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    • thomthomT Offline
      thomthom
      last edited by

      @adamb said:

      I see a lot of SU scripts using some of the more compact iterators Ruby iterators. So they might read nice, but they're often slower than just simple for-loops.

      shingara.fr

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      (blog.shingara.fr)

      Interesting. for is faster than each. But do ... end is faster than { ... } ? I really didn't expect that. And I don't see why. Thought it was just alternative syntax. But they behave differently?

      @adamb said:

      The other biggie to look out for is operations that involve copying when modifying in place would work just as well. Its slow and it generates lots of garbage.

      Interesting. I'll have to look through some of my code. I've not thought of that at all.

      Thomas Thomassen — SketchUp Monkey & Coding addict
      List of my plugins and link to the CookieWare fund

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      • thomthomT Offline
        thomthom
        last edited by

        @thomthom said:

        But do ... end is faster than { ... } ? I really didn't expect that. And I don't see why. Thought it was just alternative syntax. But they behave differently?

        hm.. maybe not. seemed to very very little difference. suppose that's other things affecting the minute differences.

        Thomas Thomassen — SketchUp Monkey & Coding addict
        List of my plugins and link to the CookieWare fund

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        • thomthomT Offline
          thomthom
          last edited by

          And why is for faster then each?

          Looking at the source code for Array.each:

          
          VALUE
          rb_ary_each(ary)
              VALUE ary;
          {
              long i;
          
              for (i=0; i<RARRAY(ary)->len; i++) {
                  rb_yield(RARRAY(ary)->ptr[i]);
              }
              return ary;
          }
          
          

          It's using for as well, and the whole loop is done in C - so why isn't this C for loop faster than a ruby for loop?

          Thomas Thomassen — SketchUp Monkey & Coding addict
          List of my plugins and link to the CookieWare fund

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          • AdamBA Offline
            AdamB
            last edited by

            OT: Any chance the forum administrator of SCF can fix the [ruby] tag to not remove formatting. Formatting is a big part of understanding code, and while for regular text collapsing whitespace down to a single space might work, for code it does not.

            Developer of LightUp Click for website

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            • thomthomT Offline
              thomthom
              last edited by

              @adamb said:

              OT: Any chance the forum administrator of SCF can fix the [ruby:38zsi59i]tag to not remove formatting. Formatting is a big part of understanding code, and while for regular text collapsing whitespace down to a single space might work, for code it does not.

              I think the ruby is meant for inline code. While you got the code tag for block codes. (Though I wish there was a way to expand it - I loathe internal scrollbars.)

              Thomas Thomassen — SketchUp Monkey & Coding addict
              List of my plugins and link to the CookieWare fund

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              • thomthomT Offline
                thomthom
                last edited by

                Interesting test Adam:

                doit 6.474 3.292 nil

                Note: I increased the number of iterations ( 10000000.times { ... })

                Thomas Thomassen — SketchUp Monkey & Coding addict
                List of my plugins and link to the CookieWare fund

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                • thomthomT Offline
                  thomthom
                  last edited by

                  Didn't realise Ruby would recreate the variables for each iteration. I'd thought it'd keep them for the duration of the loop...

                  Thomas Thomassen — SketchUp Monkey & Coding addict
                  List of my plugins and link to the CookieWare fund

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                  • AdamBA Offline
                    AdamB
                    last edited by

                    Seems an arbitrary (and wrong) assumption that inline code requires removing whitespace. Why not just leave in what the author wrote rather than trying to second guess? Whatever.

                    Developer of LightUp Click for website

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                    • thomthomT Offline
                      thomthom
                      last edited by

                      Agree - whitespace eating of ruby has bothered me as well. Will ask if it can be changed.

                      Thomas Thomassen — SketchUp Monkey & Coding addict
                      List of my plugins and link to the CookieWare fund

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                      • AdamBA Offline
                        AdamB
                        last edited by

                        @thomthom said:

                        Didn't realise Ruby would recreate the variables for each iteration. I'd thought it'd keep them for the duration of the loop...

                        The closure you create with curly braces is handled as a first class object and passed as an argument to the iterator. This means the scope of any variables you mention inside that block is limited to that block - it must create them each time. 😞

                        Developer of LightUp Click for website

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                        • thomthomT Offline
                          thomthom
                          last edited by

                          Is that why each is slow?

                          Thomas Thomassen — SketchUp Monkey & Coding addict
                          List of my plugins and link to the CookieWare fund

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                          • GaieusG Offline
                            Gaieus
                            last edited by

                            Guys, Thom asked if we can do something with these white spaces but I have to say it is most probable that we cannot. I is hard coded somewhere in the php script of the forum software and even if we could tweak that, it would be impossible to keep it through upgrades (which is very due soon anyway).

                            Is the code tag not good (apart from that scrolling annoyance)?

                            Gai...

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                            • thomthomT Offline
                              thomthom
                              last edited by

                              It's ok. I just hoped there was a config UI for BBCode tags on the forum. Thought it was normal. The code tag is ok, just figured if it could be changed...

                              I don't suppose there are forum plugins that can be installed? having the code block apply syntax highlighting would be a delight for us coders. Such as this:

                              http://code.google.com/p/syntaxhighlighter/

                              http://syntaxhighlighter.googlecode.com/files/Overview01.png

                              Edit: what version of phpBB does SCF run? I'm looking at this: http://www.phpbb.com/kb/article/adding-custom-bbcodes-in-phpbb3/ from this it appear to be that it'd be a matter of setting the HTML replacement for the ruby tag to not collapse white space using CSS.

                              Replacement sample something like this:
                              <span style="white-space:pre;">{TEXT}</span>

                              Thomas Thomassen — SketchUp Monkey & Coding addict
                              List of my plugins and link to the CookieWare fund

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                              • GaieusG Offline
                                Gaieus
                                last edited by

                                I can imagine you would like that syntax highlight! I use Notepad++ and know what a difference it is!

                                Coen and Tavi should be spoken to about these things.

                                Gai...

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                                • thomthomT Offline
                                  thomthom
                                  last edited by

                                  @adamb said:

                                  I see a lot of SU scripts using some of the more compact iterators Ruby iterators. So they might read nice, but they're often slower than just simple for-loops.

                                  shingara.fr

                                  This domain may be for sale!

                                  favicon

                                  (blog.shingara.fr)

                                  In regard to this should one init the variables used by for in to speed up things? or is that not needed?

                                  Would this
                                  ` x = 0
                                  for x in collection

                                  ...

                                  endbe faster than for x in collection

                                  ...

                                  end`

                                  Thomas Thomassen — SketchUp Monkey & Coding addict
                                  List of my plugins and link to the CookieWare fund

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                                  • AdamBA Offline
                                    AdamB
                                    last edited by

                                    no

                                    Developer of LightUp Click for website

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                                    • J Offline
                                      Jim
                                      last edited by

                                      I've always thought for used each under the hood.

                                      http://blog.grayproductions.net/articles/the_evils_of_the_for_loop

                                      for loops do not have their own scope - the loop variable and any variables created in the loop become available (or are over-written) in the current scope.

                                      With .each, variables are local to the block {..}

                                      Hi

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                                      • thomthomT Offline
                                        thomthom
                                        last edited by

                                        @jim said:

                                        I've always thought for used each under the hood.

                                        http://blog.grayproductions.net/articles/the_evils_of_the_for_loop

                                        for loops do not have their own scope - the loop variable and any variables created in the loop become available (or are over-written) in the current scope.

                                        If you click the method names in the Ruby API manual you get to see the sourcecode:
                                        http://ruby-doc.org/core/classes/Array.html#M002173

                                        Thomas Thomassen — SketchUp Monkey & Coding addict
                                        List of my plugins and link to the CookieWare fund

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                                        • J Offline
                                          Jim
                                          last edited by

                                          That's showing a for loop in the c language.

                                          Hi

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                                          • thomthomT Offline
                                            thomthom
                                            last edited by

                                            That's what it's doing under the hood.

                                            Thomas Thomassen — SketchUp Monkey & Coding addict
                                            List of my plugins and link to the CookieWare fund

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