Vue Composition API vs Juris enhance(): The Ultimate Computational Layout Challenge

<template> <div class="trading-dashboard"> <!-- Price Chart --> <div class="chart-container"> <canvas ref="priceChart" :width="chartWidth" :height="chartHeight"></canvas> <div v-if="isLoading" class="loading">Loading price data...</div> </div> <!-- Moving Averages --> <div class="indicators"> <div v-for="period in movingAveragePeriods" :key="period" class="indicator"> <span>MA{{ period }}:</span> <span :class="getMAClass(period)"> {{ formatPrice(movingAverages[period]) }} </span> </div> </div> <!-- Portfolio Metrics --> <div class="metrics-grid"> <div class="metric-card" v-for="metric in portfolioMetrics" :key="metric.id"> <h3>{{ metric.label }}</h3> <div class="metric-value" :class="metric.changeClass"> {{ metric.formattedValue }} </div> <div class="metric-change">{{ metric.changeText }}</div> </div> </div> <!-- Order Book --> <div class="order-book"> <div class="book-side"> <h4>Bids</h4> <div v-for="order in topBids" :key="order.price" class="order-row bid"> <span class="price">{{ formatPrice(order.price) }}</span> <span class="size">{{ order.size }}</span> </div> </div> <div class="book-side"> <h4>Asks</h4> <div v-for="order in topAsks" :key="order.price" class="order-row ask"> <span class="price">{{ formatPrice(order.price) }}</span> <span class="size">{{ order.size }}</span> </div> </div> </div> </div> </template> <script> import { ref, computed, watch, onMounted, onUnmounted, nextTick } from 'vue'; export default { setup() { // Reactive state const priceData = ref([]); const orderBook = ref({ bids: [], asks: [] }); const portfolio = ref({}); const isLoading = ref(true); const lastUpdate = ref(Date.now()); // Chart configuration const chartWidth = ref(800); const chartHeight = ref(400); const priceChart = ref(null); // Constants const movingAveragePeriods = [20, 50, 200]; const maxDataPoints = 1000; const updateInterval = 100; // ms // Computed properties for heavy calculations const movingAverages = computed(() => { const averages = {}; movingAveragePeriods.forEach(period => { if (priceData.value.length >= period) { const recentPrices = priceData.value.slice(-period); const sum = recentPrices.reduce((acc, point) => acc + point.price, 0); averages[period] = sum / period; } else { averages[period] = 0; } }); return averages; }); const portfolioMetrics = computed(() => { if (!portfolio.value.holdings) return []; // Complex portfolio calculations const totalValue = Object.entries(portfolio.value.holdings).reduce((total, [symbol, holding]) => { const currentPrice = getCurrentPrice(symbol); return total + (holding.quantity * currentPrice); }, 0); const todayChange = calculateDayChange(portfolio.value.holdings); const totalReturn = calculateTotalReturn(portfolio.value.holdings); return [ { id: 'total-value', label: 'Total Value', formattedValue: formatCurrency(totalValue), changeClass: todayChange >= 0 ? 'positive' : 'negative', changeText: `${todayChange >= 0 ? '+' : ''}${formatPercent(todayChange)}` }, { id: 'total-return', label: 'Total Return', formattedValue: formatPercent(totalReturn), changeClass: totalReturn >= 0 ? 'positive' : 'negative', changeText: formatCurrency(totalValue * totalReturn / 100) } ]; }); const topBids = computed(() => { return orderBook.value.bids .sort((a, b) => b.price - a.price) .slice(0, 10); }); const topAsks = computed(() => { return orderBook.value.asks .sort((a, b) => a.price - b.price) .slice(0, 10); }); // Watchers for side effects watch(priceData, async (newData) => { if (newData.length > 0) { await nextTick(); updatePriceChart(); } }, { deep: true }); watch(movingAverages, (newAverages) => { // Update chart overlays updateChartIndicators(newAverages); }, { deep: true }); // Methods const updatePriceChart = () => { if (!priceChart.value) return; const ctx = priceChart.value.getContext('2d'); const width = chartWidth.value; const height = chartHeight.value; // Clear canvas ctx.clearRect(0, 0, width, height); if (priceData.value.length < 2) return; // Calculate scales const prices = priceData.value.map(d => d.price); const minPrice = Math.min(...prices); const maxPrice = Math.max(...prices); const priceRange = maxPrice - minPrice; // Draw price line ctx.beginPath(); ctx.strokeStyle = '#3b82f6'; ctx.lineWidth = 2; priceData.value.forEach((point, index) => { const x = (index / (priceData.value.length - 1)) * width; const y = height - ((point.price - minPrice) / priceRange) * height; if (index === 0) { ctx.moveTo(x, y); } else { ctx.lineTo(x, y); } }); ctx.stroke(); }; const updateChartIndicators = (averages) => { if (!priceChart.value) return; const ctx = priceChart.value.getContext('2d'); // Draw moving average lines // ... complex chart drawing logic }; const fetchInitialData = async () => { try { isLoading.value = true; // Simulate heavy data loading const [priceResponse, portfolioResponse] = await Promise.all([ fetch('/api/price-history'), fetch('/api/portfolio') ]); priceData.value = await priceResponse.json(); portfolio.value = await portfolioResponse.json(); } catch (error) { console.error('Failed to load initial data:', error); } finally { isLoading.value = false; } }; const startRealTimeUpdates = () => { const ws = new WebSocket('wss://api.trading.com/live'); ws.onmessage = (event) => { const data = JSON.parse(event.data); if (data.type === 'price') { // Add new price point priceData.value.push({ timestamp: data.timestamp, price: data.price }); // Maintain max data points if (priceData.value.length > maxDataPoints) { priceData.value.shift(); } } else if (data.type === 'orderbook') { orderBook.value = data.orderbook; } lastUpdate.value = Date.now(); }; return ws; }; // Utility functions const getCurrentPrice = (symbol) => { // Complex price lookup logic return priceData.value[priceData.value.length - 1]?.price || 0; }; const calculateDayChange = (holdings) => { // Complex day change calculation return Math.random() * 10 - 5; // Mock calculation }; const calculateTotalReturn = (holdings) => { // Complex total return calculation return Math.random() * 100 - 50; // Mock calculation }; const formatPrice = (price) => `$${price.toFixed(2)}`; const formatCurrency = (amount) => `$${amount.toLocaleString()}`; const formatPercent = (percent) => `${percent.toFixed(2)}%`; const getMAClass = (period) => { const current = getCurrentPrice(); const ma = movingAverages.value[period]; return current > ma ? 'bullish' : 'bearish'; }; // Lifecycle let websocket = null; onMounted(async () => { await fetchInitialData(); websocket = startRealTimeUpdates(); }); onUnmounted(() => { if (websocket) { websocket.close(); } }); return { // State priceData, orderBook, portfolio, isLoading, // Chart refs priceChart, chartWidth, chartHeight, // Computed movingAverages, portfolioMetrics, topBids, topAsks, // Constants movingAveragePeriods, // Methods formatPrice, getMAClass }; } }; </script> <style scoped> .trading-dashboard { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: 1fr 1fr; gap: 20px; height: 100vh; padding: 20px; } .chart-container { position: relative; background: white; border-radius: 8px; padding: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); } .loading { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); color: #666; } .indicators { display: flex; gap: 20px; align-items: center; background: white; padding: 15px; border-radius: 8px; } .indicator { display: flex; flex-direction: column; align-items: center; } .bullish { color: #10b981; } .bearish { color: #ef4444; } .metrics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; } .metric-card { background: white; padding: 20px; border-radius: 8px; text-align: center; } .metric-value { font-size: 1.5rem; font-weight: bold; margin: 10px 0; } .positive { color: #10b981; } .negative { color: #ef4444; } .order-book { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; background: white; padding: 20px; border-radius: 8px; } .order-row { display: flex; justify-content: space-between; padding: 5px; font-family: monospace; } .bid { background: rgba(16, 185, 129, 0.1); } .ask { background: rgba(239, 68, 68, 0.1); } </style> 

<!-- HTML Structure --> <div class="trading-dashboard"> <!-- Price Chart --> <div class="chart-container"> <canvas class="price-chart" width="800" height="400"></canvas> <div class="loading">Loading price data...</div> </div> <!-- Moving Averages --> <div class="indicators"></div> <!-- Portfolio Metrics --> <div class="metrics-grid"></div> <!-- Order Book --> <div class="order-book"> <div class="book-side bids"> <h4>Bids</h4> <div class="orders"></div> </div> <div class="book-side asks"> <h4>Asks</h4> <div class="orders"></div> </div> </div> </div> 

// Juris enhance() implementation const juris = new Juris({ states: { priceData: [], orderBook: { bids: [], asks: [] }, portfolio: {}, isLoading: true, lastUpdate: Date.now() }, services: { chartService: { updatePriceChart(canvas, data) { if (!canvas || data.length < 2) return; const ctx = canvas.getContext('2d'); const { width, height } = canvas; // Clear and redraw - optimized rendering ctx.clearRect(0, 0, width, height); const prices = data.map(d => d.price); const minPrice = Math.min(...prices); const maxPrice = Math.max(...prices); const priceRange = maxPrice - minPrice; ctx.beginPath(); ctx.strokeStyle = '#3b82f6'; ctx.lineWidth = 2; data.forEach((point, index) => { const x = (index / (data.length - 1)) * width; const y = height - ((point.price - minPrice) / priceRange) * height; if (index === 0) ctx.moveTo(x, y); else ctx.lineTo(x, y); }); ctx.stroke(); }, calculateMovingAverages(data, periods = [20, 50, 200]) { const averages = {}; periods.forEach(period => { if (data.length >= period) { const recentPrices = data.slice(-period); const sum = recentPrices.reduce((acc, point) => acc + point.price, 0); averages[period] = sum / period; } else { averages[period] = 0; } }); return averages; } }, portfolioService: { calculateMetrics(portfolio, priceData) { if (!portfolio.holdings || priceData.length === 0) return []; const currentPrice = priceData[priceData.length - 1]?.price || 0; // Complex calculations performed efficiently const totalValue = Object.entries(portfolio.holdings).reduce((total, [symbol, holding]) => { return total + (holding.quantity * currentPrice); }, 0); const todayChange = this.calculateDayChange(portfolio.holdings); const totalReturn = this.calculateTotalReturn(portfolio.holdings); return [ { id: 'total-value', label: 'Total Value', formattedValue: this.formatCurrency(totalValue), changeClass: todayChange >= 0 ? 'positive' : 'negative', changeText: `${todayChange >= 0 ? '+' : ''}${this.formatPercent(todayChange)}` }, { id: 'total-return', label: 'Total Return', formattedValue: this.formatPercent(totalReturn), changeClass: totalReturn >= 0 ? 'positive' : 'negative', changeText: this.formatCurrency(totalValue * totalReturn / 100) } ]; }, calculateDayChange: (holdings) => Math.random() * 10 - 5, calculateTotalReturn: (holdings) => Math.random() * 100 - 50, formatCurrency: (amount) => `$${amount.toLocaleString()}`, formatPercent: (percent) => `${percent.toFixed(2)}%`, formatPrice: (price) => `$${price.toFixed(2)}` }, dataService: { async fetchInitialData() { try { juris.setState('isLoading', true); const [priceResponse, portfolioResponse] = await Promise.all([ fetch('/api/price-history'), fetch('/api/portfolio') ]); const priceData = await priceResponse.json(); const portfolio = await portfolioResponse.json(); juris.setState('priceData', priceData); juris.setState('portfolio', portfolio); } catch (error) { console.error('Failed to load initial data:', error); } finally { juris.setState('isLoading', false); } }, startRealTimeUpdates() { const ws = new WebSocket('wss://api.trading.com/live'); ws.onmessage = (event) => { const data = JSON.parse(event.data); if (data.type === 'price') { const currentData = juris.getState('priceData', []); const newData = [...currentData, { timestamp: data.timestamp, price: data.price }]; // Maintain max data points if (newData.length > 1000) { newData.shift(); } juris.setState('priceData', newData); } else if (data.type === 'orderbook') { juris.setState('orderBook', data.orderbook); } juris.setState('lastUpdate', Date.now()); }; return ws; } } } }); // Enhance price chart with automatic updates juris.enhance('.chart-container', ({ chartService, getState }) => ({ selectors: { '.price-chart': () => { const canvas = document.querySelector('.price-chart'); const priceData = getState('priceData', []); // Non-blocking chart updates if (priceData.length > 0) { requestAnimationFrame(() => { chartService.updatePriceChart(canvas, priceData); }); } return {}; }, '.loading': () => ({ style: () => ({ display: getState('isLoading') ? 'block' : 'none' }) }) } })); // Enhance moving averages indicators juris.enhance('.indicators', ({ chartService, portfolioService, getState }) => ({ children: () => { const priceData = getState('priceData', []); const averages = chartService.calculateMovingAverages(priceData); const currentPrice = priceData[priceData.length - 1]?.price || 0; return Object.entries(averages).map(([period, avg]) => ({ div: { className: 'indicator', children: [ { span: { text: `MA${period}:` } }, { span: { text: portfolioService.formatPrice(avg), className: currentPrice > avg ? 'bullish' : 'bearish' }} ] } })); } })); // Enhance portfolio metrics juris.enhance('.metrics-grid', ({ portfolioService, getState }) => ({ children: () => { const portfolio = getState('portfolio', {}); const priceData = getState('priceData', []); const metrics = portfolioService.calculateMetrics(portfolio, priceData); return metrics.map(metric => ({ div: { className: 'metric-card', children: [ { h3: { text: metric.label } }, { div: { className: `metric-value ${metric.changeClass}`, text: metric.formattedValue }}, { div: { className: 'metric-change', text: metric.changeText }} ] } })); } })); // Enhance order book juris.enhance('.order-book', ({ portfolioService, getState }) => ({ selectors: { '.bids .orders': () => ({ children: () => { const orderBook = getState('orderBook', { bids: [] }); const topBids = orderBook.bids .sort((a, b) => b.price - a.price) .slice(0, 10); return topBids.map(order => ({ div: { className: 'order-row bid', children: [ { span: { className: 'price', text: portfolioService.formatPrice(order.price) }}, { span: { className: 'size', text: order.size.toString() }} ] } })); } }), '.asks .orders': () => ({ children: () => { const orderBook = getState('orderBook', { asks: [] }); const topAsks = orderBook.asks .sort((a, b) => a.price - b.price) .slice(0, 10); return topAsks.map(order => ({ div: { className: 'order-row ask', children: [ { span: { className: 'price', text: portfolioService.formatPrice(order.price) }}, { span: { className: 'size', text: order.size.toString() }} ] } })); } }) } })); // Initialize the dashboard juris.services.dataService.fetchInitialData(); const websocket = juris.services.dataService.startRealTimeUpdates(); // Cleanup on page unload window.addEventListener('beforeunload', () => { if (websocket) websocket.close(); }); 

// Heavy computations block UI const portfolioMetrics = computed(() => { // Complex calculations run on every reactive change // Can cause frame drops during rapid updates return heavyCalculation(); // 50ms+ computation }); // Manual optimization required watch(priceData, async (newData) => { // Must use nextTick to prevent blocking await nextTick(); updateChart(); // Still can block if not optimized }); 

// Non-blocking by default children: () => { const metrics = portfolioService.calculateMetrics(); // Automatic optimization return metrics.map(/* render */); // Never blocks UI } // Chart updates use requestAnimationFrame automatically if (priceData.length > 0) { requestAnimationFrame(() => { chartService.updatePriceChart(canvas, priceData); // Smooth 60fps }); } 

// Developer must understand: // 1. ref() vs reactive() vs computed() // 2. Watch effects and timing // 3. Template reactivity system // 4. Lifecycle management // 5. Performance optimization techniques // 6. Dependency injection patterns const complexSetup = () => { const state = ref(initialState); const computed = computed(() => heavyCalculation()); const watcher = watch(state, callback, { deep: true }); onMounted(async () => { await fetchData(); startWebSocket(); }); onUnmounted(() => { cleanup(); // Manual cleanup required }); return { state, computed }; // Manual exposure }; 

// Developer just needs to understand: // 1. JavaScript objects // 2. Functions // 3. Basic async/await juris.enhance('.dashboard', ({ portfolioService, getState }) => ({ children: () => { const data = getState('portfolio'); return portfolioService.calculateMetrics(data).map(/* render */); } })); // That's it! No lifecycle, no cleanup, no performance concerns 

// Complex debugging scenarios console.log('Reactive state:', toRaw(complexState)); console.log('Computed dependencies:', /* hard to track */); console.log('Watch triggers:', /* timing issues */); 

// Simple debugging console.log('State:', juris.getState('portfolio')); console.log('Computed result:', portfolioService.calculateMetrics()); // Clear, predictable data flow 

Template ↔ Composition Setup ↔ Reactive System ↓ ↓ ↓ DOM API Complex State Proxy-based Management Reactivity ↓ ↓ ↓ Manual Performance Memory Binding Optimization Management 

HTML ↔ enhance() ↔ State + Services ↓ ↓ ↓ Direct Simple Automatic DOM Objects Reactivity ↓ ↓ ↓ Auto No Build Optimal Bind Required Performance