Finally get around and start fixing some issues

Author: BonsaiDen

doc/en/core/undefined.md

@@ -19,11 +19,13 @@ overwritten.
 Some examples for when the value `undefined` is returned:
 
  - Accessing the (unmodified) global variable `undefined`.
+ - Accessing a declared *but not* yet initialized variable
  - Implicit returns of functions due to missing `return` statements.
  - `return` statements which do not explicitly return anything.
  - Lookups of non-existent properties.
  - Function parameters which do not had any explicit value passed.
  - Anything that has been set to the value of `undefined`.
+ - Any expression in the form of `void(expression)`
 
 ### Handling Changes to the Value of `undefined`
 

doc/en/function/constructors.md

@@ -4,7 +4,7 @@ Constructors in JavaScript are yet again different from many other languages. An
 function call that is preceded by the `new` keyword acts as a constructor.
 
 Inside the constructor - the called function - the value of `this` refers to a 
-newly created `Object`. The [`prototype`](#object.prototype) of this **new** 
+newly created object. The [prototype](#object.prototype) of this **new** 
 object is set to the `prototype` of the function object that was invoked as the
 constructor.
 

doc/en/function/scopes.md

@@ -2,7 +2,7 @@
 
 Although JavaScript deals fine with the syntax of two matching curly
 braces for blocks, it does **not** support block scope; hence, all that is left 
-is in the language is *function scope*.
+in the language is *function scope*.
 
     function test() { // a scope
         for(var i = 0; i < 10; i++) { // not a scope
@@ -213,12 +213,14 @@ being callable, they must first be evaluated.
     ) // and return the function object
     () // call the result of the evaluation
 
-There are other ways for evaluating and calling the function expression; which, 
+There are other ways for evaluating and directly calling the function expression; which, 
 while different in syntax, do behave the exact same way.
 
-    // Two other ways
-    +function(){}();
+    // A few other styles for directly invoking the 
+    !function(){}()
+    +function(){}()
     (function(){}());
+    // and so on...
 
 ### In Conclusion
 

doc/en/object/hasownproperty.md

@@ -44,6 +44,10 @@ necessary to use an *external* `hasOwnProperty` in order to get correct results.
     // Use another Object's hasOwnProperty and call it with 'this' set to foo
     ({}).hasOwnProperty.call(foo, 'bar'); // true
 
+    // It's also possible use the hasOwnProperty property from the Object property for this purpuse
+    Object.prototype.hasOwnProperty.call(obj, 'bar'); // true
+
+
 ### In Conclusion
 
 When checking for the existence of a property on a object, `hasOwnProperty` is