diff --git a/javascript/Javascript Expert/chapter10/defaultParameters.js b/javascript/Javascript Expert/chapter10/defaultParameters.js
new file mode 100644
index 0000000..10fcabd
--- /dev/null
+++ b/javascript/Javascript Expert/chapter10/defaultParameters.js
@@ -0,0 +1,23 @@
+"use strict";
+
+const bookings = [];
+
+// default parameters
+// wenn eine solche Methode keinen Wert ins Argument (numPassengers, price) bekommnt(undefined), wird ein "default" Wert berücksichtigt, in unserem Fall werden (NumPassengers=1, price = 199* numPassengers) sein
+const createBooking = function (
+ fligtNumber,
+ numPassengers = 1,
+ price = 199 * numPassengers
+) {
+ const booking = {
+ fligtNumber,
+ numPassengers,
+ price,
+ };
+ console.log(booking);
+ bookings.push(booking);
+};
+
+createBooking("LH123");
+createBooking("LH123", 6, 900);
+createBooking("LH123", undefined, 250);
diff --git a/javascript/Javascript Expert/chapter10/index.html b/javascript/Javascript Expert/chapter10/index.html
new file mode 100644
index 0000000..2437d9c
--- /dev/null
+++ b/javascript/Javascript Expert/chapter10/index.html
@@ -0,0 +1,11 @@
+
+
+
+
+
+
+ A closer look at functions
+
+
+
+