add back dart:mirrors content, remove dart:isolate, misc. tweaks/updates

code/ch03/mirrors.dart

 import 'dart:mirrors';
 
 askUserForNameOfFunction() => 'foo';
 
 class Person {
   String firstName;
   String lastName;
   int age;
   
   Person(this.firstName, this.lastName, this.age);
-  Person.noFirstName(this.lastName, this.age);
 
   String get fullName => '$firstName $lastName';
 
   void greet(String other) {
     print('Hello there, $other!');
   }
 }
 
 main() {
   // If the symbol name is known at compile time.
@@ skipping 12 matching lines @@
 
   reflectFromInstance();
   showConstructors(mirror);
   showFields(mirror);
   reflectOnInstance();
 }
 
 reflectFromInstance() {
   var person = new Person('Bob', 'Smith', 33);
   ClassMirror mirror = reflectClass(person.runtimeType);
+  assert('Person' == MirrorSystem.getName(mirror.simpleName));
 }
 
 showConstructors(ClassMirror mirror) {
   var methods = mirror.declarations.values.where((m) => m is MethodMirror);
   var constructors = methods.where((m) => m.isConstructor);
   
   constructors.forEach((m) {
     print('The constructor ${m.simpleName} has ${m.parameters.length} parameters.');
   });
 }
 
 showFields(ClassMirror mirror) {
   var fields = mirror.declarations.values.where((m) => m is VariableMirror);
 
   fields.forEach((VariableMirror m) {
     var finalStatus = m.isFinal ? 'final' : 'not final';
     var privateStatus = m.isPrivate ? 'private' : 'not private';
     var typeAnnotation = m.type.simpleName;
 
     print('The field ${m.simpleName} is $privateStatus and $finalStatus and is annotated '
           'as $typeAnnotation');
   });
 }
 
 reflectOnInstance() {
   var p = new Person('Bob', 'Smith', 42);
   InstanceMirror mirror = reflect(p);
 
+  // Get the object that the mirror reflects.
   var person = mirror.reflectee;
   assert(identical(p, person));
+
+  // Invoke a method on the object.
+  mirror.invoke(#greet, ['Shailen']);
+
+  // Get the value of a property.
+  var fullName = mirror.getField(#fullName).reflectee;
+  assert(fullName == 'Bob Smith');
+  
+  // Set the value of a property.
+  mirror.setField(#firstName, 'Mary');
+  assert(p.firstName == 'Mary');
+  assert(p.fullName == 'Mary Smith');
 }