diff --git a/dirty-control-structures.js b/dirty-control-structures.js
new file mode 100644
index 0000000..e1f06aa
--- /dev/null
+++ b/dirty-control-structures.js
@@ -0,0 +1,142 @@
+main();
+
+function main() {
+  const transactions = [
+    {
+      id: 't1',
+      type: 'PAYMENT',
+      status: 'OPEN',
+      method: 'CREDIT_CARD',
+      amount: '23.99',
+    },
+    {
+      id: 't2',
+      type: 'PAYMENT',
+      status: 'OPEN',
+      method: 'PAYPAL',
+      amount: '100.43',
+    },
+    {
+      id: 't3',
+      type: 'REFUND',
+      status: 'OPEN',
+      method: 'CREDIT_CARD',
+      amount: '10.99',
+    },
+    {
+      id: 't4',
+      type: 'PAYMENT',
+      status: 'CLOSED',
+      method: 'PLAN',
+      amount: '15.99',
+    },
+  ];
+
+  processTransactions(transactions);
+}
+
+function processTransactions(transactions) {
+  if (isEmpty(transactions)){
+    showErrorMessage('No transacations provided');
+    return;
+  }
+ 
+    for (const transaction of transactions) {
+      processTransaction(transaction);
+    }
+  }
+function isEmpty(transactions) {
+  return !transactions || transcations.length === 0;
+}
+
+function showErrorMessage(message, item) {
+ console.log(message); 
+  if (item) {
+    console.log(item);
+  }
+}
+
+function processTransaction(transaction) {
+  if (!isOpen(transaction)) {
+          showErrorMessage('Invalid transaction type!');
+          return;
+        }
+          if(isPayment(transaction)) {
+            processPayment(transaction); 
+      } else if (isRefund(transaction)) {
+         processRefund(transaction);
+      } else {
+        showErrorMessage('Invalid transaction type!', transaction);
+      }
+  
+}
+  
+  function isOpen(transaction) {
+   return transaction.status === 'OPEN'; 
+  }
+
+function usesCreditCard(transaction) {
+ return transaction.method === 'CREDIT_CARD' ;
+}
+function usesPayPal(transaction) {
+ return transaction.method === 'PAYPAL' ;
+}
+function usesPlan(transaction) {
+ return transaction.method === 'PLAN' ;
+}
+function isPayment(transaction) {
+ return transaction.type === 'PAYMENT'; 
+}
+
+function isRefund(transaction) {
+  return transaction.type ==='REFUND';
+}
+
+function processPayment(paymentTransaction){
+   if (transaction.method === 'CREDIT_CARD') {
+            processCreditCardPayment(paymentTransaction);
+          } else if (transaction.method === 'PAYPAL') {
+            processPayPalPayment(paymentTransaction);
+          } else if (transaction.method === 'PLAN') {
+            processPlanPayment(paymentTransaction);
+          }
+  
+}
+  
+  function processRefund(refundTransaction) {
+    if (transaction.method === 'CREDIT_CARD') {
+            processCreditCardRefund(refundTransaction);
+          } else if (refundTransaction.method === 'PAYPAL') {
+            processPayPalRefund(refundTransaction);
+          } else if (refundTransaction.method === 'PLAN') {
+            processPlanRefund(refundTransactionn);
+          } 
+  }
+
+function processCreditCardPayment(transaction) {
+  console.log(
+    'Processing credit card payment for amount: ' + transaction.amount
+  );
+}
+
+function processCreditCardRefund(transaction) {
+  console.log(
+    'Processing credit card refund for amount: ' + transaction.amount
+  );
+}
+
+function processPayPalPayment(transaction) {
+  console.log('Processing PayPal payment for amount: ' + transaction.amount);
+}
+
+function processPayPalRefund(transaction) {
+  console.log('Processing PayPal refund for amount: ' + transaction.amount);
+}
+
+function processPlanPayment(transaction) {
+  console.log('Processing plan payment for amount: ' + transaction.amount);
+}
+
+function processPlanRefund(transaction) {
+  console.log('Processing plan refund for amount: ' + transaction.amount);
+}