Lesson 2

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• Lessons

  I downloaded a few guitar lessons in GarageBand I want to delete them now I'm done. Can't see how to do it! Is it possible to erase the guitar?

  I discovered through an old thread

• How to remove lessons and instruments GarageBand?

  Hello, I'm under macOS 10.12 and storage management, he said that "lessons and instruments GarageBand using 1.02 GB. You can manage these files using GarageBand. "I haven't even installed GarageBand, so, how do I get rid of him completely?

  It is 2.92 G in my case and I found some files:

  of the $-sh "/ Library/Application Support/GarageBand '"

  843 M/Library/Application Support/GarageBand

  Looks like it's exactly the lessons.

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• Lesson store does not.

  I recently bought the upgrade of garageband so that I can buy piano lessons. Whenever I try to access the store of the lesson, it is "temporarily unavailable". Also, when I'm in Garageband options in my menu bar are all gray-unusable. Help, please.

  It was thus for a few days now, see this similar discussion: Garageband lesson store is actually unavailable?

  Send feedback to Apple with a bug report: Apple - GarageBand Mac-Feedback

• Is the Garageband lesson store actually unavailable?

  After graduating with a MIDI keyboard, I wanted to learn to play, I downloaded garageband and finished the basic lesson, then when I click on the lesson store get this:

  

  Its been 3 days now, any ideas?

  I get the same in Germany:

  

  But the system status page is list all the services store as available: Apple - Support - system status

• I have e he sent videos of my golf lessons, files have an extension of file of the woman, but I can't open them.

  I have e he sent videos of my golf lessons, files have an extension of file of the woman, but I can't open them.

  Any help would be apprecaited.

  original title: the woman's file extension

  I was not able to find any other references to this type of file regarding a video.

  You can try to contact the person who sent the videos and ask them.

• Fatal error when you try to select a mission. FreeFlight and lessons works well.

  I have the same probem as Paxer under my flight Sim X works well in free flight and lessons, but cannot work assignments. The program has a fatal error and restart. I'm a developer, and I think that it's link to the XML parser. Because FSX load a page of explanation before you run the simulation. I have install SDK beta 1 so perhaps FSX try to use a DLL bugged. I don't think it's a very big problem. He can't read the explanation Page just before the game. But I'm not a developer of Microsoft FSX.  My system
  Core i7 860 P7p55 deluxe ATI XFX HD 5870 Windows 7 64 bit, 8 GB of DDR3 memory

  Hi Chris,

  I would like to gather more information.

  1. from when are you facing this problem?

  2. don't you make changes on your operating system?

  3. when it last work very well?

  You can try to uninstall and reinstall the game and let us know the answer.

  Thank you and best regards,

  Bindu S - MICROSOFT SUPPORT
  Visit our Microsoft answers feedback Forum and let us know what you think.

• playing video lessons stalls every 10 seconds, then play again, cycling in and out

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  HTH,
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• The last call wins - Lesson 3-5

  In the 3-5 lesson is taught (as in Lesson 2) If a stream is parallel or sequential:

  "The last call wins."

  I remember from Lesson 1 which, in the order of operations of programming functional don't display the contract / meaning of the code.

  What exactly is the definition of the "last call"?

  It is for:

  • Time of execution
  • Compile time
  • Time of coding

  The answer is the compile time.  The generated code for the pipeline will be either all sequential or parallel all depending on what the last change in the sequence of method calls is.  It is has no concept in streams of JDK 8 to part of this run in parallel.

• Lesson 1 - Lambda expression syntax

  Hello:

  I'm trying to code a Hello everyone using lambda expression but I get an error, this is the code:

  public class {Lesson1

  /**

  @param args command-line arguments

  */

  Public Shared Sub main (String [] args) {}

  Call();

  }

  private public static call() Sub {}

  ()-> System.out.println ("Hello world!");

  }

  }

  I get a compilation error not a statement

  and of course, if I run it, I get: Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - not a statement

  I use the syntax that is in course-1 - 2.pdf, page 3

  What I am doing wrong?

  Lambda expressions are meant to be used somewhere and are not allowed to be right on their own line/statement. It's hard to explain, since known functional interfaces that is in a later lesson.

  Fortunately, the functional interface in your example is passable. Is not new in Java 8. Here is a concrete example of what you're trying to do:

      publicstaticvoid main(String[] args) {
          call(() -> System.out.println("Hello world!"));
      }
  
      private static void call(Runnable r) {
        r.run();
      }
  

• Why declare the abstract modifier? -Lesson 1-3 slide 5

  In Lesson 1-3 slide 5 the abstract modifier is said for the target method.

  Why was this doen? You need the JDK from 8 types of functional interface? What is always optional and strongly discouraged?

  The JLS says:

  http://Java.Sun.com/docs/books/JLS/second_edition/HTML/interfaces.doc.html

  9.1.1.1 abstract interfaces each interface is implicitly abstract. This modifier is obsolete and should not be used in new programs.

  And

  9.4 abstract method declarations

  [...]

  For compatibility with older versions of the Java platform, it is allowed but not recommended, as a matter of style, to redundantly specify the modifier abstract for methods declared in interfaces.

  It is permitted, but strongly discouraged as a matter of style, to redundantly specify the public modifier for interface methods.

  The example in the slide is:

  @FunctionalInterface
  public interface Runnable {
      public abstract void run();
  }
  

  It is true that using "public" and "abstract" on the declarations of interface method is no longer the preferred form, I see that the real source code contains these modifiers! The executable is a very old interface. It was introduced before the JDK 1.0 and indeed that these lines has not changed since its first archived before the JDK 1.0 release. I suspect that Simon may have simply copied this statement directly from source code.

• Lesson 1-1 code is correct?

  Hi all.

  I just started watching a course and have finished all the chapters of lesson 1, no homework and quiz.

  So we in Lesson 1-1 example usage of lambda expressions (with my method createStudentsList() to fill the list):

  Students list < student > = createStudentsList();

  Double highestScore = 0.0;

  for (s student: students) {}

  If (s.getGradYear () == 2011) {}

  If (s.getScore () > highestScore) {}

  highestScore = s.getScore ();

  }

  }

  }

  It compiles and works.

  But the proposed changes by using lambda expressions does not work:

  Students list < student > = createStudentsList();

  Double highestScore = student

  filter (new predicate < student > () {})

  public boolean test (Student's t) {}

  return t.getGradYear () is 2011;

  }

  })

  .map (Mapper new student, < Double > () {})

  public Double extracted (student s) {}

  Return s.getScore ();

  }

  })

  . Max();

  saying "the filter method (new predicate < student > () {}) is undefined for the type List < student >" and "Mapper cannot be resolved to a type.

  Even the latest version of the code does not compile:

  Students list < student > = createStudentsList();

  highestScore = student

  filter (student s-> s.getGradYear () == 2011)

  .map (student s-> s.getScore ())

  . Max();

  with "syntax error, insert ';' to complete the statement" for the two statements of student.

  I managed to make it work with this approach:

  Students list < student > = createStudentsList();

  Double highestScoreL = student

  . Stream()

  filter (s-> s.getGradYear () == 2011)

  .mapToDouble (s-> s.getScore ())

  . Max()

  . getAsDouble();

  I do wrong or just missed sth sth important? Sorry for the question so long - it is because as pieces of code .

  BTW I use Eclipse March 4.5.0 and jdk1.8.0_51 if that matters.

  There is problem with your code. I fixed your code and it would be:

  Student s0 = new Student(2014, 685);

  Student s1 = new Student(2014, 675);

  Student s2 = new Student(2014, 635);

  Student s3 = new Student(2014, 985);

  List of students of = Arrays.asList (s0, s1, s2, s3);

  Stream studentStream;

  studentStream = students.stream ().

  filter (new predicate() {}

  @Override

  public boolean test (Student's t) {}

  return t.getGradYear () is 2014;

  }

  });

  Stream highestScoreStream = studentStream.map (new function() {}

  @Override

  public Double apply (student s) {}

  Return s.getScore ();

  }

  });

  HighScore = highestScoreStream.max of in option (new comparator() {}

  @Override

  public int compare (Double d1, d2 Double) {}

  Return d1.compareTo (d2);

  }

  });

  Double highestScore = highScore.get ();

  System.out.println (highestScore);

  Make sure and tell me if you don't get anything. This is the detailed code pre JDK8 average. Now you can write it as functional programming.

  and Yes... The video code is just for us to understand. It is not syntactically correct as map is not a FunctionalInterface in JDK8.

• There is no green checkmarks in Lesson 2

  Hello

  I don't see green checkmarks in Lesson 2 in different browsers after all lessons and quizzes. I tested it in three browsers and in each of them I was connected.

  Hello

  Good news... they added a small section of my results on the lessons page.

  Great!

• Second lesson

  Hello

  Anyone know when will begin the second lesson?

  Lesson 2 will be released a week after lesson 1, so 7/21 to 3 pm GMT.

• Question about lesson 1-7, slide 2: Iterable.forEach () and parallel execution

  As stated in the previous parts of this lesson, the library can choose to run lambda expressions in parallel.

  In the example: the final execution using Iterable.forEach () result will be same as using a traditional loop?

  Using a traditional loop that you are sure that the items in the list are printed in the order they are in the list.

  This is not always true using Iterable.forEach (), since the items could be printed by different threads?

  "... the library can choose to perform lambda expressions in parallel."

  I wanted to clarify a little.

  The general rule is that parallel execution can occur if the particular library used API allows him, and it is usually under the control of the programmer. For example, lambdas in parallel flow (which will be addressed later in the MOOC) can be run in parallel, but the programmer must explicitly request parallelism. If the API says nothing about parallel (or asynchronous) execution, then those that don't occur.

  If Iterable.forEach runs sequentially, and the underlying class specified an order, the execution will take place in this order.