Pavel T

finance-tracker/.prettierrc

@@ -0,0 +1,7 @@
+{
+  "semi": true,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "es5",
+  "printWidth": 80
+}

finance-tracker/app.js

@@ -1,3 +1,15 @@
-// This is the entrypoint for your application.
-// node app.js
+import { transactions } from './data.js';
+import { addTransaction, printSummary } from './finance.js';
 
+const initFn = (transactions) => {
+  addTransaction(transactions, {
+    id: 6,
+    type: 'income',
+    category: 'salary',
+    amount: 3000,
+    description: 'Monthly salary',
+    date: '2025-02-15',
+  });
+  return printSummary(transactions);
+};
+console.log(initFn(transactions));

finance-tracker/data.js

@@ -1,2 +1,42 @@
-// Place here the transaction data array. Use it in your application as needed.
-const transactions = [];
+export const transactions = [
+  {
+    id: 1,
+    type: 'income',
+    category: 'salary',
+    amount: 3000,
+    description: 'Monthly salary',
+    date: '2025-01-15',
+  },
+  {
+    id: 2,
+    type: 'expense',
+    category: 'housing',
+    amount: 1200,
+    description: 'Rent',
+    date: '2025-01-15',
+  },
+  {
+    id: 3,
+    type: 'expense',
+    category: 'food',
+    amount: 300,
+    description: 'Groceries',
+    date: '2025-01-15',
+  },
+  {
+    id: 4,
+    type: 'income',
+    category: 'side-income',
+    amount: 500,
+    description: 'Freelance',
+    date: '2025-01-15',
+  },
+  {
+    id: 5,
+    type: 'expense',
+    category: 'bills',
+    amount: 150,
+    description: 'Utilities',
+    date: '2025-01-15',
+  },
+];

finance-tracker/finance.js

@@ -1,27 +1,120 @@
-function addTransaction(transaction) {
-  // TODO: Implement this function
+import chalk from 'chalk';
+
+// Return a new array to avoid mutating the original transactions list
+function addTransaction(transactions, transaction) {
+  return [...transactions, transaction];
+}
+
+function getTotalIncome(transactions) {
+  let total = 0;
+  for (const transaction of transactions) {
+    const { type, amount } = transaction;
+    if (type === 'income') {
+      total += amount;
+    }
+  }
+  return total;
+}
+
+function getTotalExpenses(transactions) {
+  let total = 0;
+  for (const transaction of transactions) {
+    const { type, amount } = transaction;
+    if (type === 'expense') {
+      total += amount;
+    }
+  }
+  return total;
+}
+
+function getBalance(transactions) {
+  const totalIncome = getTotalIncome(transactions);
+  const totalExpenses = getTotalExpenses(transactions);
+  return totalIncome - totalExpenses;
 }
 
-function getTotalIncome() {
-  // TODO: Implement this function
+function getTransactionsByCategory(transactions, category) {
+  const result = [];
+  for (const transaction of transactions) {
+    if (transaction.category === category) {
+      result.push(transaction);
+    }
+  }
+  return result;
 }
 
-function getTotalExpenses() {
-  // TODO: Implement this function
+function getLargestExpense(transactions) {
+  let largestExpense = 0;
+  for (const transaction of transactions) {
+    const { type, amount } = transaction;
+    if (type === 'expense' && amount > largestExpense) {
+      largestExpense = amount;
+    }
+  }
+  return largestExpense;
 }
 
-function getBalance() {
-  // TODO: Implement this function
+// Uses getLargestExpense, so the array is iterated more than once
+function getLargestExpenseDescription(transactions) {
+  let largestExpenseDescription = '';
+  for (const transaction of transactions) {
+    const { type, amount, description } = transaction;
+    if (type === 'expense' && amount === getLargestExpense(transactions)) {
+      largestExpenseDescription = description;
+    }
+  }
+  return largestExpenseDescription;
 }
 
-function getTransactionsByCategory(category) {
-  // TODO: Implement this function
+function printAllTransactions(transactions) {
+  let result = '';
+  for (const transaction of transactions) {
+    const { id, type, category, amount, description } = transaction;
+    const coloredCategory = chalk.yellow(category);
+    const coloredAmount =
+      type === 'income' ? chalk.green(amount) : chalk.red(amount);
+    result += `${id}. [${type.toUpperCase()}] ${coloredCategory[0].toUpperCase() + coloredCategory.slice(1)} - €${coloredAmount} (${description.toLowerCase()})
+`;
+  }
+  return result;
 }
 
-function getLargestExpense() {
-  // TODO: Implement this function
+// Calculations are delegated to helper functions; this function handles formatting only
+function printSummary(transactions) {
+  const totalIncome = chalk.bold.green(getTotalIncome(transactions));
+  const totalExpenses = chalk.bold.red(getTotalExpenses(transactions));
+  const balance =
+    getBalance(transactions) >= 0
+      ? chalk.bold.cyan(getBalance(transactions))
+      : chalk.bold.red(getBalance(transactions));
+  const largestExpense = chalk.red(getLargestExpense(transactions));
+  const largestExpenseDescription = getLargestExpenseDescription(transactions);
+  const AllTransactions = printAllTransactions(transactions);
+  const transactionCount = transactions.length;
+  return `
+💰 PERSONAL FINANCE TRACKER 💰
+
+All Transactions:
+${AllTransactions}
+
+📊 FINANCIAL SUMMARY 📊
+Total Income: €${totalIncome}
+Total Expenses: €${totalExpenses}
+Current Balance: €${balance}
+
+Largest Expense: ${largestExpenseDescription} (${largestExpense})
+Total Transactions: ${transactionCount}
+`;
 }
 
-function printAllTransactions() {
-  // TODO: Implement this function
-}
+export {
+  addTransaction,
+  getTotalIncome,
+  getTotalExpenses,
+  getBalance,
+  getTransactionsByCategory,
+  getLargestExpense,
+  getLargestExpenseDescription,
+  printAllTransactions,
+  printSummary,
+};

finance-tracker/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "finance-tracker",
+  "version": "1.0.0",
+  "description": "The week 4 assignment for the HackYourFuture Core program can be found at the following link: https://hub.hackyourfuture.nl/core-program-week-4-assignment",
+  "main": "app.js",
+  "scripts": {
+    "start": "node app.js",
+    "format": "prettier --write ."
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/pavel-tisner/c55-core-week-4.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/pavel-tisner/c55-core-week-4/issues"
+  },
+  "homepage": "https://github.com/pavel-tisner/c55-core-week-4#readme",
+  "dependencies": {
+    "chalk": "^5.6.2"
+  },
+  "devDependencies": {
+    "prettier": "^3.8.1"
+  },
+  "type": "module"
+}