chapter 2: initial samples

Chapter02/interfacing-with-io/greeting.js

@@ -0,0 +1,4 @@
+process.stdin.on('data', (data) => {
+    let name = data.toString().trim().toUpperCase();
+    process.stdout.write(`Hello ${name}!`);   
+});

Chapter02/interfacing-with-io/greeting2.js

@@ -0,0 +1,8 @@
+process.stdin.on('data', data => {
+    let name = data.toString().trim().toUpperCase();
+    if (name != '') {
+        process.stdout.write(`Hello ${name}!`);
+    } else {
+        process.stderr.write('Input was empty.');
+    }
+});