); + failed++; + } + }); + } + + // Normal cases + test("sum to 5", 5, 15); + test("sum to 1", 1, 1); + test("sum to 10", 10, 55); + test("sum to 100", 100, 5050); + + // Edge cases + test("n = 0", 0, 0); + test("n negative", -5, 0); + test("non-integer (floor)", 5.9, 15); + + console.log("Tests: " + passed + " passed, " + failed + " failed"); + process.exit(failed > 0 ? 1 : 0); +} + +runTests(); diff --git a/src/problem2/script.js b/src/problem2/.keep similarity index 100% rename from src/problem2/script.js rename to src/problem2/.keep diff --git a/src/problem2/App.jsx b/src/problem2/App.jsx new file mode 100644 index 0000000000..d3864f5b0d --- /dev/null +++ b/src/problem2/App.jsx @@ -0,0 +1,10 @@ +import React from "react"; +import { SwapForm } from "./src/components/SwapForm"; + +export default function App() { + return ( +
+ +
+ ); +} diff --git a/src/problem2/README.md b/src/problem2/README.md new file mode 100644 index 0000000000..2abf049004 --- /dev/null +++ b/src/problem2/README.md @@ -0,0 +1,46 @@ +# Problem 2: Currency Swap Form + +Form đổi token dùng **Vite** + **React**. Logic viết bằng **TypeScript** (services, hooks, utils, types); UI giữ bằng JSX trong `src/components`. + +## Chạy + +```bash +cd src/problem2 +npm install +npm run dev +``` + +Mở http://localhost:5173 + +## Nguồn dữ liệu + +- **Giá token:** https://interview.switcheo.com/prices.json +- **Icon token:** https://github.com/Switcheo/token-icons/tree/main/tokens (vd: SWTH.svg) + +--- + +## Cấu trúc (components, logic = TS) + +``` +src/ +├── components/ # UI (JSX) +│ ├── SwapForm.jsx +│ ├── SwapCard.jsx +│ ├── TokenSelect.jsx +│ ├── TokenIcon.jsx +│ └── SwapFormStyles.jsx +├── hooks/ # Logic (TypeScript) +│ ├── useTokensWithPrices.ts +│ └── useSwapForm.ts +├── services/ # API (TypeScript) +│ └── priceService.ts +├── utils/ # Hàm thuần (TypeScript) +│ ├── tokenIcon.ts +│ ├── exchange.ts +│ └── validation.ts +└── types/ # Định nghĩa type (TypeScript) + └── index.ts +``` + +- **Logic (TS):** `types`, `services`, `hooks`, `utils` — toàn bộ file `.ts`. +- **UI (JSX):** `components` — file `.jsx`, chỉ render và nhận props, gọi hooks từ container. diff --git a/src/problem2/index.css b/src/problem2/index.css new file mode 100644 index 0000000000..5038f0d445 --- /dev/null +++ b/src/problem2/index.css @@ -0,0 +1,51 @@ +:root { + --bg-primary: #0d0f14; + --bg-card: #151922; + --bg-input: #1a1e28; + --border: #2a3142; + --text-primary: #e6e8ec; + --text-secondary: #8b92a5; + --accent: #00d395; + --accent-dim: #00a876; + --error: #ff5c5c; + --radius: 14px; + --radius-sm: 10px; + --shadow: 0 12px 40px rgba(0, 0, 0, 0.4); + --font-sans: "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif; +} + +*, +*::before, +*::after { + box-sizing: border-box; +} + +body { + margin: 0; + min-height: 100vh; + background: var(--bg-primary); + color: var(--text-primary); + font-family: var(--font-sans); + font-size: 16px; + line-height: 1.5; + -webkit-font-smoothing: antialiased; +} + +.app { + min-height: 100vh; + display: flex; + align-items: center; + justify-content: center; + padding: 24px; + width: 100%; +} + +#root { + width: 100%; + max-width: 520px; + margin: 0 auto; + display: flex; + align-items: center; + justify-content: center; + min-height: 100vh; +} diff --git a/src/problem2/index.html b/src/problem2/index.html index 4058a68bff..6d53a41a31 100644 --- a/src/problem2/index.html +++ b/src/problem2/index.html @@ -1,27 +1,16 @@ - - - - - Fancy Form - - - - - - - - -
-
Swap
- - - - - - - -
- - - + + + + + + Currency Swap + + + + + + +
+ + diff --git a/src/problem2/main.jsx b/src/problem2/main.jsx new file mode 100644 index 0000000000..f18b0f0d14 --- /dev/null +++ b/src/problem2/main.jsx @@ -0,0 +1,10 @@ +import React from "react"; +import ReactDOM from "react-dom/client"; +import App from "./App"; +import "./index.css"; + +ReactDOM.createRoot(document.getElementById("root")).render( + + + +); diff --git a/src/problem2/package-lock.json b/src/problem2/package-lock.json new file mode 100644 index 0000000000..50c1daff37 --- /dev/null +++ b/src/problem2/package-lock.json @@ -0,0 +1,1729 @@ +{ + "name": "currency-swap-form", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "currency-swap-form", + "version": "1.0.0", + "dependencies": { + "react": "^18.2.0", + "react-dom": "^18.2.0" + }, + "devDependencies": { + "@types/react": "^18.2.0", + "@types/react-dom": "^18.2.0", + "@vitejs/plugin-react": "^4.2.1", + "typescript": "^5.3.0", + "vite": "^5.4.0" + } + }, + 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"vite build", + "preview": "vite preview" + }, + "dependencies": { + "react": "^18.2.0", + "react-dom": "^18.2.0" + }, + "devDependencies": { + "@types/react": "^18.2.0", + "@types/react-dom": "^18.2.0", + "@vitejs/plugin-react": "^4.2.1", + "typescript": "^5.3.0", + "vite": "^5.4.0" + } +} diff --git a/src/problem2/src/components/SwapCard.jsx b/src/problem2/src/components/SwapCard.jsx new file mode 100644 index 0000000000..a5801e6acf --- /dev/null +++ b/src/problem2/src/components/SwapCard.jsx @@ -0,0 +1,135 @@ +import React from "react"; +import { TokenSelect } from "./TokenSelect"; + +export function SwapCard({ + title = "Swap", + tokens = [], + tokensLoading, + tokensError, + onRetry, + fromToken, + toToken, + fromAmountRaw, + fromAmountError, + toAmount, + exchangeRate, + submitState, + canSubmit, + sameTokenError, + onFromTokenSelect, + onToTokenSelect, + onFromAmountChange, + onSwapDirection, + onSubmit, +}) { + return ( +
+

{title}

+ + {tokensError && ( +
+ {tokensError} + +
+ )} + + {tokensLoading && ( +
Loading tokens…
+ )} + + {!tokensLoading && ( +
+
+ + + onFromAmountChange(e.target.value)} + className={fromAmountError ? "swap-input swap-input-error" : "swap-input"} + aria-invalid={!!fromAmountError} + aria-describedby={fromAmountError ? "from-amount-error" : undefined} + disabled={tokensLoading} + /> + {fromAmountError && ( + + {fromAmountError} + + )} +
+ + + +
+ + + 0 ? toAmount.toFixed(6) : ""} + className="swap-input swap-input-readonly" + aria-readonly="true" + disabled + /> + {exchangeRate != null && fromToken && toToken && ( +

+ 1 {fromToken.currency} ≈ {exchangeRate.toFixed(6)} {toToken.currency} +

+ )} +
+ + {sameTokenError && ( +

+ Select different tokens for from and to. +

+ )} + + +
+ )} +
+ ); +} diff --git a/src/problem2/src/components/SwapForm.jsx b/src/problem2/src/components/SwapForm.jsx new file mode 100644 index 0000000000..13d2575234 --- /dev/null +++ b/src/problem2/src/components/SwapForm.jsx @@ -0,0 +1,75 @@ +import React, { useState, useEffect, useRef } from "react"; +import { useTokensWithPrices } from "../hooks/useTokensWithPrices"; +import { useSwapForm } from "../hooks/useSwapForm"; +import { SwapCard } from "./SwapCard"; +import { SwapFormStyles } from "./SwapFormStyles"; +import { Toast } from "./Toast"; + +function formatAmount(num) { + if (num >= 1e6) return num.toExponential(2); + if (num >= 1) return num.toFixed(4); + if (num > 0) return num.toFixed(6); + return "0"; +} + +export function SwapForm() { + const { tokens, loading: tokensLoading, error: tokensError, refetch } = useTokensWithPrices(); + const swap = useSwapForm(tokens); + const [toast, setToast] = useState(null); + const prevSubmitState = useRef(swap.submitState); + + useEffect(() => { + if (swap.submitState === "success" && prevSubmitState.current !== "success") { + const s = swap.lastSwapSummary; + const msg = s + ? `Swapped ${formatAmount(s.fromAmount)} ${s.fromCurrency} for ${formatAmount(s.toAmount)} ${s.toCurrency}` + : "Swap successful"; + setToast({ message: msg, type: "success" }); + } else if (swap.submitState === "error" && prevSubmitState.current !== "error") { + const s = swap.lastSwapSummary; + const msg = s + ? `Swap failed: ${formatAmount(s.fromAmount)} ${s.fromCurrency} → ${formatAmount(s.toAmount)} ${s.toCurrency}. Please try again.` + : "Swap failed. Please try again."; + setToast({ message: msg, type: "error" }); + } + prevSubmitState.current = swap.submitState; + }, [swap.submitState, swap.lastSwapSummary]); + + return ( + <> + + {toast && ( +
+ setToast(null)} + duration={4000} + /> +
+ )} + + + ); +} diff --git a/src/problem2/src/components/SwapFormStyles.jsx b/src/problem2/src/components/SwapFormStyles.jsx new file mode 100644 index 0000000000..2f92f10513 --- /dev/null +++ b/src/problem2/src/components/SwapFormStyles.jsx @@ -0,0 +1,390 @@ +import React from "react"; + +export function SwapFormStyles() { + return ( + + ); +} diff --git a/src/problem2/src/components/Toast.jsx b/src/problem2/src/components/Toast.jsx new file mode 100644 index 0000000000..2e41a7a19b --- /dev/null +++ b/src/problem2/src/components/Toast.jsx @@ -0,0 +1,27 @@ +import React, { useEffect } from "react"; + +export function Toast({ message, type = "info", onDismiss, duration = 4000 }) { + useEffect(() => { + if (!duration || !onDismiss) return; + const id = setTimeout(onDismiss, duration); + return () => clearTimeout(id); + }, [duration, onDismiss]); + + return ( +
+ {message} + +
+ ); +} diff --git a/src/problem2/src/components/TokenIcon.jsx b/src/problem2/src/components/TokenIcon.jsx new file mode 100644 index 0000000000..8e2e865517 --- /dev/null +++ b/src/problem2/src/components/TokenIcon.jsx @@ -0,0 +1,24 @@ +import React, { useState } from "react"; + +export function TokenIcon({ src, symbol, className = "", priority = false }) { + const [imageError, setImageError] = useState(false); + const showFallback = !src || imageError; + + return ( + + {showFallback ? ( + {symbol?.slice(0, 1) ?? "?"} + ) : ( + setImageError(true)} + /> + )} + + ); +} diff --git a/src/problem2/src/components/TokenSelect.jsx b/src/problem2/src/components/TokenSelect.jsx new file mode 100644 index 0000000000..93810c096e --- /dev/null +++ b/src/problem2/src/components/TokenSelect.jsx @@ -0,0 +1,64 @@ +import React, { useState, useRef, useEffect } from "react"; +import { TokenIcon } from "./TokenIcon"; + +export function TokenSelect({ tokens, selectedToken, onSelect, label, disabled }) { + const [open, setOpen] = useState(false); + const listRef = useRef(null); + + useEffect(() => { + if (!open) return; + const handleClickOutside = (e) => { + if (listRef.current && !listRef.current.contains(e.target)) setOpen(false); + }; + document.addEventListener("click", handleClickOutside); + return () => document.removeEventListener("click", handleClickOutside); + }, [open]); + + return ( +
+ + + {open && ( +
    + {tokens.map((token) => ( +
  • + +
    • + ))} +
+ )} +
+ ); +} diff --git a/src/problem2/src/hooks/useSwapForm.ts b/src/problem2/src/hooks/useSwapForm.ts new file mode 100644 index 0000000000..0b2ea796f3 --- /dev/null +++ b/src/problem2/src/hooks/useSwapForm.ts @@ -0,0 +1,100 @@ +import { useState, useMemo, useCallback, FormEvent } from "react"; +import { convertAmount, getExchangeRate } from "../utils/exchange"; +import { validateAmount } from "../utils/validation"; +import type { Token } from "../types"; + +const INITIAL_FROM_AMOUNT = ""; +const SUBMIT_DELAY_MS = 1800; + +export type SubmitState = "idle" | "loading" | "success" | "error"; + +export interface LastSwapSummary { + fromAmount: number; + fromCurrency: string; + toAmount: number; + toCurrency: string; +} + +export function useSwapForm(_tokens: Token[]) { + const [fromToken, setFromToken] = useState(null); + const [toToken, setToToken] = useState(null); + const [fromAmountRaw, setFromAmountRaw] = useState(INITIAL_FROM_AMOUNT); + const [submitState, setSubmitState] = useState("idle"); + const [lastSwapSummary, setLastSwapSummary] = useState(null); + + const fromAmount = fromAmountRaw === "" ? 0 : Number(fromAmountRaw); + const fromAmountError = validateAmount(fromAmountRaw); + + const toAmount = useMemo(() => { + if (!fromToken || !toToken || fromAmount <= 0) return 0; + return convertAmount(fromAmount, fromToken, toToken); + }, [fromToken, toToken, fromAmount]); + + const exchangeRate = useMemo(() => { + if (!fromToken || !toToken) return null; + return getExchangeRate(fromToken, toToken); + }, [fromToken, toToken]); + + const handleSwapDirection = useCallback(() => { + setFromToken(toToken); + setToToken(fromToken); + setFromAmountRaw(toAmount > 0 ? String(toAmount) : ""); + }, [fromToken, toToken, toAmount]); + + const canSubmit = + !!fromToken && + !!toToken && + fromToken.currency !== toToken.currency && + fromAmount > 0 && + !fromAmountError && + submitState !== "loading"; + + const handleSubmit = useCallback( + async (e: FormEvent) => { + e.preventDefault(); + if (!canSubmit || !fromToken || !toToken) return; + const fromAmt = fromAmountRaw === "" ? 0 : Number(fromAmountRaw); + const toAmt = convertAmount(fromAmt, fromToken, toToken); + setSubmitState("loading"); + try { + await new Promise((r) => setTimeout(r, SUBMIT_DELAY_MS)); + setLastSwapSummary({ + fromAmount: fromAmt, + fromCurrency: fromToken.currency, + toAmount: toAmt, + toCurrency: toToken.currency, + }); + setSubmitState("success"); + setFromAmountRaw(INITIAL_FROM_AMOUNT); + setTimeout(() => setSubmitState("idle"), 2000); + } catch { + setLastSwapSummary({ + fromAmount: fromAmt, + fromCurrency: fromToken.currency, + toAmount: toAmt, + toCurrency: toToken.currency, + }); + setSubmitState("error"); + setTimeout(() => setSubmitState("idle"), 3000); + } + }, + [canSubmit, fromToken, toToken, fromAmountRaw] + ); + + return { + fromToken, + toToken, + fromAmountRaw, + fromAmountError, + toAmount, + exchangeRate, + submitState, + canSubmit, + lastSwapSummary, + setFromToken, + setToToken, + setFromAmountRaw, + handleSwapDirection, + handleSubmit, + }; +} diff --git a/src/problem2/src/hooks/useTokensWithPrices.ts b/src/problem2/src/hooks/useTokensWithPrices.ts new file mode 100644 index 0000000000..7def36ca4f --- /dev/null +++ b/src/problem2/src/hooks/useTokensWithPrices.ts @@ -0,0 +1,35 @@ +import { useState, useEffect, useCallback } from "react"; +import { fetchTokensWithPrices } from "../services/priceService"; +import { preloadTokenImages } from "../utils/imagePreload"; +import type { Token } from "../types"; + +export function useTokensWithPrices(): { + tokens: Token[]; + loading: boolean; + error: string | null; + refetch: () => Promise; +} { + const [tokens, setTokens] = useState([]); + const [loading, setLoading] = useState(true); + const [error, setError] = useState(null); + + const refetch = useCallback(async () => { + setLoading(true); + setError(null); + try { + const data = await fetchTokensWithPrices(); + setTokens(data); + preloadTokenImages(data.map((t) => t.imageUrl)); + } catch (e) { + setError(e instanceof Error ? e.message : "Something went wrong"); + } finally { + setLoading(false); + } + }, []); + + useEffect(() => { + refetch(); + }, [refetch]); + + return { tokens, loading, error, refetch }; +} diff --git a/src/problem2/src/services/priceService.ts b/src/problem2/src/services/priceService.ts new file mode 100644 index 0000000000..d5b2273df4 --- /dev/null +++ b/src/problem2/src/services/priceService.ts @@ -0,0 +1,30 @@ +import type { PriceRecord, Token } from "../types"; +import { getTokenImageUrl } from "../utils/tokenIcon"; + +const PRICES_URL = "https://interview.switcheo.com/prices.json"; + +export async function fetchTokensWithPrices(): Promise { + const res = await fetch(PRICES_URL); + if (!res.ok) { + throw new Error("Failed to load token prices. Please try again."); + } + const data: PriceRecord[] = await res.json(); + + const byCurrency = new Map(); + for (const row of data) { + if (row.price == null || row.price <= 0) continue; + const existing = byCurrency.get(row.currency); + if ( + !existing || + new Date(row.date).getTime() > new Date(existing.date).getTime() + ) { + byCurrency.set(row.currency, row); + } + } + + return Array.from(byCurrency.values()).map((row) => ({ + currency: row.currency, + price: row.price, + imageUrl: getTokenImageUrl(row.currency), + })); +} diff --git a/src/problem2/src/types/index.ts b/src/problem2/src/types/index.ts new file mode 100644 index 0000000000..71b7e82c78 --- /dev/null +++ b/src/problem2/src/types/index.ts @@ -0,0 +1,11 @@ +export interface PriceRecord { + currency: string; + date: string; + price: number; +} + +export interface Token { + currency: string; + price: number; + imageUrl: string; +} diff --git a/src/problem2/src/utils/exchange.ts b/src/problem2/src/utils/exchange.ts new file mode 100644 index 0000000000..9023849810 --- /dev/null +++ b/src/problem2/src/utils/exchange.ts @@ -0,0 +1,15 @@ +import type { Token } from "../types"; + +export function getExchangeRate(fromToken: Token, toToken: Token): number { + if (!fromToken?.price || !toToken?.price) return 0; + return fromToken.price / toToken.price; +} + +export function convertAmount( + amount: number, + fromToken: Token, + toToken: Token +): number { + const rate = getExchangeRate(fromToken, toToken); + return amount * rate; +} diff --git a/src/problem2/src/utils/imagePreload.ts b/src/problem2/src/utils/imagePreload.ts new file mode 100644 index 0000000000..4e51604b4d --- /dev/null +++ b/src/problem2/src/utils/imagePreload.ts @@ -0,0 +1,14 @@ +/** + * Preload token images in background so dropdown shows them from cache. + */ + +const preloadCache = new Set(); + +export function preloadTokenImages(urls: string[], limit = 20): void { + const toLoad = urls.filter(Boolean).filter((url) => !preloadCache.has(url)); + toLoad.slice(0, limit).forEach((url) => { + preloadCache.add(url); + const img = new Image(); + img.src = url; + }); +} diff --git a/src/problem2/src/utils/tokenIcon.ts b/src/problem2/src/utils/tokenIcon.ts new file mode 100644 index 0000000000..d76ed2bc2c --- /dev/null +++ b/src/problem2/src/utils/tokenIcon.ts @@ -0,0 +1,7 @@ +const TOKEN_ICONS_BASE = + "https://raw.githubusercontent.com/Switcheo/token-icons/main/tokens"; + +export function getTokenImageUrl(currency: string): string { + if (!currency || typeof currency !== "string") return ""; + return `${TOKEN_ICONS_BASE}/${encodeURIComponent(currency)}.svg`; +} diff --git a/src/problem2/src/utils/validation.ts b/src/problem2/src/utils/validation.ts new file mode 100644 index 0000000000..5f1348d870 --- /dev/null +++ b/src/problem2/src/utils/validation.ts @@ -0,0 +1,7 @@ +export function validateAmount(value: string): string | null { + if (value === "" || value == null) return null; + const num = Number(value); + if (Number.isNaN(num)) return "Enter a valid number"; + if (num <= 0) return "Amount must be greater than 0"; + return null; +} 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.json b/src/problem2/tsconfig.json new file mode 100644 index 0000000000..1f9520c128 --- /dev/null +++ b/src/problem2/tsconfig.json @@ -0,0 +1,23 @@ +{ + "compilerOptions": { + "target": "ES2020", + "useDefineForClassFields": true, + "lib": ["ES2020", "DOM", "DOM.Iterable"], + "module": "ESNext", + "skipLibCheck": true, + "moduleResolution": "bundler", + "resolveJsonModule": true, + "isolatedModules": true, + "noEmit": true, + "jsx": "react-jsx", + "strict": true, + "noUnusedLocals": true, + "noUnusedParameters": true, + "noFallthroughCasesInSwitch": true, + "baseUrl": ".", + "paths": { + "@/*": ["src/*"] + } + }, + "include": ["src"] +} diff --git a/src/problem2/vite.config.js b/src/problem2/vite.config.js new file mode 100644 index 0000000000..86759bd80f --- /dev/null +++ b/src/problem2/vite.config.js @@ -0,0 +1,7 @@ +import { defineConfig } from "vite"; +import react from "@vitejs/plugin-react"; + +export default defineConfig({ + plugins: [react()], + root: ".", +}); diff --git a/src/problem3/ANALYSIS.md b/src/problem3/ANALYSIS.md new file mode 100644 index 0000000000..7d5ea3c9b6 --- /dev/null +++ b/src/problem3/ANALYSIS.md @@ -0,0 +1,164 @@ +# Problem 3: WalletPage — Computational Inefficiencies & Anti-Patterns + +## 1. Issues and How to Improve + +### 1.1 Bug: Wrong variable in filter (`lhsPriority`) + +**Issue:** In the filter callback, the code checks `if (lhsPriority > -99)` but `lhsPriority` is never defined in that scope. The variable that was computed is `balancePriority`. + +**Impact:** Either a ReferenceError at runtime or (if `lhsPriority` exists elsewhere) incorrect filtering. + +**Fix:** Use `balancePriority` instead of `lhsPriority` in the condition. + +--- + +### 1.2 Bug: Inverted / unclear filter logic + +**Issue:** The filter returns `true` when `balance.amount <= 0`, so only zero or negative balances are kept. Typically we want to show balances that are meaningful (e.g. positive, or at least not negative). The condition is also nested incorrectly: we only consider amount when priority > -99, which keeps zero/negative balances for known blockchains. + +**Impact:** Wrong set of balances is displayed (likely only empty/negative ones). + +**Fix:** Clarify requirements. Usually we want to **exclude** zero/negative balances: return `false` when `balance.amount <= 0`, and keep balances with `balancePriority > -99` (or whatever product rule is). Example: `return balancePriority > -99 && balance.amount > 0;` + +--- + +### 1.3 Missing `blockchain` on `WalletBalance` + +**Issue:** The code uses `balance.blockchain` but the interface `WalletBalance` only has `currency` and `amount`. TypeScript would error and runtime could be undefined. + +**Fix:** Add `blockchain` to the `WalletBalance` interface and use a union type instead of `any` for the `getPriority` argument (see type safety below). + +--- + +### 1.4 Unnecessary dependency in `useMemo` (`prices`) + +**Issue:** `sortedBalances` is memoized with dependency array `[balances, prices]`. The memoized value does not use `prices` at all. When `prices` changes, the filter/sort runs again for no reason. + +**Impact:** Extra work on every price update, more re-renders, worse performance. + +**Fix:** Remove `prices` from the dependency array: `[balances]`. + +--- + +### 1.5 Incomplete sort comparator (missing `return 0`) + +**Issue:** The sort callback returns `-1` or `1` but does not return `0` when `leftPriority === rightPriority`. In that case the function returns `undefined`, which can lead to unstable sort order and harder-to-reason-about behavior. + +**Fix:** Add `return 0` when priorities are equal: +`if (leftPriority > rightPriority) return -1; if (rightPriority > leftPriority) return 1; return 0;` + +--- + +### 1.6 Dead code and wrong data source for rows + +**Issue:** +- `formattedBalances` is computed (map that adds `formatted`) but never used. +- `rows` are built from `sortedBalances`, which is `WalletBalance[]` and has no `formatted` property. The code then uses `balance.formatted` in `WalletRow`, which would be undefined. + +**Impact:** Formatted amounts are wrong/undefined; unnecessary array allocation every render. + +**Fix:** Use `formattedBalances` when rendering rows, and derive rows from it. Optionally combine formatting with the same `useMemo` that produces sorted data to avoid two passes (see refactor). + +--- + +### 1.7 Using array index as `key` + +**Issue:** `key={index}` is used for list items. When the list is sorted/filtered, indices change and React can reuse the wrong component instance, leading to bugs and unnecessary DOM updates. + +**Fix:** Use a stable key, e.g. `key={balance.currency}` or `key={`${balance.currency}-${balance.blockchain}`}` if currency can repeat per chain. + +--- + +### 1.8 `getPriority` recreated every render + +**Issue:** `getPriority` is defined inside the component, so a new function is created on every render. It doesn’t depend on props/state. + +**Impact:** Minor CPU and memory churn; if passed to children or used in deps, can break memoization. + +**Fix:** Move `getPriority` outside the component (or to a utils file). It becomes a pure function and is not recreated. + +--- + +### 1.9 Type safety: `any` for blockchain + +**Issue:** `getPriority(blockchain: any)` violates the project rule “Avoid `any`” and loses type safety. + +**Fix:** Define a union type, e.g. +`type Blockchain = 'Osmosis' | 'Ethereum' | 'Arbitrum' | 'Zilliqa' | 'Neo';` +and use it in `WalletBalance.blockchain` and in `getPriority(blockchain: Blockchain)`. + +--- + +### 1.10 Empty/redundant `Props` interface + +**Issue:** `interface Props extends BoxProps {}` adds no members. It’s redundant. + +**Fix:** Use `BoxProps` directly as the component props type, or extend it only when you add specific props (e.g. `children`). + +--- + +### 1.11 Heavy logic inside the component + +**Issue:** Filtering, sorting, and formatting are done directly in the component. Rules say: “Business logic must not live in UI components” and “Shared logic goes to hooks”. + +**Impact:** Harder to test, reuse, and keep the component readable. + +**Fix:** Move “get filtered & sorted formatted balances” into a custom hook (e.g. `useSortedFormattedBalances(balances)`) or to a pure function in `utils`. The component only consumes the result and renders. + +--- + +### 1.12 No error handling + +**Issue:** `useWalletBalances()` and `usePrices()` are used with no loading/error handling. Rules: “Never ignore errors”, “Provide safe fallbacks”. + +**Fix:** Use error/loading states from the hooks and render loading UI or error boundaries and fallbacks (e.g. empty list, error message). + +--- + +### 1.13 Unused variable / missing definition + +**Issue:** `children` is destructured from `props` but never used. `classes.row` is used but `classes` is not defined in the snippet (likely from `makeStyles` or similar). + +**Fix:** Remove `children` if not needed, or use it in the JSX. Ensure `classes` is defined (e.g. from theme or CSS module) or replace with a string class name. + +--- + +### 1.14 Memoization of derived list for rows + +**Issue:** `formattedBalances` and `rows` are recomputed on every render. For larger lists this is unnecessary work when only `balances` or `prices` change. + +**Fix:** Use `useMemo` for the data that feeds the rows (e.g. formatted balances) with correct dependencies (`balances`, and `prices` only where needed for USD value). Optionally memoize row list or use `React.memo` on `WalletRow` for list performance. + +--- + +## 2. Summary Table + +| # | Category | Issue | Fix | +|---|-----------------|--------------------------------------------|-----| +| 1 | Bug | Wrong variable `lhsPriority` in filter | Use `balancePriority` | +| 2 | Bug | Filter keeps zero/negative balances | Keep positive (or clarify rule) | +| 3 | Type / data | `WalletBalance` missing `blockchain` | Add `blockchain` to interface | +| 4 | Performance | `prices` in useMemo deps unnecessarily | Remove `prices` from deps | +| 5 | Correctness | Sort comparator doesn’t return 0 | Return 0 when equal | +| 6 | Bug / dead code | `formattedBalances` unused; rows use wrong source | Use `formattedBalances` for rows | +| 7 | Anti-pattern | `key={index}` | Stable key (e.g. `currency`) | +| 8 | Performance | `getPriority` recreated every render | Move outside component | +| 9 | Type safety | `any` for blockchain | Use union type | +| 10| Code quality | Empty Props interface | Use BoxProps or extend meaningfully | +| 11| Architecture | Business logic in UI component | Move to hook or utils | +| 12| Robustness | No error/loading handling | Add error/loading states and fallbacks | +| 13| Clean code | Unused `children`; undefined `classes` | Remove or use; define classes | +| 14| Performance | No memo for formatted/row data | useMemo with correct deps | + +--- + +## 3. Refactored Code + +See the refactored implementation in: + +- `src/types/wallet.ts` — types and blockchain priority +- `src/utils/walletBalance.ts` — pure helpers (priority, filter, sort, format) +- `src/hooks/useSortedFormattedBalances.ts` — hook that encapsulates logic +- `src/components/WalletPage.tsx` — UI-only component + +This follows **rules.md**: separation of concerns, no `any`, reusable types, logic in hooks/utils, performance (memoization, stable keys), and room for error handling. diff --git a/src/problem3/src/components/WalletPage.tsx b/src/problem3/src/components/WalletPage.tsx new file mode 100644 index 0000000000..f29682133e --- /dev/null +++ b/src/problem3/src/components/WalletPage.tsx @@ -0,0 +1,51 @@ +import React, { useMemo } from 'react'; +import type { WalletPageProps, FormattedWalletBalance } from './types/wallet'; +import { useSortedFormattedBalances } from './hooks/useSortedFormattedBalances'; + +// Assume these hooks are provided elsewhere (e.g. from API layer) +declare function useWalletBalances(): import('./types/wallet').WalletBalance[]; +declare function usePrices(): Record; + +// Placeholder: replace with your actual WalletRow component +interface WalletRowProps { + className?: string; + key?: string; + amount: number; + usdValue: number; + formattedAmount: string; +} +function WalletRow({ className, amount, usdValue, formattedAmount }: WalletRowProps) { + return ( +
+ {formattedAmount} + ${usdValue.toFixed(2)} +
+ ); +} + +export const WalletPage: React.FC = (props) => { + const { ...rest } = props; + const balances = useWalletBalances(); + const prices = usePrices(); + + const formattedBalances = useSortedFormattedBalances(balances); + + const rows = useMemo( + () => + formattedBalances.map((balance: FormattedWalletBalance) => { + const usdValue = (prices[balance.currency] ?? 0) * balance.amount; + return ( + + ); + }), + [formattedBalances, prices] + ); + + return
{rows}
; +}; diff --git a/src/problem3/src/hooks/useSortedFormattedBalances.ts b/src/problem3/src/hooks/useSortedFormattedBalances.ts new file mode 100644 index 0000000000..a25d6797c4 --- /dev/null +++ b/src/problem3/src/hooks/useSortedFormattedBalances.ts @@ -0,0 +1,17 @@ +/** + * Hook: sorted and formatted wallet balances. + * Only depends on balances — not prices — to avoid unnecessary recalc (per rules.md §7). + */ + +import { useMemo } from 'react'; +import { getSortedFormattedBalances } from '../utils/walletBalance'; +import type { WalletBalance, FormattedWalletBalance } from '../types/wallet'; + +export function useSortedFormattedBalances( + balances: WalletBalance[] +): FormattedWalletBalance[] { + return useMemo( + () => getSortedFormattedBalances(balances), + [balances] + ); +} diff --git a/src/problem3/src/types/wallet.ts b/src/problem3/src/types/wallet.ts new file mode 100644 index 0000000000..3fd1bc1cc5 --- /dev/null +++ b/src/problem3/src/types/wallet.ts @@ -0,0 +1,31 @@ +/** + * Wallet and balance types. + * Reusable, strong typing — no `any` (per rules.md §9). + */ + +import type { ReactNode } from 'react'; + +export type Blockchain = + | 'Osmosis' + | 'Ethereum' + | 'Arbitrum' + | 'Zilliqa' + | 'Neo'; + +export interface WalletBalance { + currency: string; + amount: number; + blockchain: Blockchain; +} + +export interface FormattedWalletBalance extends WalletBalance { + formatted: string; +} + +export interface BoxProps { + className?: string; + children?: ReactNode; + [key: string]: unknown; +} + +export type WalletPageProps = BoxProps; diff --git a/src/problem3/src/utils/walletBalance.ts b/src/problem3/src/utils/walletBalance.ts new file mode 100644 index 0000000000..ba0c867d4f --- /dev/null +++ b/src/problem3/src/utils/walletBalance.ts @@ -0,0 +1,57 @@ +/** + * Pure wallet balance logic — testable, no UI (per rules.md: separation of concerns). + */ + +import type { Blockchain, WalletBalance, FormattedWalletBalance } from '../types/wallet'; + +const BLOCKCHAIN_PRIORITY: Record = { + Osmosis: 100, + Ethereum: 50, + Arbitrum: 30, + Zilliqa: 20, + Neo: 20, +}; + +const DEFAULT_PRIORITY = -99; + +export function getPriority(blockchain: Blockchain): number { + return BLOCKCHAIN_PRIORITY[blockchain] ?? DEFAULT_PRIORITY; +} + +/** + * Filter balances: known blockchain and positive amount. + * (Original kept zero/negative — likely bug; adjust rule if product needs otherwise.) + */ +export function filterBalances(balances: WalletBalance[]): WalletBalance[] { + return balances.filter((balance) => { + const priority = getPriority(balance.blockchain); + return priority > DEFAULT_PRIORITY && balance.amount > 0; + }); +} + +/** + * Sort by priority descending (higher first). + * Comparator returns -1 | 0 | 1 for stable sort. + */ +export function sortBalancesByPriority(balances: WalletBalance[]): WalletBalance[] { + return [...balances].sort((lhs, rhs) => { + const leftPriority = getPriority(lhs.blockchain); + const rightPriority = getPriority(rhs.blockchain); + if (leftPriority > rightPriority) return -1; + if (rightPriority > leftPriority) return 1; + return 0; + }); +} + +export function formatBalance(balance: WalletBalance): FormattedWalletBalance { + return { + ...balance, + formatted: balance.amount.toFixed(), + }; +} + +export function getSortedFormattedBalances(balances: WalletBalance[]): FormattedWalletBalance[] { + const filtered = filterBalances(balances); + const sorted = sortBalancesByPriority(filtered); + return sorted.map(formatBalance); +}