made a mini app which you can select the demo you want from a list with an interactive prompt.

demo/index.js

@@ -0,0 +1,29 @@
+var prompt = require('prompt');
+var shelljs = require('shelljs');
+var fs = require('fs');
+
+console.log('What demo do you wish to run? (Enter a number)');
+
+var schema = {
+    properties: {
+        number: {
+            pattern: /^[0-9]+$/,
+            message: 'Please enter a number.',
+            required: true
+        }
+    }
+};
+
+prompt.start();
+
+prompt.get(schema, function (err, result) {
+    var demoNumber = result.number;
+    var filePath = `./demo/demo${demoNumber}.js`;
+
+    if (!fs.existsSync(filePath)) {
+        console.error(`demo${demoNumber} does not exist: ${filePath}`);
+        return;
+    }
+    console.log(`Running demo ${demoNumber}`);
+    shelljs.exec(`node ${filePath}`);
+});