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"@vitejs/plugin-react": "^4.2.0" + } +} diff --git a/src/problem1/index.js b/src/problem1/index.js new file mode 100644 index 000000000..886394ac1 --- /dev/null +++ b/src/problem1/index.js @@ -0,0 +1,63 @@ +/** + * Problem 1: Three ways to sum to n + * Requirement: Write a function that calculates the sum of numbers from 1 to n + * using 3 different implementations. + */ + +// Method 1: Using a Loop (Vòng lặp) +// Time Complexity: O(n) +// Space Complexity: O(1) +function sum_to_n_v1(n) { + let sum = 0; + for (let i = 1; i <= n; i++) { + sum += i; + } + return sum; +} + +// Method 2: Using a Math Formula (Công thức toán học) +// Formula: n * (n + 1) / 2 +// Time Complexity: O(1) +// Space Complexity: O(1) +// This is the most efficient approach +function sum_to_n_v2(n) { + return (n * (n + 1)) / 2; +} + +// Method 3: Using Recursion (Đệ quy) +// Time Complexity: O(n) +// Space Complexity: O(n) due to call stack +function sum_to_n_v3(n) { + if (n <= 1) { + return n; + } + return n + sum_to_n_v3(n - 1); +} + +// Test cases to verify all implementations +console.log("Testing sum_to_n implementations:"); +console.log("-----------------------------------"); + +const testCases = [1, 5, 10, 15]; + +testCases.forEach(n => { + const result1 = sum_to_n_v1(n); + const result2 = sum_to_n_v2(n); + const result3 = sum_to_n_v3(n); + + console.log(`n = ${n}:`); + console.log(` Method 1 (Loop): ${result1}`); + console.log(` Method 2 (Formula): ${result2}`); + console.log(` Method 3 (Recursion): ${result3}`); + console.log(` All equal: ${result1 === result2 && result2 === result3 ? '✓' : '✗'}`); + console.log(); +}); + +// Export functions for use in other modules +if (typeof module !== 'undefined' && module.exports) { + module.exports = { + sum_to_n_v1, + sum_to_n_v2, + sum_to_n_v3 + }; +} diff --git a/src/problem2/README.md b/src/problem2/README.md new file mode 100644 index 000000000..9b5e8ba59 --- /dev/null +++ b/src/problem2/README.md @@ -0,0 +1,325 @@ +# Bài Toán 2: Biểu Mẫu Quy Đổi Tiền Tệ (Currency Swap Form) + +## 📋 Tổng Quan + +Đây là một ứng dụng web hiện đại để quy đổi tiền tệ với giao diện đẹp mắt và trải nghiệm người dùng tuyệt vời. Ứng dụng sử dụng API thực tế để lấy tỷ giá hối đoái cập nhật theo thời gian thực. + +## ✨ Các Tính Năng Chính + +### 1. **Quy Đổi Tiền Tệ Thực Tế** +- Tích hợp API `exchangerate-api.com` để lấy tỷ giá hối đoái cập nhật +- Hỗ trợ 10+ đồng tiền chính: USD, EUR, GBP, JPY, AUD, CAD, CHF, CNY, SEK, NZD +- Tính toán tự động khi người dùng nhập số tiền + +### 2. **Giao Diện Thân Thiện** +- Thiết kế gradient màu tím hiện đại +- Layout phản hồi (responsive) trên cả mobile và desktop +- Animations mềm mại và chuyển động tự nhiên +- Typography chuyên nghiệp với spacing hợp lý + +### 3. **Kiểm Tra Dữ Liệu Đầu Vào (Validation)** +- ✅ Kiểm tra số âm +- ✅ Kiểm tra nhập trống +- ✅ Kiểm tra tiền tệ giống nhau +- ✅ Hiển thị thông báo lỗi động + +### 4. **Trạng Thái Tải (Loading/Error States)** +- Spinner tải khi lấy tỷ giá +- Thông báo lỗi/thành công động +- Fallback sang dữ liệu mẫu nếu API không sẵn có +- Tự động làm mới tỷ giá mỗi 5 phút + +### 5. **Tương Tác Người Dùng** +- Nút "Swap" để hoán đổi tiền tệ và số tiền +- Hiển thị tỷ giá quy đổi thời gian thực +- Timestamp "Cập nhật lúc" để biết tỷ giá cũ bao lâu +- Nhập liệu theo thời gian thực (real-time) + +## 📁 Cấu Trúc File + +``` +problem2/ +├── index.html # Cấu trúc HTML chính +├── style.css # Styling và responsive design +├── script.js # Logic JavaScript và xử lý API +└── README.md # Tài liệu này +``` + +## 🚀 Cách Sử Dụng + +### Bước 1: Mở Ứng Dụng +Mở file `index.html` trong trình duyệt web bất kỳ. + +```bash +# Hoặc sử dụng Live Server (nếu có VS Code) +# Nhấp chuột phải vào index.html > Open with Live Server +``` + +### Bước 2: Nhập Số Tiền +1. Chọn tiền tệ "Từ" (From) - ví dụ: USD +2. Nhập số tiền cần quy đổi (ví dụ: 100) +3. Chọn tiền tệ "Sang" (To) - ví dụ: EUR + +### Bước 3: Xem Kết Quả +- Số tiền tương ứng sẽ tự động hiển thị +- Tỷ giá quy đổi được hiển thị dưới đây +- Nhấp "CONFIRM SWAP" để hoàn tất + +### Bước 4: Hoán Đổi Tiền Tệ (Tùy Chọn) +- Nhấp nút hình tròn có mũi tên để hoán đổi +- Tiền tệ và số tiền sẽ được đảo ngược + +## 💻 Chi Tiết Kỹ Thuật + +### HTML (`index.html`) +- Semantic HTML5 structure +- Form với validation attributes +- Accessible elements (aria-labels, proper semantics) +- Mobile-first responsive design + +**Các phần chính:** +```html +1. Card Header - Tiêu đề ứng dụng +2. Form Group 1 - Tiền tệ và số tiền cần gửi +3. Swap Button - Nút hoán đổi +4. Form Group 2 - Tiền tệ và số tiền nhận được +5. Exchange Info - Hiển thị tỷ giá +6. Alerts - Thông báo lỗi/thành công +7. Button Submit - Nút xác nhận +``` + +### CSS (`style.css`) +**Các tính năng styling:** +- Gradient backgrounds (purple theme) +- Flexbox & Grid layouts +- Smooth transitions và animations +- Responsive breakpoints cho mobile +- Custom form styling +- Loading spinner animation +- Alert animations + +**Animations:** +- `slideUp` - Card xuất hiện +- `spin` - Loading spinner quay +- `slideDown` - Alert xuất hiện +- `shake` - Lỗi rung động + +### JavaScript (`script.js`) +**Các function chính:** + +#### 1. `fetchExchangeRates()` +- Lấy tỷ giá từ API +- Xử lý lỗi gracefully +- Fallback sang dữ liệu mẫu + +#### 2. `calculateExchangeRate()` +- Tính toán số tiền đã chuyển đổi +- Kiểm tra dữ liệu nhập +- Cập nhật giao diện + +#### 3. `handleSwapCurrencies()` +- Hoán đổi tiền tệ +- Hoán đổi số tiền +- Tính toán lại + +#### 4. `handleSwap(event)` +- Xử lý gửi biểu mẫu +- Kiểm tra lỗi cuối cùng +- Hiển thị thông báo thành công + +#### 5. Validation Functions +- `showError()` - Hiển thị thông báo lỗi +- `clearErrors()` - Xóa thông báo lỗi +- `showLoading()` - Hiển thị spinner +- `showAlert()` - Hiển thị alert + +## 🔌 Tích Hợp API + +### API Sử Dụng +**ExchangeRate-API**: https://exchangerate-api.com/ + +```javascript +// Endpoint: GET https://api.exchangerate-api.com/v4/latest/{base_currency} +// Trả về: Object với rates cho tất cả tiền tệ +{ + "base": "USD", + "date": "2024-02-14", + "rates": { + "EUR": 0.92, + "GBP": 0.79, + "JPY": 149.50, + // ... + } +} +``` + +### Fallback Dữ Liệu +Nếu API không sẵn có, ứng dụng sẽ dùng dữ liệu mẫu được hardcode: +```javascript +exchangeRates = { + 'USD': 1.0, + 'EUR': 0.92, + 'GBP': 0.79, + // ... +} +``` + +## ✅ Validation Rules + +### Input Amount +- ❌ Không được âm +- ❌ Không được trống (khi submit) +- ✅ Phải là số hợp lệ +- ✅ Hỗ trợ 2 chữ số thập phân + +### Currencies +- ❌ Không được chọn cùng tiền tệ +- ✅ Phải chọn từ danh sách có sẵn + +### Thông Báo Lỗi +- "Amount cannot be negative" - Số tiền âm +- "Please enter a valid amount" - Số tiền không hợp lệ +- "Please select different currencies" - Tiền tệ giống nhau +- "Exchange rate not available" - Tiền tệ không hỗ trợ +- "Using demo rates (real rates unavailable)" - API lỗi + +## 📱 Responsive Design + +### Desktop (> 480px) +- Form 2 cột (Currency selector + Input) +- Swap button ở giữa +- Tất cả phần tử hiển thị đầy đủ + +### Mobile (≤ 480px) +- Form 1 cột (stacked) +- Tất cả input full width +- Swap button nhỏ hơn +- Spacing nhỏ hơn + +## 🎨 Màu Sắc & Thiết Kế + +### Color Palette +| Màu | Mã | Mục Đích | +|-----|-----|---------| +| Purple | #667eea | Primary gradient | +| Purple Dark | #764ba2 | Secondary gradient | +| White | #ffffff | Background card | +| Gray | #e0e0e0 | Border | +| Error | #ff6b6b | Lỗi | +| Success | #2f9e44 | Thành công | + +### Typography +- Font-family: System fonts (-apple-system, BlinkMacSystemFont, Segoe UI) +- Primary: 16px - Input fields +- Secondary: 14px - Labels, messages +- Heading: 28px - Title + +## 🔄 Luồng Dữ Liệu + +``` +User Input (Amount) + ↓ +onChange Event + ↓ +calculateExchangeRate() + ↓ +Validate Input + ↓ +Fetch Rate từ exchangeRates object + ↓ +Tính: (inputAmount / fromRate) * toRate + ↓ +Cập nhật outputAmount + ↓ +Cập nhật rate display + ↓ +Hiển thị exchange-info +``` + +## 🐛 Xử Lý Lỗi + +### Network Error +```javascript +try { + const response = await fetch(url); + if (!response.ok) throw new Error('Failed'); + // Process data +} catch (error) { + useMockData(); // Fallback + showAlert('error', 'Using demo rates'); +} +``` + +### Input Validation +```javascript +if (inputAmount < 0) { + showError('from', 'Amount cannot be negative'); + return; +} +``` + +### Currency Not Found +```javascript +if (!exchangeRates[fromCurrency]) { + showError('from', 'Exchange rate not available'); + return; +} +``` + +## ⏱️ Auto-Refresh + +Tỷ giá được tự động cập nhật mỗi 5 phút: +```javascript +setInterval(fetchExchangeRates, 5 * 60 * 1000); +``` + +## 🎯 Yêu Cầu Bài Toán - Đã Hoàn Thành + +| Yêu Cầu | Trạng Thái | +|---------|-----------| +| Giao diện Form đẹp mắt | ✅ | +| CSS/Styling chuyên nghiệp | ✅ | +| Validation đầu vào | ✅ | +| Xử lý lỗi | ✅ | +| Tương tác API | ✅ | +| Tính toán tỷ giá | ✅ | +| Loading state | ✅ | +| Error state | ✅ | +| UX tốt | ✅ | +| Responsive design | ✅ | + +## 🚀 Cải Tiến Tiềm Năng + +1. **Lịch Sử Giao Dịch** - Lưu lịch sử quy đổi +2. **Biểu Đồ Tỷ Giá** - Hiển thị biểu đồ giá 7 ngày +3. **Dark Mode** - Chế độ tối +4. **Nhiều Tiền Tệ** - Thêm hỗ trợ cho tất cả tiền tệ +5. **Offline Support** - Cache dữ liệu để sử dụng offline +6. **Thông Báo** - Push notification khi tỷ giá thay đổi + +## 📝 Ghi Chú Khác + +- **Browser Support**: Chrome, Firefox, Safari, Edge (phiên bản mới) +- **Không cần dependencies**: Thuần HTML/CSS/JavaScript +- **Mobile-first**: Thiết kế từ mobile trước +- **Accessibility**: WCAG compliance với aria-labels + +## 👨‍💻 Debug Mode + +Mở browser console (F12) để xem: +- Console logs của exchange rates +- Network requests +- JavaScript errors + +```javascript +// Logs sẽ in ra: +// "Initializing Currency Swap Form..." +// "Exchange rates updated: {...}" +// "Currency Swap Form initialized successfully!" +``` + +--- + +**Ngày tạo:** 14/02/2026 +**Phiên bản:** 1.0.0 +**Tác giả:** Code Challenge Team diff --git a/src/problem2/index.html b/src/problem2/index.html index 4058a68bf..4c50d5788 100644 --- a/src/problem2/index.html +++ b/src/problem2/index.html @@ -1,26 +1,123 @@ - + + - - Fancy Form - - + + + Currency Swap Form +
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+
+
- - diff --git a/src/problem2/script.js b/src/problem2/script.js index e69de29bb..421882857 100644 --- a/src/problem2/script.js +++ b/src/problem2/script.js @@ -0,0 +1,309 @@ +/** + * Currency Swap Form - JavaScript Logic + * Features: + * - Real-time exchange rate calculation + * - Input validation + * - Error handling + * - Loading states + * - Responsive UX + */ + +// DOM Elements +const form = document.getElementById('swap-form'); +const inputAmountEl = document.getElementById('input-amount'); +const outputAmountEl = document.getElementById('output-amount'); +const fromCurrencyEl = document.getElementById('from-currency'); +const toCurrencyEl = document.getElementById('to-currency'); +const swapBtn = document.getElementById('swap-btn'); +const confirmBtn = document.getElementById('confirm-btn'); +const exchangeInfoEl = document.getElementById('exchange-info'); +const rateTextEl = document.getElementById('rate-text'); +const lastUpdatedEl = document.getElementById('last-updated'); +const errorAlert = document.getElementById('error-alert'); +const successAlert = document.getElementById('success-alert'); +const loadingSpinner = document.getElementById('loading-spinner'); +const fromError = document.getElementById('from-error'); +const toError = document.getElementById('to-error'); + +// State +let exchangeRates = {}; +let lastUpdateTime = null; +let isLoading = false; + +/** + * Fetch exchange rates from a free API (using exchangerate-api.com or similar) + * Alternative: Use a mock data approach for development + */ +async function fetchExchangeRates() { + try { + showLoading(true); + hideAlert('error'); + hideAlert('success'); + + // Using exchangerate-api.com free API + const baseCurrency = 'USD'; + const response = await fetch( + `https://api.exchangerate-api.com/v4/latest/${baseCurrency}`, + { + method: 'GET', + headers: { + 'Accept': 'application/json' + } + } + ); + + if (!response.ok) { + throw new Error('Failed to fetch exchange rates'); + } + + const data = await response.json(); + exchangeRates = data.rates; + lastUpdateTime = new Date(); + + console.log('Exchange rates updated:', exchangeRates); + showAlert('success', 'Exchange rates loaded successfully!'); + + } catch (error) { + console.error('Error fetching rates:', error); + // Fallback to mock data + useMockData(); + showAlert('error', 'Using demo rates (real rates unavailable)'); + } finally { + showLoading(false); + } +} + +/** + * Mock exchange rates for demo/fallback purposes + */ +function useMockData() { + exchangeRates = { + 'USD': 1.0, + 'EUR': 0.92, + 'GBP': 0.79, + 'JPY': 149.50, + 'AUD': 1.53, + 'CAD': 1.36, + 'CHF': 0.88, + 'CNY': 7.24, + 'SEK': 10.50, + 'NZD': 1.68, + 'VND': 24500.00 + }; + lastUpdateTime = new Date(); + console.log('Using mock exchange rates'); +} + +/** + * Calculate the converted amount based on exchange rates + */ +function calculateExchangeRate() { + const inputAmount = parseFloat(inputAmountEl.value) || 0; + const fromCurrency = fromCurrencyEl.value; + const toCurrency = toCurrencyEl.value; + + // Clear previous errors + clearErrors(); + + // Validation + if (inputAmount < 0) { + showError('from', 'Amount cannot be negative'); + outputAmountEl.value = ''; + exchangeInfoEl.style.display = 'none'; + return; + } + + if (inputAmount === 0) { + outputAmountEl.value = ''; + exchangeInfoEl.style.display = 'none'; + return; + } + + if (!exchangeRates[fromCurrency] || !exchangeRates[toCurrency]) { + showError('from', 'Exchange rate not available for selected currency'); + outputAmountEl.value = ''; + exchangeInfoEl.style.display = 'none'; + return; + } + + // Calculate: Convert to base (USD) then to target currency + const amountInUSD = inputAmount / exchangeRates[fromCurrency]; + const convertedAmount = amountInUSD * exchangeRates[toCurrency]; + + // Format to 2 decimal places + outputAmountEl.value = convertedAmount.toFixed(2); + + // Update exchange rate display + updateExchangeRateDisplay(fromCurrency, toCurrency); + exchangeInfoEl.style.display = 'block'; +} + +/** + * Update the exchange rate display information + */ +function updateExchangeRateDisplay(from, to) { + const rate = (exchangeRates[to] / exchangeRates[from]).toFixed(4); + rateTextEl.textContent = `1 ${from} = ${rate} ${to}`; + + if (lastUpdateTime) { + const now = new Date(); + const diffSeconds = Math.floor((now - lastUpdateTime) / 1000); + + if (diffSeconds < 60) { + lastUpdatedEl.textContent = 'Updated just now'; + } else if (diffSeconds < 3600) { + const minutes = Math.floor(diffSeconds / 60); + lastUpdatedEl.textContent = `Updated ${minutes}m ago`; + } else { + const hours = Math.floor(diffSeconds / 3600); + lastUpdatedEl.textContent = `Updated ${hours}h ago`; + } + } +} + +/** + * Swap the from and to currencies + */ +function handleSwapCurrencies() { + const tempCurrency = fromCurrencyEl.value; + fromCurrencyEl.value = toCurrencyEl.value; + toCurrencyEl.value = tempCurrency; + + // Swap amounts if input has a value + if (inputAmountEl.value) { + const tempAmount = inputAmountEl.value; + inputAmountEl.value = outputAmountEl.value; + outputAmountEl.value = tempAmount; + } + + calculateExchangeRate(); + inputAmountEl.focus(); +} + +/** + * Handle form submission + */ +function handleSwap(event) { + event.preventDefault(); + + const inputAmount = parseFloat(inputAmountEl.value); + const outputAmount = parseFloat(outputAmountEl.value); + const fromCurrency = fromCurrencyEl.value; + const toCurrency = toCurrencyEl.value; + + // Validation + clearErrors(); + let isValid = true; + + if (!inputAmount || inputAmount <= 0) { + showError('from', 'Please enter a valid amount'); + isValid = false; + } + + if (fromCurrency === toCurrency) { + showError('to', 'Please select different currencies'); + isValid = false; + } + + if (!isValid) { + return false; + } + + // Show success message + showAlert( + 'success', + `Swapping ${inputAmount.toFixed(2)} ${fromCurrency} for ${outputAmount.toFixed(2)} ${toCurrency}` + ); + + // Reset form after 2 seconds + setTimeout(() => { + form.reset(); + outputAmountEl.value = ''; + exchangeInfoEl.style.display = 'none'; + hideAlert('success'); + clearErrors(); + }, 2000); + + return false; +} + +/** + * Show error message for a field + */ +function showError(field, message) { + const errorElement = field === 'from' ? fromError : toError; + errorElement.textContent = message; + errorElement.style.display = 'block'; +} + +/** + * Clear all error messages + */ +function clearErrors() { + fromError.textContent = ''; + fromError.style.display = 'none'; + toError.textContent = ''; + toError.style.display = 'none'; +} + +/** + * Show loading spinner + */ +function showLoading(show) { + isLoading = show; + loadingSpinner.style.display = show ? 'block' : 'none'; + confirmBtn.disabled = show; +} + +/** + * Show alert message + */ +function showAlert(type, message) { + const alertEl = type === 'error' ? errorAlert : successAlert; + alertEl.textContent = message; + alertEl.style.display = 'flex'; +} + +/** + * Hide alert message + */ +function hideAlert(type) { + const alertEl = type === 'error' ? errorAlert : successAlert; + alertEl.style.display = 'none'; +} + +/** + * Event Listeners + */ +inputAmountEl.addEventListener('input', calculateExchangeRate); +inputAmountEl.addEventListener('change', calculateExchangeRate); +fromCurrencyEl.addEventListener('change', calculateExchangeRate); +toCurrencyEl.addEventListener('change', calculateExchangeRate); +swapBtn.addEventListener('click', handleSwapCurrencies); +form.addEventListener('submit', handleSwap); + +/** + * Initialize the application + */ +function initialize() { + console.log('Initializing Currency Swap Form...'); + + // Set default currency pair + fromCurrencyEl.value = 'USD'; + toCurrencyEl.value = 'EUR'; + + // Fetch exchange rates on page load + fetchExchangeRates(); + + // Refresh exchange rates every 5 minutes + setInterval(fetchExchangeRates, 5 * 60 * 1000); + + console.log('Currency Swap Form initialized successfully!'); +} + +// Start when DOM is ready +if (document.readyState === 'loading') { + document.addEventListener('DOMContentLoaded', initialize); +} else { + initialize(); +} diff --git a/src/problem2/style.css b/src/problem2/style.css index 915af91c7..c2b86c054 100644 --- a/src/problem2/style.css +++ b/src/problem2/style.css @@ -1,8 +1,387 @@ +* { + margin: 0; + padding: 0; + box-sizing: border-box; +} + body { display: flex; flex-direction: row; align-items: center; justify-content: center; min-width: 360px; - font-family: Arial, Helvetica, sans-serif; + min-height: 100vh; + font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif; + background: linear-gradient(135deg, #5dade2 0%, #3498db 100%); + padding: 20px; +} + +.container { + width: 100%; + max-width: 500px; +} + +.card { + background: white; + border-radius: 20px; + box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15); + overflow: hidden; + animation: slideUp 0.5s ease-out; +} + +@keyframes slideUp { + from { + opacity: 0; + transform: translateY(20px); + } + to { + opacity: 1; + transform: translateY(0); + } +} + +.card-header { + background: linear-gradient(135deg, #5dade2 0%, #3498db 100%); + color: white; + padding: 30px; + text-align: center; +} + +.card-header h1 { + font-size: 28px; + font-weight: 700; + margin-bottom: 8px; +} + +.subtitle { + font-size: 14px; + opacity: 0.9; + font-weight: 300; +} + +form { + padding: 30px; +} + +.form-group { + margin-bottom: 20px; +} + +label { + display: block; + font-size: 13px; + font-weight: 600; + color: #333; + margin-bottom: 8px; + text-transform: uppercase; + letter-spacing: 0.5px; +} + +.input-wrapper { + display: grid; + grid-template-columns: 120px 1fr; + gap: 10px; + align-items: center; +} + +.currency-selector { + position: relative; +} + +select { + width: 100%; + padding: 12px; + border: 2px solid #e0e0e0; + border-radius: 8px; + font-size: 14px; + font-weight: 500; + background: white; + cursor: pointer; + transition: all 0.3s ease; + color: #333; + appearance: none; + background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%235dade2' d='M6 9L1 4h10z'/%3E%3C/svg%3E"); + background-repeat: no-repeat; + background-position: right 10px center; + padding-right: 30px; +} + +select:hover { + border-color: #5dade2; + box-shadow: 0 0 0 3px rgba(93, 173, 226, 0.1); +} + +select:focus { + outline: none; + border-color: #5dade2; + box-shadow: 0 0 0 3px rgba(93, 173, 226, 0.15); +} + +input[type="number"] { + width: 100%; + padding: 12px 16px; + border: 2px solid #e0e0e0; + border-radius: 8px; + font-size: 16px; + font-weight: 500; + color: #333; + transition: all 0.3s ease; + font-family: 'Courier New', monospace; +} + +input[type="number"]:focus { + outline: none; + border-color: #5dade2; + box-shadow: 0 0 0 3px rgba(93, 173, 226, 0.15); +} + +input[type="number"]:invalid { + border-color: #ff6b6b; +} + +input[type="number"]:read-only { + background-color: #f5f5f5; + color: #666; +} + +input[type="number"]::placeholder { + color: #999; +} + +/* Remove number input spinners */ +input[type="number"]::-webkit-outer-spin-button, +input[type="number"]::-webkit-inner-spin-button { + -webkit-appearance: none; + margin: 0; +} + +input[type="number"][type=number] { + -moz-appearance: textfield; +} + +.error-message { + font-size: 12px; + color: #ff6b6b; + margin-top: 6px; + min-height: 18px; + animation: shake 0.3s ease-in-out; +} + +@keyframes shake { + 0%, 100% { transform: translateX(0); } + 25% { transform: translateX(-5px); } + 75% { transform: translateX(5px); } +} + +.swap-button { + width: 50px; + height: 50px; + border: none; + border-radius: 50%; + background: linear-gradient(135deg, #5dade2 0%, #3498db 100%); + color: white; + cursor: pointer; + display: flex; + align-items: center; + justify-content: center; + margin: 20px auto; + transition: all 0.3s ease; + box-shadow: 0 4px 15px rgba(93, 173, 226, 0.3); +} + +.swap-button:hover { + transform: scale(1.1) rotate(180deg); + box-shadow: 0 6px 20px rgba(93, 173, 226, 0.4); +} + +.swap-button:active { + transform: scale(0.95); +} + +.swap-button svg { + display: block; +} + +.exchange-info { + background: #f0f7ff; + border-left: 4px solid #5dade2; + padding: 12px 16px; + border-radius: 8px; + margin-bottom: 20px; + animation: slideDown 0.3s ease-out; +} + +@keyframes slideDown { + from { + opacity: 0; + max-height: 0; + } + to { + opacity: 1; + max-height: 200px; + } +} + +.rate-display { + display: flex; + justify-content: space-between; + align-items: center; + flex-wrap: wrap; + gap: 8px; +} + +#rate-text { + font-size: 14px; + font-weight: 600; + color: #5dade2; +} + +.last-updated { + font-size: 12px; + color: #999; + font-style: italic; +} + +.loading-spinner { + width: 40px; + height: 40px; + border: 4px solid #e0e0e0; + border-top-color: #5dade2; + border-radius: 50%; + animation: spin 0.8s linear infinite; + margin: 20px auto; +} + +@keyframes spin { + to { + transform: rotate(360deg); + } +} + +.alert { + padding: 12px 16px; + border-radius: 8px; + margin-bottom: 20px; + font-size: 14px; + display: flex; + align-items: center; + gap: 10px; + animation: slideDown 0.3s ease-out; +} + +.alert-error { + background-color: #ffe0e0; + color: #c92a2a; + border-left: 4px solid #c92a2a; +} + +.alert-success { + background-color: #d3f9d8; + color: #2f9e44; + border-left: 4px solid #2f9e44; +} + +.alert::before { + content: ""; + display: block; + width: 20px; + height: 20px; + flex-shrink: 0; +} + +.alert-error::before { + background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23c92a2a' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='10'%3E%3C/circle%3E%3Cline x1='12' y1='8' x2='12' y2='12'%3E%3C/line%3E%3Ccircle cx='12' cy='16' r='0.5' fill='%23c92a2a'%3E%3C/circle%3E%3C/svg%3E"); + background-size: contain; + background-repeat: no-repeat; +} + +.alert-success::before { + background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232f9e44' stroke-width='2'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E"); + background-size: contain; + background-repeat: no-repeat; +} + +.btn { + width: 100%; + padding: 14px 20px; + border: none; + border-radius: 8px; + font-size: 15px; + font-weight: 700; + cursor: pointer; + transition: all 0.3s ease; + text-transform: uppercase; + letter-spacing: 1px; + display: flex; + align-items: center; + justify-content: center; + gap: 8px; +} + +.btn-primary { + background: linear-gradient(135deg, #5dade2 0%, #3498db 100%); + color: white; + box-shadow: 0 4px 15px rgba(93, 173, 226, 0.3); +} + +.btn-primary:hover { + transform: translateY(-2px); + box-shadow: 0 6px 20px rgba(93, 173, 226, 0.4); +} + +.btn-primary:active { + transform: translateY(0); +} + +.btn-primary:disabled { + opacity: 0.6; + cursor: not-allowed; + transform: none; +} + +.footer { + border-top: 1px solid #e0e0e0; + padding: 16px 30px; + text-align: center; + background: #fafafa; + color: #999; +} + +.footer small { + font-size: 12px; +} + +/* Responsive Design */ +@media (max-width: 480px) { + .card-header { + padding: 20px; + } + + .card-header h1 { + font-size: 24px; + } + + form { + padding: 20px; + } + + .input-wrapper { + grid-template-columns: 1fr; + gap: 8px; + } + + .currency-selector { + grid-column: 1; + } + + input[type="number"] { + grid-column: 1; + } + + .swap-button { + width: 45px; + height: 45px; + margin: 15px auto; + } } + diff --git a/src/problem3/ANALYSIS.md b/src/problem3/ANALYSIS.md new file mode 100644 index 000000000..2d64f2772 --- /dev/null +++ b/src/problem3/ANALYSIS.md @@ -0,0 +1,476 @@ +# Bài Toán 3: Phân Tích và Refactoring Code React Lộn Xộn + +## 📋 Tóm Tắt Vấn Đề + +Code React dưới đây chứa nhiều lỗi về TypeScript, logic, performance và code quality. Nhiệm vụ là xác định các vấn đề và cung cấp phiên bản refactored. + +--- + +## 🔴 Danh Sách Các Lỗi Tìm Thấy + +### **1. TypeScript Issues (Loại 1, 2, 3)** + +#### ❌ Lỗi 1.1: Parameter có type `any` +**Code lỗi:** +```typescript +const getPriority = (blockchain: any): number => { +``` + +**Vấn đề:** +- Sử dụng `any` mất đi lợi ích của TypeScript +- Không có type safety cho input +- Khó maintain khi refactor + +**Cách sửa:** +```typescript +type Blockchain = 'Osmosis' | 'Ethereum' | 'Arbitrum' | 'Zilliqa' | 'Neo'; + +const getPriority = (blockchain: Blockchain): number => { +``` + +--- + +#### ❌ Lỗi 1.2: Thiếu Interface cho `Props` +**Code lỗi:** +```typescript +interface Props extends BoxProps { + // Trống, không định nghĩa gì +} +``` + +**Vấn đề:** +- `BoxProps` không được import hoặc định nghĩa +- Không rõ component này cần props gì +- Không thể type-check các props được truyền vào + +**Cách sửa:** +```typescript +interface Props extends BoxProps { + // Thêm các props cần thiết + // Ví dụ: nếu cần +} +// Hoặc nếu không extend gì: +type Props = React.HTMLAttributes; +``` + +--- + +#### ❌ Lỗi 1.3: Destructuring không đúng +**Code lỗi:** +```typescript +const { children, ...rest } = props; +// Nhưng children không được sử dụng +// rest được sử dụng nhưng không rõ là gì +``` + +**Cách sửa:** +```typescript +// Nếu không cần children, đừng destructure nó +const WalletPage: React.FC = (props: Props) => { + // hoặc + const WalletPage: React.FC = ({ ...rest }: Props) => { +``` + +--- + +### **2. Logic Errors (Logic Sai)** + +#### ❌ Lỗi 2.1: Biến không được định nghĩa - `lhsPriority` +**Code lỗi:** +```typescript +const sortedBalances = useMemo(() => { + return balances.filter((balance: WalletBalance) => { + const balancePriority = getPriority(balance.blockchain); + if (lhsPriority > -99) { // ❌ lhsPriority không tồn tại! + if (balance.amount <= 0) { + return true; + } + } + return false + }) +``` + +**Vấn đề:** +- `lhsPriority` được sử dụng nhưng không được định nghĩa +- Có lẽ ý định là `balancePriority` +- Code sẽ throw ReferenceError khi chạy + +**Cách sửa:** +```typescript +const balancePriority = getPriority(balance.blockchain); +if (balancePriority > -99) { // ✅ Dùng đúng biến + if (balance.amount <= 0) { + return true; + } +} +``` + +--- + +#### ❌ Lỗi 2.2: Logic Filter Sai (Return True khi amount <= 0) +**Code lỗi:** +```typescript +if (balancePriority > -99) { + if (balance.amount <= 0) { + return true; // ❌ Filter LỌC RA những cái amount <= 0 + } +} +return false +``` + +**Vấn đề:** +- Ý định có lẽ là lọc những balance **có giá trị dương** +- Nhưng logic này lọc RA những cái **âm hoặc bằng 0** +- Ngược với ý định (inverted logic) + +**Cách sửa:** +```typescript +// Option 1: Lọc những cái amount > 0 +if (balancePriority > -99) { + return balance.amount > 0; // ✅ Keep những cái dương +} +return false; + +// Option 2: Rõ ràng hơn +const hasValidPriority = balancePriority > -99; +const hasValidAmount = balance.amount > 0; +return hasValidPriority && hasValidAmount; +``` + +--- + +#### ❌ Lỗi 2.3: Sort Callback không return 0 +**Code lỗi:** +```typescript +.sort((lhs: WalletBalance, rhs: WalletBalance) => { + const leftPriority = getPriority(lhs.blockchain); + const rightPriority = getPriority(rhs.blockchain); + if (leftPriority > rightPriority) { + return -1; + } else if (rightPriority > leftPriority) { + return 1; + } + // ❌ Không return gì khi priority bằng nhau (undefined) +}); +``` + +**Vấn đề:** +- Sort callback phải return `-1`, `0`, hoặc `1` +- Khi bằng nhau, không return sẽ trả về `undefined` +- Behavior không xác định, có thể gây bug + +**Cách sửa:** +```typescript +.sort((lhs: WalletBalance, rhs: WalletBalance) => { + const leftPriority = getPriority(lhs.blockchain); + const rightPriority = getPriority(rhs.blockchain); + + if (leftPriority > rightPriority) { + return -1; + } else if (rightPriority > leftPriority) { + return 1; + } + return 0; // ✅ Return 0 khi bằng nhau +}); + +// Hoặc ngắn gọn hơn: +return rightPriority - leftPriority; // Descending order +``` + +--- + +### **3. Performance Issues (Hiệu Năng Kém)** + +#### ❌ Lỗi 3.1: `useMemo` phụ thuộc vào `prices` nhưng không sử dụng +**Code lỗi:** +```typescript +const sortedBalances = useMemo(() => { + return balances.filter(...).sort(...); +}, [balances, prices]); // ❌ prices trong dependency nhưng không dùng +``` + +**Vấn đề:** +- `prices` được thêm vào dependency array nhưng không được sử dụng trong logic +- Mỗi khi `prices` thay đổi, `useMemo` tính toán lại dù không cần +- Làm giảm performance + +**Cách sửa:** +```typescript +const sortedBalances = useMemo(() => { + return balances.filter(...).sort(...); +}, [balances]); // ✅ Chỉ phụ thuộc vào balances +``` + +--- + +#### ❌ Lỗi 3.2: `formattedBalances` được tạo nhưng không sử dụng +**Code lỗi:** +```typescript +const formattedBalances = sortedBalances.map((balance: WalletBalance) => { + return { + ...balance, + formatted: balance.amount.toFixed() + } +}) + +const rows = sortedBalances.map((balance: FormattedWalletBalance, index: number) => { + // ❌ Map từ sortedBalances, không phải formattedBalances + // ❌ balance không có property 'formatted' +``` + +**Vấn đề:** +- `formattedBalances` được tạo nhưng không sử dụng +- `rows` map từ `sortedBalances` (không có property `formatted`) +- Type-checking sẽ fail + +**Cách sửa:** +```typescript +// Xóa formattedBalances không cần thiết, hoặc: +const rows = sortedBalances.map((balance: WalletBalance, index: number) => { + const usdValue = prices[balance.currency] * balance.amount; + const formatted = balance.amount.toFixed(2); // ✅ Format inline + return ( + + ) +}) +``` + +--- + +#### ❌ Lỗi 3.3: `toFixed()` không có tham số (sẽ là integer) +**Code lỗi:** +```typescript +formatted: balance.amount.toFixed() // ❌ No decimal places +``` + +**Vấn đề:** +- `toFixed()` mà không truyền tham số sẽ làm tròn thành integer +- Ví dụ: `123.456.toFixed()` → `"123"` +- Mất đi thông tin small balances + +**Cách sửa:** +```typescript +formatted: balance.amount.toFixed(2) // ✅ 2 decimal places +``` + +--- + +### **4. Code Quality & Anti-patterns (Chất Lượng Code)** + +#### ❌ Lỗi 4.1: Sử dụng `index` làm React key +**Code lỗi:** +```typescript +key={index} // ❌ Anti-pattern +``` + +**Vấn đề:** +- Nếu list được sắp xếp/lọc lại, index sẽ thay đổi +- React sẽ re-render components không cần thiết +- Có thể gây bug với component state + +**Cách sửa:** +```typescript +key={balance.currency} // ✅ Use unique, stable identifier +``` + +--- + +#### ❌ Lỗi 4.2: Tên biến không rõ ràng +**Code lỗi:** +```typescript +.sort((lhs: WalletBalance, rhs: WalletBalance) => { + // lhs = left-hand side (tên viết tắt kỳ lạ) + // rhs = right-hand side (tên viết tắt kỳ lạ) +``` + +**Vấn đề:** +- Tên biến kỳ lạ, không rõ ý nghĩa +- Khó đọc code + +**Cách sửa:** +```typescript +.sort((leftBalance: WalletBalance, rightBalance: WalletBalance) => { + // Hoặc: + .sort((a: WalletBalance, b: WalletBalance) => { +``` + +--- + +#### ❌ Lỗi 4.3: Biến `balancePriority` tạo nhưng không dùng +**Code lỗi:** +```typescript +const balancePriority = getPriority(balance.blockchain); +if (lhsPriority > -99) { // ❌ Sử dụng biến khác +``` + +**Vấn đề:** +- Dead code +- Gây confusing + +**Cách sửa:** +```typescript +const balancePriority = getPriority(balance.blockchain); +if (balancePriority > -99) { // ✅ Dùng đúng biến +``` + +--- + +#### ❌ Lỗi 4.4: Cấu trúc if-else có thể simplify +**Code lỗi:** +```typescript +if (balancePriority > -99) { + if (balance.amount <= 0) { + return true; + } +} +return false +``` + +**Cách sửa:** +```typescript +// Rõ ràng hơn: +return balancePriority > -99 && balance.amount > 0; +``` + +--- + +## ✅ Refactored Code (Phiên Bản Sửa Lại) + +```typescript +// ===== TYPES & INTERFACES ===== +type Blockchain = 'Osmosis' | 'Ethereum' | 'Arbitrum' | 'Zilliqa' | 'Neo'; + +interface WalletBalance { + blockchain: Blockchain; + currency: string; + amount: number; +} + +interface FormattedWalletBalance extends WalletBalance { + formatted: string; + usdValue: number; +} + +interface Props extends BoxProps { + // Define any additional props here if needed +} + +// ===== HELPER FUNCTIONS ===== + +/** + * Get priority for blockchain + * Higher priority = displayed first + */ +const getPriority = (blockchain: Blockchain): number => { + const priorityMap: Record = { + 'Osmosis': 100, + 'Ethereum': 50, + 'Arbitrum': 30, + 'Zilliqa': 20, + 'Neo': 20, + }; + + return priorityMap[blockchain] ?? -99; +}; + +// ===== MAIN COMPONENT ===== +const WalletPage: React.FC = (props: Props) => { + const { ...rest } = props; + + // Hooks + const balances = useWalletBalances(); + const prices = usePrices(); + + // Memoized: Filter and sort balances + const sortedBalances = useMemo(() => { + return balances + .filter((balance: WalletBalance) => { + const priority = getPriority(balance.blockchain); + return priority > -99 && balance.amount > 0; + }) + .sort((a: WalletBalance, b: WalletBalance) => { + const aPriority = getPriority(a.blockchain); + const bPriority = getPriority(b.blockchain); + return bPriority - aPriority; // Descending + }); + }, [balances]); + + // Memoized: Format and calculate USD values + const formattedBalances = useMemo(() => { + return sortedBalances.map((balance: WalletBalance): FormattedWalletBalance => { + const usdValue = (prices[balance.currency] ?? 0) * balance.amount; + return { + ...balance, + formatted: balance.amount.toFixed(2), + usdValue, + }; + }); + }, [sortedBalances, prices]); + + // Render rows + const rows = formattedBalances.map((balance: FormattedWalletBalance) => ( + + )); + + return ( +
+ {rows} +
+ ); +}; + +export default WalletPage; +``` + +--- + +## 📊 Bảng So Sánh: Code Cũ vs Code Mới + +| Vấn Đề | Code Cũ | Code Mới | Lợi Ích | +|--------|---------|---------|---------| +| Type `blockchain` | `any` | `Blockchain` type union | Type safety, autocomplete | +| Biến không được định | `lhsPriority` | `balancePriority` hoặc `aPriority` | Không runtime error | +| Filter logic | Inverted (sai) | `priority > -99 && amount > 0` | Logic đúng | +| Sort return | `undefined` | `return 0` / `bPriority - aPriority` | Consistent behavior | +| useMemo dependency | `[balances, prices]` | `[balances]` | Tránh re-calculate không cần | +| formattedBalances | Tạo không dùng | Dùng trong map | Không dead code | +| toFixed() | Không tham số | `toFixed(2)` | Format đúng | +| React key | `index` | `balance.currency` | Tránh re-render | +| Tên biến | `lhs, rhs` | `a, b` hoặc `leftBalance, rightBalance` | Dễ đọc hơn | +| Priority map | Switch case | `Record` | Dễ extend | + +--- + +## 🎯 Tóm Tắt Cải Tiến + +| Hạng Mục | Số Lỗi | Tình Trạng | +|---------|--------|-----------| +| TypeScript Issues | 3 | ✅ Sửa | +| Logic Errors | 4 | ✅ Sửa | +| Performance | 3 | ✅ Sửa | +| Code Quality | 4 | ✅ Sửa | +| **Total** | **14** | **✅ All Fixed** | + +--- + +## 🔑 Key Takeaways + +1. **Luôn định nghĩa type rõ ràng** - Không dùng `any` +2. **Check biến trước khi sử dụng** - Tránh ReferenceError +3. **Logic test trước khi code** - Filter/sort phải đúng ý định +4. **Cleanup unused code** - Dead code làm confusing +5. **Use stable keys trong loops** - Tránh re-render không cần +6. **Optimize dependency arrays** - useMemo/useCallback phải đúng +7. **Improve readability** - Tên biến rõ ràng, code cấu trúc tốt + diff --git a/src/problem3/README.md b/src/problem3/README.md new file mode 100644 index 000000000..3582cf8d7 --- /dev/null +++ b/src/problem3/README.md @@ -0,0 +1,232 @@ +# Bài Toán 3: Phân Tích & Refactoring Code React Lộn Xộn + +## 📋 Tóm Tắt + +Đây là bài tập refactoring một component React viết tệ. Công việc yêu cầu: +1. ✅ Xác định tất cả lỗi (inefficiencies và anti-patterns) +2. ✅ Giải thích cách sửa từng lỗi +3. ✅ Cung cấp phiên bản code refactored + +## 📁 Các File + +| File | Mô Tả | +|------|-------| +| `ANALYSIS.md` | **Phân tích chi tiết 14 lỗi** - giải thích vấn đề và cách sửa | +| `WalletPage.messy.tsx` | Code gốc lộn xộn (đánh dấu lỗi) | +| `WalletPage.refactored.tsx` | Code đã refactor - sạch và tối ưu | +| `README.md` | File này | + +## 🔴 Tóm Tắt 14 Lỗi Phát Hiện + +### **TypeScript Issues (3 lỗi)** +- ❌ Parameter `blockchain: any` - không type safety +- ❌ `Props extends BoxProps` - BoxProps không được định nghĩa +- ❌ Destructure `children` nhưng không dùng + +### **Logic Errors (4 lỗi)** +- ❌ Sử dụng `lhsPriority` - biến không tồn tại → ReferenceError +- ❌ Filter logic inverted - lọc những cái amount <= 0 (sai ý định) +- ❌ Sort callback không return 0 - undefined behavior +- ❌ Biến `balancePriority` tạo nhưng không dùng (dead code) + +### **Performance Issues (3 lỗi)** +- ❌ `useMemo` phụ thuộc vào `prices` nhưng không sử dụng +- ❌ `formattedBalances` tạo nhưng không sử dụng +- ❌ `toFixed()` không tham số - format sai (integer thay vì 2 decimal) + +### **Code Quality (4 lỗi)** +- ❌ Tên biến `lhs`, `rhs` - khó đọc +- ❌ Sử dụng `index` làm React key - anti-pattern +- ❌ Map từ `sortedBalances` nhưng type là `FormattedWalletBalance` - type mismatch +- ❌ Cấu trúc code có thể rearrange + +## ✅ Cải Tiến Chính + +### Trước (Code Lộn Xộn) +```typescript +// ❌ any type +const getPriority = (blockchain: any): number => { + +// ❌ lhsPriority không tồn tại +if (lhsPriority > -99) { + +// ❌ Logic inverted +if (balance.amount <= 0) { + return true; // Filter OUT positive balances! +} + +// ❌ useMemo dependency sai +}, [balances, prices]); // prices not used + +// ❌ index key +key={index} +``` + +### Sau (Code Clean) +```typescript +// ✅ Proper type union +type Blockchain = 'Osmosis' | 'Ethereum' | 'Arbitrum' | 'Zilliqa' | 'Neo'; + +// ✅ Using correct variable +const priority = getPriority(balance.blockchain); + +// ✅ Logic fixed +return hasValidPriority && hasPositiveAmount; + +// ✅ Correct dependency +}, [balances]); // Only balances + +// ✅ Stable key +key={balance.currency} +``` + +## 📊 Chi Tiết So Sánh + +### Performance +| Aspect | Before | After | +|--------|--------|-------| +| useMemo unnecessary recalculations | ❌ Yes (prices in deps) | ✅ No | +| Dead code | ❌ formattedBalances unused | ✅ Removed | +| React re-renders | ❌ More (index key) | ✅ Less | + +### Type Safety +| Aspect | Before | After | +|--------|--------|-------| +| `blockchain` type | ❌ `any` | ✅ Union type | +| ReferenceError bugs | ❌ Yes (lhsPriority) | ✅ No | +| Type mismatch | ❌ Yes (sortedBalances vs FormattedWalletBalance) | ✅ No | + +### Code Quality +| Aspect | Before | After | +|--------|--------|-------| +| Variable names | ❌ `lhs`, `rhs` | ✅ Clear names | +| Logic clarity | ❌ Inverted filter | ✅ Clear intent | +| Dead code | ❌ Yes | ✅ No | +| Comments | ❌ No | ✅ Detailed JSDoc | + +## 🎓 Key Learnings + +### 1. **Type Safety First** +```typescript +// ❌ Bad +const getPriority = (blockchain: any): number => { + +// ✅ Good +type Blockchain = 'Osmosis' | 'Ethereum' | 'Arbitrum' | 'Zilliqa' | 'Neo'; +const getPriority = (blockchain: Blockchain): number => { +``` + +### 2. **Verify Variables Exist** +```typescript +// ❌ Bad - lhsPriority không tồn tại +if (lhsPriority > -99) { + +// ✅ Good +const priority = getPriority(balance.blockchain); +if (priority > -99) { +``` + +### 3. **useMemo Dependency Optimization** +```typescript +// ❌ Bad - prices not used +}, [balances, prices]); + +// ✅ Good - only dependencies used +}, [balances]); +``` + +### 4. **Filter Logic Clarity** +```typescript +// ❌ Bad - confusing logic +if (lhsPriority > -99) { + if (balance.amount <= 0) { + return true; + } +} +return false; + +// ✅ Good - clear intent +return balancePriority > -99 && balance.amount > 0; +``` + +### 5. **React Key Best Practice** +```typescript +// ❌ Anti-pattern +key={index} + +// ✅ Best practice - use unique, stable identifier +key={balance.currency} +``` + +### 6. **Clean Up Dead Code** +```typescript +// ❌ Bad - unused variable +const formattedBalances = sortedBalances.map(...); + +// ✅ Good - use or remove +const formattedBalances = useMemo(() => { + return sortedBalances.map(...); +}, [sortedBalances, prices]); +``` + +### 7. **Format Numbers Correctly** +```typescript +// ❌ Bad - loses decimal places +formatted: balance.amount.toFixed() // → "123" + +// ✅ Good - maintain precision +formatted: balance.amount.toFixed(2) // → "123.45" +``` + +## 🚀 How to Use These Files + +### 1. Study the Analysis +```bash +# Read detailed explanation of each issue +cat ANALYSIS.md +``` + +### 2. Compare Code Versions +```bash +# View original messy code with inline comments +cat WalletPage.messy.tsx + +# View refactored clean code +cat WalletPage.refactored.tsx +``` + +### 3. Key Differences to Note +- Types and interfaces +- Filter and sort logic +- useMemo dependencies +- Variable naming +- React keys +- Code comments + +## 📝 Summary Table + +| Category | Issues Found | Status | +|----------|--------------|--------| +| TypeScript Issues | 3 | ✅ Fixed | +| Logic Errors | 4 | ✅ Fixed | +| Performance | 3 | ✅ Optimized | +| Code Quality | 4 | ✅ Improved | +| **Total** | **14** | **✅ All Resolved** | + +## 🎯 Main Takeaways + +1. ✅ Always use proper TypeScript types (never `any`) +2. ✅ Define all variables before using them +3. ✅ Test filter/sort logic carefully +4. ✅ Keep useMemo dependencies minimal and accurate +5. ✅ Use stable, unique identifiers for React keys +6. ✅ Remove dead code +7. ✅ Use clear, descriptive variable names +8. ✅ Add comments explaining complex logic + +--- + +**Created:** February 14, 2026 +**Component Type:** React Functional Component with TypeScript +**Frameworks:** React, TypeScript +**Status:** ✅ Analysis Complete & Code Refactored diff --git a/src/problem3/WalletPage.messy.tsx b/src/problem3/WalletPage.messy.tsx new file mode 100644 index 000000000..db776e29f --- /dev/null +++ b/src/problem3/WalletPage.messy.tsx @@ -0,0 +1,119 @@ +/** + * Problem 3: Messy React Code - ORIGINAL (WITH ISSUES) + * + * This file contains the original code with all its issues. + * See ANALYSIS.md for detailed issue explanations. + * See WalletPage.refactored.tsx for the fixed version. + */ + +import React, { useMemo } from 'react'; +import { Box, BoxProps } from '@mui/material'; + +// ❌ ISSUES IN THIS CODE: +// 1. Missing/incorrect TypeScript types +// 2. Logic errors +// 3. Performance issues +// 4. Code quality problems +// See ANALYSIS.md for details + +interface WalletBalance { + currency: string; + amount: number; +} + +interface FormattedWalletBalance { + currency: string; + amount: number; + formatted: string; +} + +interface Props extends BoxProps { + // ❌ Empty interface - BoxProps might not be defined +} + +const WalletPage: React.FC = (props: Props) => { + const { children, ...rest } = props; + // ❌ Issue: children is destructured but never used + + const balances = useWalletBalances(); + const prices = usePrices(); + + // ❌ Issue 1: Parameter type is 'any' - no type safety + const getPriority = (blockchain: any): number => { + switch (blockchain) { + case 'Osmosis': + return 100; + case 'Ethereum': + return 50; + case 'Arbitrum': + return 30; + case 'Zilliqa': + return 20; + case 'Neo': + return 20; + default: + return -99; + } + }; + + // ❌ Issue 2: Multiple logic and performance errors + const sortedBalances = useMemo(() => { + return balances + .filter((balance: WalletBalance) => { + const balancePriority = getPriority(balance.blockchain); + // ❌ Issue 2.1: Variable 'lhsPriority' is not defined! + // ❌ Issue 2.2: Logic is inverted (returns true for amount <= 0) + if (lhsPriority > -99) { + if (balance.amount <= 0) { + return true; // ❌ Filters OUT positive balances! + } + } + return false; + }) + .sort((lhs: WalletBalance, rhs: WalletBalance) => { + const leftPriority = getPriority(lhs.blockchain); + // ❌ Issue 2.3: Tên biến lhs/rhs không rõ ràng + const rightPriority = getPriority(rhs.blockchain); + if (leftPriority > rightPriority) { + return -1; + } else if (rightPriority > leftPriority) { + return 1; + } + // ❌ Issue 2.4: Missing return 0 for equal case + }); + }, [balances, prices]); // ❌ Issue 3: prices in dependency but not used + + // ❌ Issue 4: formattedBalances created but never used + const formattedBalances = sortedBalances.map( + (balance: WalletBalance) => { + return { + ...balance, + // ❌ Issue 5: toFixed() with no parameter = integer only + formatted: balance.amount.toFixed(), + }; + } + ); + + // ❌ Issue 6: Map from sortedBalances (not formattedBalances) + // ❌ Issue 7: Type mismatch - balance doesn't have 'formatted' property + const rows = sortedBalances.map( + (balance: FormattedWalletBalance, index: number) => { + const usdValue = prices[balance.currency] * balance.amount; + return ( + + ); + } + ); + + return
{rows}
; +}; + +export default WalletPage; diff --git a/src/problem3/WalletPage.refactored.tsx b/src/problem3/WalletPage.refactored.tsx new file mode 100644 index 000000000..f14f7784e --- /dev/null +++ b/src/problem3/WalletPage.refactored.tsx @@ -0,0 +1,140 @@ +/** + * Problem 3: Messy React Code - Refactored Version + * All issues from the original code have been fixed. + */ + +import React, { useMemo } from 'react'; + +// ===== TYPES & INTERFACES ===== + +type Blockchain = 'Osmosis' | 'Ethereum' | 'Arbitrum' | 'Zilliqa' | 'Neo'; + +interface WalletBalance { + blockchain: Blockchain; + currency: string; + amount: number; +} + +interface FormattedWalletBalance extends WalletBalance { + formatted: string; + usdValue: number; +} + +interface HTMLDivAttributes { + className?: string; + children?: any; + [key: string]: any; +} + +interface Props extends HTMLDivAttributes {} + +interface PriceMap { + [currency: string]: number; +} + +// ===== CONSTANTS ===== + +const BLOCKCHAIN_PRIORITY: Record = { + 'Osmosis': 100, + 'Ethereum': 50, + 'Arbitrum': 30, + 'Zilliqa': 20, + 'Neo': 20, +}; + +// ===== HELPER FUNCTIONS ===== + +const getPriority = (blockchain: Blockchain): number => { + return BLOCKCHAIN_PRIORITY[blockchain] ?? -99; +}; + +// ===== MOCK HOOKS ===== + +function useWalletBalances(): WalletBalance[] { + return []; +} + +function usePrices(): PriceMap { + return {}; +} + +// ===== MAIN COMPONENT ===== + +function WalletPage(props: Props): React.ReactNode { + const { ...rest } = props; + const balances = useWalletBalances(); + const prices = usePrices(); + + // Filter and sort balances + const getSortedBalances = (balances: WalletBalance[]): WalletBalance[] => { + return balances + .filter((balance: WalletBalance) => { + const priority = getPriority(balance.blockchain); + return priority > -99 && balance.amount > 0; + }) + .sort((a: WalletBalance, b: WalletBalance) => { + const aPriority = getPriority(a.blockchain); + const bPriority = getPriority(b.blockchain); + return bPriority - aPriority; + }); + }; + + const sortedBalances = useMemo(() => getSortedBalances(balances), [balances]); + + // Format balances and calculate USD values + const getFormattedBalances = ( + sortedBalances: WalletBalance[], + prices: PriceMap + ): FormattedWalletBalance[] => { + return sortedBalances.map((balance: WalletBalance): FormattedWalletBalance => { + const usdValue = (prices[balance.currency] ?? 0) * balance.amount; + return { + ...balance, + formatted: balance.amount.toFixed(2), + usdValue, + }; + }); + }; + + const formattedBalances = useMemo( + () => getFormattedBalances(sortedBalances, prices), + [sortedBalances, prices] + ); + + const rows = formattedBalances.map((balance: FormattedWalletBalance) => ( + + )); + + return
{rows}
; +} + +// ===== WALLETROW COMPONENT ===== + +interface WalletRowProps { + amount: number; + usdValue: number; + formattedAmount: string; + className?: string; +} + +const WalletRow: React.FC = ({ + usdValue, + formattedAmount, + className, +}) => { + return ( +
+ {formattedAmount} - ${usdValue.toFixed(2)} +
+ ); +}; + +// ===== EXPORTS ===== + +export default WalletPage; +export type { WalletBalance, FormattedWalletBalance, Props }; diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 000000000..a7fc6fbf2 --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,25 @@ +{ + "compilerOptions": { + "target": "ES2020", + "useDefineForClassFields": true, + "lib": ["ES2020", "DOM", "DOM.Iterable"], + "module": "ESNext", + "skipLibCheck": true, + + /* Bundler mode */ + "moduleResolution": "bundler", + "allowImportingTsExtensions": true, + "resolveJsonModule": true, + "isolatedModules": true, + "noEmit": true, + "jsx": "react-jsx", + + /* Linting */ + "strict": true, + "noUnusedLocals": true, + "noUnusedParameters": true, + "noFallthroughCasesInSwitch": true + }, + "include": ["src"], + "references": [{ "path": "./tsconfig.node.json" }] +} diff --git a/tsconfig.node.json b/tsconfig.node.json new file mode 100644 index 000000000..42872c59f --- /dev/null +++ b/tsconfig.node.json @@ -0,0 +1,10 @@ +{ + "compilerOptions": { + "composite": true, + "skipLibCheck": true, + "module": "ESNext", + "moduleResolution": "bundler", + "allowSyntheticDefaultImports": true + }, + "include": ["vite.config.ts"] +} diff --git a/vite.config.ts b/vite.config.ts new file mode 100644 index 000000000..a2200fc0b --- /dev/null +++ b/vite.config.ts @@ -0,0 +1,10 @@ +import { defineConfig } from 'vite' +import react from '@vitejs/plugin-react' + +export default defineConfig({ + plugins: [react()], + server: { + port: 3000, + open: true, + }, +})