echowuhao

Recent Actions

• Commented on Book Report - December 2014
  I am surprised that I was not aware Time::Piece before. thanks. Time::Piece has some XS in it, which will add some overhead for people who are new to OOP or Perl. Real world module is usually not that friendly to...
• Commented on XS, I Spoke too soon
  yapc talks this week. XS Fun https://www.youtube.com/watch?v=sD1-bgKm36c The Perl API for the Mortally Terrified https://www.youtube.com/watch?v=-XITNDvqoTo Foreign Function Interface (FFI): Never Need to Write XS Again https://www.youtube.com/watch?v=cY-yqQ_nmtw like you said in your last post, you learn it because you have to....
• Commented on Watch the secret YAPC::NA live
  perl people just do thing without talking about it that much....
• Commented on How to load stata and csv datasets in perl?
  sorry for the grammar errors. I can not edit my reply....
• Commented on How to load stata and csv datasets in perl?
  usually, Perl is better at the cleaning stage, and R do the analysis. the power of Perl in data cleansing, before they goes in to CSV. you may get more and quicker feedback if you asking in beginning perl mailing...
• Commented on Three ways to introduce othogonal behavior: Aspects, Method modifiers, and Subroutine attributes
  learn a lot. thanks!...
• Commented on Debuging method for perl Complex data structures
  Data::Printer is another alternative....
• Commented on NY Perlmongers Streaming
  watched the video. thanks....
• Commented on Perl 5 Internals - Part Three
  @Gabor I think undef $x is better, since it free the memory. @Rob waiting to the next episode!...
• Commented on Salt Lake Perl Mongers welcome Damian Conway, August 1st
  Wow! Hope the video will be available....
• Commented on Modules in core: who cares?
  I do not know why people debate about it. what I care most about perl are Subroutine Signatures and Moo(se). If any version ship with it, I will upgrade it immediately. For now, I do not even have the motivation...
• Commented on The clearest way(s) to check if a List contains...
  totally agree! I do not know there is so many ways in perl to check if a elem exists in list. Thanks....
• Commented on The clearest way(s) to check if a List contains...
  $a ~~ @list should also work. search through a list the time is N, but check on hash is constant time. correct me if I am wrong. Thanks....

Comment Threads

• yanick.champoux commented on Watch the secret YAPC::NA live

  I understand the frustration, and I agree that the communication channels have been sub-optimal. No arguing there.

  However, I think we should also take a long, deep breath, and try to veer the discussion toward what can we do to improve the situation. For most (if not all) of the organizers, YAPC is a labor of love. And labor is the right word there -- it's a long, arduous, exhausting, unglorious process that end in a big final week-long push. Personally, I have no doubt that everybody involved honestly did gave their all. But life, and things, and then more life, happened. And as Ki…

• Ron Savage commented on Book Report - December 2014

  I'd say it's contrived to discuss objects before constructors. It sounds like you feel constructors need to be discussed in detail before object are mentioned, but perhaps you can introduce them (ctors) briefly, i. e. just enough to provide context for the discussion of objects, before returning to them.
  

• https://www.google.com/accounts/o8/id?id=AItOawmEFmsULh5l4dO4ek5K2NQ-8wcJG99nGOA commented on Book Report - December 2014

  Sid Burn:

  You didn't really need any module at all to explain classes. I would say, someone only has really understand object-orientation if he knew how to code OO in an imperative or functional style. And that is the most important thing. OO is not about shiny syntax and having "class, method, new" keywords and so on, it is about the idea of encapsulating data/state.

  For example an imperative way of describing a "Person-Class". At first you think about a datastructure which data/state it should hold. Well something simple, a person just have a name and an age field. And you …

• J commented on The clearest way(s) to check if a List contains...

  I was just thinking on this the other day. To answer your Hash question: Like another commenter said hash lookup time is constant. It's can be a better choice when you want to search the array multiple times.

  When I was thinking about this I did some benchmarks. Hopefully I've done them right. I tested arrays of 100 elements searching for an integer that was in the middle of the array. I've pasted the results below.

  The way I interpret it is that you'd need to do at least 7 lookups for a hash lookup to be a better choice than grep, and around 25 lookups before it outperforms…

• J commented on The clearest way(s) to check if a List contains...

  I forgot to mention that the reason why the lookup is slower on a single search in the first place is that I'm converting the array to a hash before doing the search. I'm using the "%hash = map { $_ => 1 } @array;" pattern you often see.