[FE] - TO HOANG MINH QUAN (tohoangminhquan.dp@gmail.com)

src/problem1/REQUIREMENT.MD

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+Provide 3 unique implementations of the following function in JavaScript.
+
+**Input**: `n` - any integer
+
+_Assuming this input will always produce a result lesser than `Number.MAX_SAFE_INTEGER`_.
+
+**Output**: `return` - summation to `n`, i.e. `sum_to_n(5) === 1 + 2 + 3 + 4 + 5 === 15`.
+
+```jsx
+var sum_to_n_a = function (n) {
+  // your code here
+};
+
+var sum_to_n_b = function (n) {
+  // your code here
+};
+
+var sum_to_n_c = function (n) {
+  // your code here
+};
+```

src/problem1/SCRIPT.MD

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+# Run TypeScript Solution
+
+## Compile TypeScript to JavaScript
+
+Run the following command:
+
+```bash
+npx tsc solution.ts
+```
+
+This will generate:
+
+```bash
+solution.js
+```
+
+---
+
+## Run the JavaScript file
+
+```bash
+node solution.js
+```
+
+---
+
+## Example Output
+
+```bash
+Iterative:
+sum_to_n(1) = 1
+sum_to_n(5) = 15
+sum_to_n(10) = 55
+sum_to_n(100) = 5050
+
+Functional:
+sum_to_n(1) = 1
+sum_to_n(5) = 15
+sum_to_n(10) = 55
+sum_to_n(100) = 5050
+
+Recursive:
+sum_to_n(1) = 1
+sum_to_n(5) = 15
+sum_to_n(10) = 55
+sum_to_n(100) = 5050
+```

src/problem1/solution.ts

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+// Iterative
+var sum_to_n_a = function (n: number) : number {
+  let sum = 0;
+
+  for (let i = 1; i <= n; i++) {
+    sum += i;
+  }
+
+  return sum;
+};
+
+// Functional (reduce)
+var sum_to_n_b = function (n : number) : number {
+  return Array.from({ length: n }, (_, i) => i + 1).reduce(
+    (a, b) => a + b,
+    0
+  );
+};
+
+// Recursive
+var sum_to_n_c = function (n: number) : number {
+  if(n === 1) return 1
+
+  return n + sum_to_n_c(n - 1);
+};
+
+// Test cases
+function runTests() {
+  const testCases = [1, 5, 10, 100];
+
+  const functions = [
+    { name: "Iterative", fn: sum_to_n_a },
+    { name: "Functional", fn: sum_to_n_b },
+    { name: "Recursive", fn: sum_to_n_c },
+  ];
+
+  functions.forEach(({ name, fn }) => {
+    console.log(`\n${name}:`);
+
+    testCases.forEach((n) => {
+      console.log(`sum_to_n(${n}) = ${fn(n)}`);
+    });
+  });
+}
+
+runTests();

src/problem2/fancy-form/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+yarn.lock
+package-lock.json
+.pnp.*
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

src/problem2/fancy-form/README.md

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+# Currency Swap UI
+
+A modern currency swap interface built with React, TypeScript, and Vite.
+
+The application allows users to:
+
+- View available token balances
+- Swap between different currencies
+- Simulate swap transactions
+- Experience smooth animations and responsive UI interactions
+
+## Tech Stack
+
+- React
+- TypeScript
+- Vite
+- TailwindCSS
+- Framer Motion
+- Lucide React
+
+## Features
+
+- Token balance management
+- Swap direction toggle
+- Animated UI interactions
+- Responsive design
+- Mock transaction confirmation flow
+- Dynamic token icons
+- Loading states and validations
+
+## API
+
+Token prices are fetched from:
+
+```txt
+https://interview.switcheo.com/prices.json
+```
+
+Token icons are loaded from:
+
+```txt
+https://github.com/Switcheo/token-icons
+```
+
+---
+
+# Getting Started
+
+## Install dependencies
+
+### Using npm
+
+```bash
+npm install
+```
+
+### Using yarn
+
+```bash
+yarn
+```
+
+---
+
+# Run Development Server
+
+### Using npm
+
+```bash
+npm run dev
+```
+
+### Using yarn
+
+```bash
+yarn dev
+```
+
+---
+
+# Build Project
+
+### Using npm
+
+```bash
+npm run build
+```
+
+### Using yarn
+
+```bash
+yarn build
+```
+
+---
+
+# Preview Production Build
+
+### Using npm
+
+```bash
+npm run preview
+```
+
+### Using yarn
+
+```bash
+yarn preview
+```

src/problem2/fancy-form/eslint.config.js

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+import js from '@eslint/js'
+import globals from 'globals'
+import reactHooks from 'eslint-plugin-react-hooks'
+import reactRefresh from 'eslint-plugin-react-refresh'
+import tseslint from 'typescript-eslint'
+import { defineConfig, globalIgnores } from 'eslint/config'
+
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      js.configs.recommended,
+      tseslint.configs.recommended,
+      reactRefresh.configs.vite,
+    ],
+    languageOptions: {
+      globals: globals.browser,
+    },
+  },
+])

src/problem2/fancy-form/index.html

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+<!doctype html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8" />
+  <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <title>swap-app</title>
+</head>
+
+<body>
+  <div id="root"></div>
+  <script type="module" src="/src/main.tsx"></script>
+</body>
+
+</html>

src/problem2/fancy-form/package.json

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+{
+  "name": "fancy-form",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "lint": "eslint .",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@radix-ui/react-dialog": "^1.1.15",
+    "@radix-ui/react-dropdown-menu": "^2.1.16",
+    "@radix-ui/react-select": "^2.2.6",
+    "@radix-ui/react-slot": "^1.2.4",
+    "@radix-ui/react-tooltip": "^1.2.8",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "framer-motion": "^12.38.0",
+    "lucide-react": "^1.14.0",
+    "react": "^19.2.6",
+    "react-dom": "^19.2.6",
+    "tailwind-merge": "^3.6.0"
+  },
+  "devDependencies": {
+    "@eslint/js": "^10.0.1",
+    "@types/node": "^24.12.3",
+    "@types/react": "^19.2.14",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^6.0.1",
+    "autoprefixer": "^10.5.0",
+    "eslint": "^10.3.0",
+    "eslint-plugin-react-hooks": "^7.1.1",
+    "eslint-plugin-react-refresh": "^0.5.2",
+    "globals": "^17.6.0",
+    "postcss": "^8.5.14",
+    "tailwindcss": "^3.4.19",
+    "typescript": "~6.0.2",
+    "typescript-eslint": "^8.59.2",
+    "vite": "^8.0.12"
+  }
+}

src/problem2/fancy-form/postcss.config.js

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+export default {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}