diff --git a/js-oop.js b/js-oop.js
index 954f95b..d3f2f60 100755
--- a/js-oop.js
+++ b/js-oop.js
@@ -172,6 +172,30 @@
 
 	var a = new A()
 
+// The above aproach has one rather big flaw -- if called without new
+// it will modify the root contect (i.e. window or global)
+// A safer way to define a constructor:
+
+	function A(){
+		return {
+			__proto__: A.prototype,
+			x: 1,
+			y: 2,
+		}
+	}
+
+	var a = new A()
+	var a = A()
+
+	// XXX a way to check if we are running in a new context...
+	function A(){
+		var obj = this instanceof A ?
+			this
+			: { __proto__: A.prototype }
+		obj.x = 1
+		obj.y = 2
+		return obj
+	}
 
 // Some terminology:
 // - in the above use-case 'A' is called a constructor,
diff --git a/js-types-n-oop.js b/js-types-n-oop.js
new file mode 100644
index 0000000..5e1230e
--- /dev/null
+++ b/js-types-n-oop.js
@@ -0,0 +1,81 @@
+
+/**********************************************************************
+* 
+* JavaScript types and objects
+*
+*
+**********************************************************************/
+
+
+// Basic values
+// ============
+//
+// numbers
+	var integer = 123
+	var floating_point = 3.1415
+	var hex = 0xFF
+
+// strings
+	var string = 'string'
+	var another_string = "also a string"
+	var template = `
+		a template string.
+		this can include \\n's
+		also summorts expansions ${ '.' }`
+
+// boolieans
+	var t = true
+	var f = false
+
+// nulls
+	var n = null
+	var u = undefined
+	var not_a_number = NaN
+
+
+
+// Values are in general:
+//
+// - singletons
+	var a = 3.14
+	var b = 3.14
+	a === b // -> true
+
+	// In general equal basic values are the same value and there is 
+	// no way to create two copies of the same value.
+
+
+// - imutable
+	var a = 1
+	var b = a
+
+	// a and b hold the same value (1)
+	a === b // -> true
+
+	// now we update a...
+	a += 1
+	a === b // -> false
+	// Note that we updated the value referenced by a, i.e. the old 
+	// value (1) was not modified by the addition (b is still 1), 
+	// rather a new value (2) was created and assigned to a.
+	
+
+
+// Objects
+// =======
+//
+//
+
+// Prototypes and inheritance
+// --------------------------
+//
+//
+
+// Constructors
+// ------------
+//
+//
+
+
+/**********************************************************************
+*                                                vim:set ts=4 sw=4 : */