+
+
+ );
+};
diff --git a/src/problem2/src/components/SwapCard.tsx b/src/problem2/src/components/SwapCard.tsx
new file mode 100644
index 0000000000..6fac1ed37a
--- /dev/null
+++ b/src/problem2/src/components/SwapCard.tsx
@@ -0,0 +1,301 @@
+import { useState, useEffect, useCallback } from 'react';
+import type { Token, SwapFormErrors } from '../types';
+import { TokenSelector } from './TokenSelector';
+import { AmountInput } from './AmountInput';
+
+interface Toast {
+ id: number;
+ type: 'success' | 'error' | 'info';
+ title: string;
+ message: string;
+}
+
+interface SwapCardProps {
+ tokens: Token[];
+ balances: Record
+
+
+
+ Instant exchange
+
+ Swap tokens
+
+
+
+
+
+
+
+
+
+ You pay
+ {fromToken ? (
+ Balance {balances[fromToken.symbol]?.toLocaleString(undefined, { maximumFractionDigits: 4 })} {fromToken.symbol}
+ ) : (
+ Select token
+ )}
+
+
+
+ {fromAmount && fromValueUSD > 0 && (
+
+
+
+
+ ~${fromValueUSD.toLocaleString(undefined, { minimumFractionDigits: 2, maximumFractionDigits: 2 })}
+ )}
+
+
+
+ {isSwapping && (
+
+ You receive
+ {toToken ? (
+ Balance {balances[toToken.symbol]?.toLocaleString(undefined, { maximumFractionDigits: 4 })} {toToken.symbol}
+ ) : (
+ Select token
+ )}
+
+
+
+
+ undefined}
+ placeholder="0.0"
+ readOnly
+ error={errors.toToken}
+ />
+
+
+
+
+
+ )}
+
+
+
+ Processing transaction…
+
+ {exchangeRate ? (
+ <>
+
+
+
+
+ Rate{exchangeRate}
+ Price impact 0.5 ? 'is-warn' : ''}>{priceImpact < 0.01 ? '<0.01' : priceImpact.toFixed(2)}%
+ Network fee~$0.50
+ Min received{minReceived} {toToken?.symbol ?? ''}
+
+ ) : (
+ Choose tokens to preview rate and slippage
+ )}
+
+ {toasts.map(toast => (
+
+
+
+ ))}
+
+ {toast.type === 'success' && (
+
+ )}
+ {toast.type === 'error' && (
+
+ )}
+ {toast.type === 'info' && (
+
+ )}
+
+
+
+
+ {toast.title}
+{toast.message}
+{token.symbol.slice(0, 2)}
;
+ }
+
+ return (
+
+
+
+ {isOpen && (
+
+ );
+};
diff --git a/src/problem2/src/hooks/useTheme.tsx b/src/problem2/src/hooks/useTheme.tsx
new file mode 100644
index 0000000000..dd05cb374f
--- /dev/null
+++ b/src/problem2/src/hooks/useTheme.tsx
@@ -0,0 +1,40 @@
+import { createContext, useContext, useState, useEffect, type ReactNode } from 'react';
+
+type Theme = 'dark' | 'light';
+
+interface ThemeContextType {
+ theme: Theme;
+ toggleTheme: () => void;
+}
+
+const ThemeContext = createContext
+
+ )}
+
+
+ setSearch(event.target.value)}
+ placeholder="Search token"
+ type="text"
+ />
+
+
+
+ {filteredTokens.length === 0 ? (
+
+ No tokens found
+ ) : (
+ filteredTokens.map((token) => (
+
+ ))
+ )}
+
+ {rows}
+
+ );
+};
+
+export default WalletPage;
\ No newline at end of file
diff --git a/src/problem3/solution.tsx b/src/problem3/solution.tsx
new file mode 100644
index 0000000000..dc7cb1f057
--- /dev/null
+++ b/src/problem3/solution.tsx
@@ -0,0 +1,227 @@
+/**
+ * Problem 3: Messy React - Solution & Analysis
+ *
+ * This file contains:
+ * 1. The original messy code with 9 identified issues
+ * 2. The refactored optimized version
+ * 3. Detailed documentation in ANALYSIS.md
+ *
+ * TOTAL ISSUES FOUND: 9 bugs/anti-patterns
+ * - 2 CRITICAL (causes runtime crash)
+ * - 4 HIGH (performance/type issues)
+ * - 3 MEDIUM (code quality)
+ */
+
+import React, { useMemo } from 'react';
+
+// ============================================================================
+// INTERFACES
+// ============================================================================
+
+interface WalletBalance {
+ blockchain: string;
+ currency: string;
+ amount: number;
+}
+
+interface FormattedWalletBalance extends WalletBalance {
+ formatted: string;
+}
+
+interface Props extends React.HTMLAttributes{rows}
;
+};
+*/
+
+// ============================================================================
+// REFACTORED SOLUTION
+// ============================================================================
+
+/**
+ * Priority mapping for different blockchains
+ * Moved OUTSIDE the component to prevent recreation on every render
+ */
+const getPriority = (blockchain: string): number => {
+ switch (blockchain) {
+ case 'Osmosis':
+ return 100;
+ case 'Ethereum':
+ return 50;
+ case 'Arbitrum':
+ return 30;
+ case 'Zilliqa':
+ case 'Neo':
+ return 20;
+ default:
+ return -99;
+ }
+};
+
+/**
+ * WalletPage Component - Refactored Version
+ *
+ * All issues from the original code have been fixed:
+ * - Fixed undefined variable reference
+ * - Corrected filter logic (show positive balances)
+ * - Removed unused dependencies from useMemo
+ * - Moved getPriority outside component
+ * - Using unique keys instead of array indices
+ * - Proper TypeScript typing
+ */
+const WalletPage: React.FC{rows}
;
+};
+
+// ============================================================================
+// PLACEHOLDER COMPONENT (for compilation)
+// ============================================================================
+
+interface WalletRowProps {
+ className: string;
+ key: string;
+ amount: number;
+ usdValue: number;
+ formattedAmount: string;
+}
+
+const WalletRow: React.FC
+ {formattedAmount}
+ ${usdValue.toFixed(2)}
+
+);
+
+export { WalletPage, WalletBalance, FormattedWalletBalance };