Create fs_module_examples.js

fs_module_examples.js

@@ -0,0 +1,57 @@
+// This is my way of extending the learning of the FS section of the course.  
+// It implements simple things like additional checks to be sure a directory doesn't exist, arrow functions in JS, 
+//   so that we can reuse, and passing in well named parameters for ease of use. 
+
+const path = require("path"); // built in node path module.
+const fs = require("fs"); //built in file system module.
+
+
+//make directory.
+const newDir = (directoryName) => {
+    // confirm the folder doesn't exist before continuing.  
+  if (path.join(__dirname, directoryName) === true) {
+    console.log(`Error: ${directoryName} already exists.`);
+  } 
+    // if it doesn't exist, create it and confirm it. 
+    else {
+            fs.mkdir(path.join(__dirname, directoryName), {}, (err) => {
+            if (err) throw err;
+            console.log(directoryName, " created.");
+            });
+        }
+};
+
+// write a file.
+const writeAFile = (folder, nameForFile, dataToWrite) => {
+  fs.writeFile(
+    path.join(__dirname, folder, nameForFile),dataToWrite, err => {
+      if (err) throw err;
+      console.log("File successfully created.");
+    });
+};
+
+
+// append to a file.
+const appendToFile = (folder, file, text) => {
+  fs.appendFile(path.join(__dirname, folder, file), `\n${text}`, (err) => {
+    if (err) throw err;
+    console.log(`Appended ${text} to ${file} in ${folder}`);
+  });
+};
+
+
+// read a file.
+const readAFile = (folder,file, encoding) => {
+    fs.readFile(path.join(__dirname, folder, file), encoding, (err, data) => {
+        if(err) throw err; 
+            console.log(data); 
+    }); 
+}
+
+// Rename A file 
+const renameFile = (folder, oldName, newName) => {
+    fs.rename(path.join(__dirname, folder, oldName), path.join(__dirname, folder, newName), err => {
+        if(err) throw err; 
+            console.log(`Succes:  ${oldName} renamed to ${newName}.`); 
+    }); 
+};