Chapter 2: edits

Chapter02/working-with-files/readWriteAsyncTimeout.js

@@ -0,0 +1,23 @@
+const fs = require("fs");
+const path = require("path");
+
+const filepath = path.join(process.cwd(), "hello.txt");
+
+fs.readFile(filepath, "utf8", function (err, contents) {
+  if (err) {
+    return console.log(err);
+  }
+  console.log("File Contents:", contents);
+  const upperContents = contents.toUpperCase();
+
+  setTimeout(() => updateFile(filepath, upperContents), 10);
+});
+
+function updateFile(filepath, contents) {
+  fs.writeFile(filepath, contents, function (err) {
+    if (err) throw err;
+    console.log("File updated.");
+  });
+}
+
+setInterval(() => process.stdout.write("**** \n"), 1).unref();