Merge pull request #64 from glaucia86/GL/9-final-solution-exercise-re…

…ad-write-files

chore: final solution exercise 09 from Module: 'Work with files and directories in a Node.js app'

nodejs-files/9-exercise-read-write-files/index-unit-9.js → nodejs-files/9-exercise-read-write-files/index.js

@@ -23,31 +23,37 @@ async function findSalesFiles(folderName) {
   // (1) Add an array at the top, to hold the paths to all the sales files that the program finds.
   let results = [];
 
-  // (2) Read the currentFolder with the `readdir` method.
-  const items = await fs.readdir(folderName, { withFileTypes: true });
+  try {
+    // (2) Read the currentFolder with the `readdir` method.
+    const items = await fs.readdir(folderName, { withFileTypes: true });
+
+    // (3) Add a block to loop over each item returned from the `readdir` function using the asynchronous `for...of` loop.
+    for (const item of items) {
+      // (4) Add an `if` statement to determine if the item is a file or a directory.
+      if (item.isDirectory()) {
+        // (5) If the item is a directory, recursively call the function `findSalesFiles` again, passing in the path to the item.
+        const resultsReturned = await findSalesFiles(
+          path.join(folderName, item.name),
+        );
+        results = results.concat(resultsReturned);
+      } else {
+        // (6) If it's not a directory, add a check to make sure the item name matches *sales.json*.
+        if (path.extname(item.name) === '.json') {
+          results.push(`${folderName}/${item.name}`);
+        }
+      }
 
-  // (3) Add a block to loop over each item returned from the `readdir` function using the asynchronous `for...of` loop.
-  for (const item of items) {
-    // (4) Add an `if` statement to determine if the item is a file or a directory.
-    if (item.isDirectory()) {
-      // (5) If the item is a directory, _resursively call the function `findSalesFiles` again, passing in the path to the item.
-      const resultsReturned = await findSalesFiles(
-        path.join(folderName, item.name),
-      );
-      results = results.concat(resultsReturned);
-    } else {
-      // (6) If it's not a directory, add a check to make sure the item name matches *sales.json*.
-      if (path.extname(item.name) === '.json')
-        results.push(`${folderName}/${item.name}`);
+      return results;
     }
+  } catch (error) {
+    console.error('Error reading folder:', error.message);
+    throw error;
   }
-
-  return results;
 }
 
 async function main() {
-  const salesDir = path.join(__dirname, 'stores');
-  const salesTotalsDir = path.join(__dirname, 'salesTotals');
+  const salesDir = path.join(__dirname, '..', 'stores');
+  const salesTotalsDir = path.join(__dirname, '..', 'salesTotals');
 
   // create the salesTotal directory if it doesn't exist
   try {

nodejs-files/9-final-solution-exercise-read-write-files/index.js

@@ -0,0 +1,62 @@
+const fs = require('fs').promises;
+const path = require('path');
+
+async function calculateSalesTotal(salesFiles) {
+  let salesTotal = 0;
+
+  for (file of salesFiles) {
+    const fileContents = await fs.readFile(file);
+    const data = JSON.parse(fileContents);
+    salesTotal += data.total;
+  }
+  return salesTotal;
+}
+
+async function findSalesFiles(folderName) {
+  let results = [];
+
+  try {
+    const items = await fs.readdir(folderName, { withFileTypes: true });
+    for (const item of items) {
+      if (item.isDirectory()) {
+        const resultsReturned = await findSalesFiles(
+          path.join(folderName, item.name),
+        );
+        results = results.concat(resultsReturned);
+      } else {
+        if (path.extname(item.name) === '.json') {
+          results.push(`${folderName}/${item.name}`);
+        }
+      }
+
+      return results;
+    }
+  } catch (error) {
+    console.error('Error reading folder:', error.message);
+    throw error;
+  }
+}
+
+async function main() {
+  const salesDir = path.join(__dirname, '..', 'stores');
+  const salesTotalsDir = path.join(__dirname, '..', 'salesTotals');
+
+  try {
+    await fs.mkdir(salesTotalsDir);
+  } catch {
+    console.log(`${salesTotalsDir} already exists.`);
+  }
+
+  const salesFiles = await findSalesFiles(salesDir);
+
+  const salesTotal = await calculateSalesTotal(salesFiles);
+
+  await fs.writeFile(
+    path.join(salesTotalsDir, 'totals.txt'),
+    `${salesTotal}\r\n`,
+    { flag: 'a' },
+  );
+  console.log(`Wrote sales totals to ${salesTotalsDir}`);
+}
+
+main();