From c975ad90fedcfc338b1c647651cc2c54a37f3495 Mon Sep 17 00:00:00 2001
From: "dagimgit config --global user.email dagimvanhaileselassie@gmail.com"
 <hackyourfuture@HackYourFutures-MacBook-Pro.local>
Date: Wed, 4 Feb 2026 20:55:35 +0100
Subject: [PATCH 1/4] feat: implement core finance tracking logic reporting

---
 .prettierrc                |  1 +
 finance-tracker/app.js     | 39 ++++++++++++++++-
 finance-tracker/data.js    | 45 +++++++++++++++++++-
 finance-tracker/finance.js | 58 +++++++++++++++++++++----
 package-lock.json          | 86 ++++++++++++++++++++++++++++++++++++++
 package.json               | 24 +++++++++++
 6 files changed, 242 insertions(+), 11 deletions(-)
 create mode 100644 .prettierrc
 create mode 100644 package-lock.json
 create mode 100644 package.json

diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 0000000..868c1e4
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1 @@
+{ "semi": true, "singleQuote": true }
diff --git a/finance-tracker/app.js b/finance-tracker/app.js
index 7cfcd07..74fc81f 100644
--- a/finance-tracker/app.js
+++ b/finance-tracker/app.js
@@ -1,3 +1,38 @@
-// This is the entrypoint for your application.
-// node app.js
+const chalk = require('chalk');
+const {
+  getTotalIncome,
+  getTotalExpenses,
+  getBalance,
+  getLargestExpense,
+  printAllTransactions,
+} = require('./finance');
 
+// HEADER
+console.log(chalk.bold('\n💰 PERSONAL FINANCE TRACKER 💰'));
+
+// ALL TRANSACTIONS
+console.log('\nAll Transactions:');
+printAllTransactions();
+
+// SUMMARY HEADER
+console.log(chalk.bold('\n📊 FINANCIAL SUMMARY 📊'));
+
+const income = getTotalIncome();
+const expenses = getTotalExpenses();
+const balance = getBalance();
+
+console.log(`Total Income: ${chalk.green('€' + income)}`);
+console.log(`Total Expenses: ${chalk.red('€' + expenses)}`);
+
+// Balance color logic
+const balanceColor = balance >= 0 ? chalk.cyan : chalk.red;
+console.log(`Current Balance: ${balanceColor('€' + balance)}`);
+
+// LARGEST EXPENSE & COUNT
+const largest = getLargestExpense();
+console.log(
+  `\nLargest Expense: ${chalk.yellow(largest.description)} (${chalk.red('€' + largest.amount)})`,
+);
+// Use the .length property of the transactions array we imported
+const transactions = require('./data');
+console.log(`Total Transactions: ${transactions.length}\n`);
diff --git a/finance-tracker/data.js b/finance-tracker/data.js
index d7863ff..8f44322 100644
--- a/finance-tracker/data.js
+++ b/finance-tracker/data.js
@@ -1,2 +1,45 @@
 // Place here the transaction data array. Use it in your application as needed.
-const transactions = [];
\ No newline at end of file
+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: '2025-01-16',
+  },
+  {
+    id: 3,
+    type: 'expense',
+    category: 'food',
+    amount: 300,
+    description: 'Groceries',
+    date: '2025-01-17',
+  },
+  {
+    id: 4,
+    type: 'income',
+    category: 'side-income',
+    amount: 500,
+    description: 'Freelance',
+    date: '2025-01-18',
+  },
+  {
+    id: 5,
+    type: 'expense',
+    category: 'bills',
+    amount: 150,
+    description: 'Utilities',
+    date: '2025-01-19',
+  },
+];
+
+module.exports = transactions;
diff --git a/finance-tracker/finance.js b/finance-tracker/finance.js
index ac2118f..c2625f2 100644
--- a/finance-tracker/finance.js
+++ b/finance-tracker/finance.js
@@ -1,27 +1,69 @@
+const transactions = require('./data');
+
 function addTransaction(transaction) {
-  // TODO: Implement this function
+  return [...transactions, transaction];
 }
 
 function getTotalIncome() {
-  // TODO: Implement this function
+  let total = 0;
+  for (const tx of transactions) {
+    if (tx.type === 'income') {
+      total += tx.amount;
+    }
+  }
+  return total;
 }
 
 function getTotalExpenses() {
-  // TODO: Implement this function
+  let total = 0;
+  for (const tx of transactions) {
+    if (tx.type === 'expense') {
+      total += tx.amount;
+    }
+  }
+  return total;
 }
 
 function getBalance() {
-  // TODO: Implement this function
+  return getTotalIncome() - getTotalExpenses();
 }
 
 function getTransactionsByCategory(category) {
-  // TODO: Implement this function
+  const filtered = [];
+  for (const tx of transactions) {
+    if (tx.category === category) {
+      filtered.push(tx);
+    }
+  }
+  return filtered;
 }
 
 function getLargestExpense() {
-  // TODO: Implement this function
+  let largest = { amount: 0, description: 'None' };
+
+  for (const tx of transactions) {
+    // Check if it is an expense AND if it's larger than our current record
+    if (tx.type === 'expense' && tx.amount > largest.amount) {
+      largest = tx;
+    }
+  }
+  return largest;
 }
 
 function printAllTransactions() {
-  // TODO: Implement this function
-}
\ No newline at end of file
+  transactions.forEach((tx, index) => {
+    console.log(
+      `${index + 1}. [${tx.type.toUpperCase()}] ${tx.description} - €${tx.amount} (${tx.category})`,
+    );
+  });
+}
+
+module.exports = {
+  addTransaction,
+  getTotalIncome,
+  getTotalExpenses,
+  getBalance,
+  getTransactionsByCategory,
+  getLargestExpense,
+  printAllTransactions,
+};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..52239c6
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,86 @@
+{
+  "name": "c55-core-week-4",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "c55-core-week-4",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "chalk": "^4.1.2"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "license": "MIT",
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "license": "MIT",
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+      "license": "MIT"
+    },
+    "node_modules/has-flag": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
+      "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "license": "MIT",
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..956b005
--- /dev/null
+++ b/package.json
@@ -0,0 +1,24 @@
+{
+  "name": "c55-core-week-4",
+  "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": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/Dagim02/c55-core-week-4.git"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "bugs": {
+    "url": "https://github.com/Dagim02/c55-core-week-4/issues"
+  },
+  "homepage": "https://github.com/Dagim02/c55-core-week-4#readme",
+  "dependencies": {
+    "chalk": "^4.1.2"
+  }
+}

From e40724b6efde570b51946ff1b68f6d277e4b52b2 Mon Sep 17 00:00:00 2001
From: "Dagim H." <dagimvanhaileselassie@gmail.com>
Date: Wed, 4 Feb 2026 21:03:54 +0100
Subject: [PATCH 2/4] Update data.js

---
 finance-tracker/data.js | 1 -
 1 file changed, 1 deletion(-)

diff --git a/finance-tracker/data.js b/finance-tracker/data.js
index 8f44322..24b1087 100644
--- a/finance-tracker/data.js
+++ b/finance-tracker/data.js
@@ -1,4 +1,3 @@
-// Place here the transaction data array. Use it in your application as needed.
 const transactions = [
   {
     id: 1,

From 4feeffa9dfa4d422b95fafd7833329476110086a Mon Sep 17 00:00:00 2001
From: Dagim02 <dagimvanhaileselassie@gmail.com>
Date: Mon, 2 Mar 2026 10:31:45 +0100
Subject: [PATCH 3/4] update: correctionOnWeek-4

---
 .prettierrc                |  6 +++++-
 finance-tracker/app.js     |  9 +++++----
 finance-tracker/finance.js | 40 ++++++++++++++++----------------------
 package-lock.json          | 19 ++++++++++++++++++
 package.json               |  3 +++
 5 files changed, 49 insertions(+), 28 deletions(-)

diff --git a/.prettierrc b/.prettierrc
index 868c1e4..1d296fb 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -1 +1,5 @@
-{ "semi": true, "singleQuote": true }
+{
+  "semi": true,
+  "singleQuote": true,
+  "tabWidth": 2
+}
diff --git a/finance-tracker/app.js b/finance-tracker/app.js
index 74fc81f..f566196 100644
--- a/finance-tracker/app.js
+++ b/finance-tracker/app.js
@@ -1,4 +1,6 @@
 const chalk = require('chalk');
+const transactions = require('./data');
+
 const {
   getTotalIncome,
   getTotalExpenses,
@@ -28,11 +30,10 @@ console.log(`Total Expenses: ${chalk.red('€' + expenses)}`);
 const balanceColor = balance >= 0 ? chalk.cyan : chalk.red;
 console.log(`Current Balance: ${balanceColor('€' + balance)}`);
 
-// LARGEST EXPENSE & COUNT
+// largest expenses and total
 const largest = getLargestExpense();
 console.log(
-  `\nLargest Expense: ${chalk.yellow(largest.description)} (${chalk.red('€' + largest.amount)})`,
+  `\nLargerst Expenses: ${chalk.yellow(largest.description)} (${chalk.red('€' + largest.amount)})`,
 );
-// Use the .length property of the transactions array we imported
-const transactions = require('./data');
+
 console.log(`Total Transactions: ${transactions.length}\n`);
diff --git a/finance-tracker/finance.js b/finance-tracker/finance.js
index c2625f2..89a53fc 100644
--- a/finance-tracker/finance.js
+++ b/finance-tracker/finance.js
@@ -5,22 +5,19 @@ function addTransaction(transaction) {
 }
 
 function getTotalIncome() {
-  let total = 0;
-  for (const tx of transactions) {
-    if (tx.type === 'income') {
-      total += tx.amount;
-    }
-  }
+  const total = transactions.reduce(
+    (total, tx) => (tx.type === 'income' ? total + tx.amount : total),
+    0,
+  );
+
   return total;
 }
 
 function getTotalExpenses() {
-  let total = 0;
-  for (const tx of transactions) {
-    if (tx.type === 'expense') {
-      total += tx.amount;
-    }
-  }
+  const total = transactions.reduce(
+    (total, tx) => (tx.type === 'expense' ? total + tx.amount : total),
+    0,
+  );
   return total;
 }
 
@@ -29,24 +26,21 @@ function getBalance() {
 }
 
 function getTransactionsByCategory(category) {
-  const filtered = [];
-  for (const tx of transactions) {
-    if (tx.category === category) {
-      filtered.push(tx);
-    }
-  }
-  return filtered;
+  const getByCatagory = transactions.filter((tx) => tx.category === category);
+  return getByCatagory;
 }
 
 function getLargestExpense() {
-  let largest = { amount: 0, description: 'None' };
-
+  let largest = null;
   for (const tx of transactions) {
-    // Check if it is an expense AND if it's larger than our current record
-    if (tx.type === 'expense' && tx.amount > largest.amount) {
+    if (
+      tx.type === 'expense' &&
+      (largest === null || tx.amount > largest.amount)
+    ) {
       largest = tx;
     }
   }
+
   return largest;
 }
 
diff --git a/package-lock.json b/package-lock.json
index 52239c6..228d484 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,9 @@
       "license": "ISC",
       "dependencies": {
         "chalk": "^4.1.2"
+      },
+      "devDependencies": {
+        "prettier": "^3.8.1"
       }
     },
     "node_modules/ansi-styles": {
@@ -70,6 +73,22 @@
         "node": ">=8"
       }
     },
+    "node_modules/prettier": {
+      "version": "3.8.1",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.8.1.tgz",
+      "integrity": "sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
     "node_modules/supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
diff --git a/package.json b/package.json
index 956b005..9e16bf2 100644
--- a/package.json
+++ b/package.json
@@ -20,5 +20,8 @@
   "homepage": "https://github.com/Dagim02/c55-core-week-4#readme",
   "dependencies": {
     "chalk": "^4.1.2"
+  },
+  "devDependencies": {
+    "prettier": "^3.8.1"
   }
 }

From 55c49da71a604693fd7f6d99c9a9ddd8a47818d8 Mon Sep 17 00:00:00 2001
From: Dagim02 <dagimvanhaileselassie@gmail.com>
Date: Mon, 2 Mar 2026 11:36:52 +0100
Subject: [PATCH 4/4] update:UsingShorterMethod-prettier

---
 .prettierrc                |  6 +++---
 finance-tracker/app.js     |  6 +++---
 finance-tracker/finance.js | 16 ++++++----------
 3 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/.prettierrc b/.prettierrc
index 1d296fb..b423197 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -1,5 +1,5 @@
 {
-  "semi": true,
-  "singleQuote": true,
-  "tabWidth": 2
+   "semi": true,
+   "singleQuote": true,
+   "tabWidth": 2
 }
diff --git a/finance-tracker/app.js b/finance-tracker/app.js
index f566196..d62b218 100644
--- a/finance-tracker/app.js
+++ b/finance-tracker/app.js
@@ -9,14 +9,14 @@ const {
   printAllTransactions,
 } = require('./finance');
 
-// HEADER
+// Header
 console.log(chalk.bold('\n💰 PERSONAL FINANCE TRACKER 💰'));
 
-// ALL TRANSACTIONS
+// All Transactions
 console.log('\nAll Transactions:');
 printAllTransactions();
 
-// SUMMARY HEADER
+// Summary Header
 console.log(chalk.bold('\n📊 FINANCIAL SUMMARY 📊'));
 
 const income = getTotalIncome();
diff --git a/finance-tracker/finance.js b/finance-tracker/finance.js
index 89a53fc..ed81656 100644
--- a/finance-tracker/finance.js
+++ b/finance-tracker/finance.js
@@ -31,16 +31,12 @@ function getTransactionsByCategory(category) {
 }
 
 function getLargestExpense() {
-  let largest = null;
-  for (const tx of transactions) {
-    if (
-      tx.type === 'expense' &&
-      (largest === null || tx.amount > largest.amount)
-    ) {
-      largest = tx;
-    }
-  }
-
+  const largest = transactions
+    .filter((tx) => tx.type === 'expense')
+    .reduce(
+      (max, tx) => (max === null || tx.amount > max.amount ? tx : max),
+      null,
+    );
   return largest;
 }