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beatTheDevil
beatTheDevil
Last Activity: Sep 8 '08, 06:19 AM
Joined: Nov 17 '06
Location: Seattle
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  • beatTheDevil
    started a topic Metaprogramming in Ruby: class_eval vs. instance_eval
    in Ruby

    Metaprogramming in Ruby: class_eval vs. instance_eval

    I'm using Ruby 1.8.6 btw.

    For the longest time today (it seems) I've been trying to understand exactly the operating difference between class_eval and instance_eval. There are some obvious differences I'm perfectly aware of (e.g. class_eval is only on Class objects), but the reality is that some irb tinkering has left me more confused than ever. Given the following:

    Code:
    class Foo
  # could be any class
    ...
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    • beatTheDevil
      started a topic Ruby and object references / copying
      in Ruby

      Ruby and object references / copying

      Hey guys,

      I had a theoretical question about Ruby's object handling. Not that it really matters, but I'm using Ruby 1.8.6.

      In Ruby, every variable holds a reference to an object. For instance, if you were to say:

      [code=ruby]
      myVar1 = []
      myVar2 = myVar1
      myVar2 << "giggity giggity goo"

      myVar[0] # => "giggity giggity goo"
      [/code...
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      Last edited by beatTheDevil; Sep 21 '07, 05:48 AM. Reason: ...forgot to finish a sentence
      • beatTheDevil
        replied to Late binding / dynamic dispatch: using a function not yet defined
        in Javascript
        I apologize. I'm an idiot. I had a typo in my sample file. Misaw is right; this does, in fact work. However, you don't need the (typeof ___ == "function") . Simply conditionalizin g on undefined works just fine.
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        • beatTheDevil
          replied to Late binding / dynamic dispatch: using a function not yet defined
          in Javascript
          This doesn't work. The problem is that, at the time of parsing, the JavaScript interpreter can find no definition of "myLateFunction " and so this test is never even considered. Try it. Just make an HTML file out of this and see what happens...

          [CODE=html]<script type="text/javascript">
          function earlyFunction() {
          if(typeof lateFunction != 'undefined' && typeof lateFunction == 'function')...
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          • beatTheDevil
            replied to When to use if vs else if
            in Javascript
            The bottom line is this:

            Use if statements if you want every condition tested. Theoretically, every if-wrapped code block could be executed if its conditional expression evaluated to "true."

            Use if/else statements when you want only one of a number of possibilities to be executed under a particular set of circumstances.
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            • beatTheDevil
              replied to Help on how to insert an alert inside window.location
              in Javascript
              So you have a Java program that you want to output trace/debugging information in JavaScript? Where is this Java program running? Is it an applet or are you running a full-fledged Java application?

              Either way you'll find that outputting to standard out (the console, in Java "System.out.pri ntln()") is not a very good way to get JavaScript interpreted.

              If you can state more clearly what it is that you are trying...
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              • beatTheDevil
                replied to Using a variable in JS replace method
                in Javascript
                JavaScript strings are immutable : ) (they can never be changed once constructed)...
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                • beatTheDevil
                  started a topic Late binding / dynamic dispatch: using a function not yet defined
                  in Javascript

                  Late binding / dynamic dispatch: using a function not yet defined

                  I searched, I swear. All my keywords were ignored by the search engine. Or I may just suck at searching with the right keywords, but I've been unable to find information about this. Perhaps somebody can elaborate.

                  I would to like to create a function, included in the header of an HTML page, which calls functions which are defined later, in <script /> tags farther down in the body of the page (I understand this is a terrible idea,...
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                  • beatTheDevil
                    replied to Ruby regex for removing C/Java-style /* ... */ comments
                    in Ruby
                    More specifically, even though it works fine on one-line strings, I think I've found that it's unable to match this style of comments across new lines ("\n"). Is there a way to get around this? I thought the '.' matched any character whatsoever...
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                    • beatTheDevil
                      replied to Nuby to Ruby (and all programming)
                      in Ruby
                      Have you looked at Why's Poignant Guide to Ruby? For most experienced programmers it's just frustratingly simple, but if you've truly never programmed before, it might be a better place to start than the Pickaxe. It's geared for beginners.

                      The full text is freely available here:

                      http://poignantguide.net/ruby/...
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                      • beatTheDevil
                        started a topic Ruby regex for removing C/Java-style /* ... */ comments
                        in Ruby

                        Ruby regex for removing C/Java-style /* ... */ comments

                        Hey guys,

                        As the title says I'm trying to make a regular expression (regex/regexp) for use in removing the comments from code. In this case, this particular regex is meant to match /* ... */ comments.

                        I'm using Ruby v.1.8.6

                        Here's my regex:
                        Code:
                        multiline_comments = /\/\*(.*?)\*\//
                        When I try
                        Code:
                        myStr.gsub(multiline_comments, "")
                        I see no effect. The string has big fat comments...
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                        • beatTheDevil
                          replied to CSS with firefox
                          in HTML CSS
                          If you're going to be spending much time with this, there is a single tool that will make your life much much easier.

                          https://addons.mozilla. org/en-US/firefox/addon/1843

                          Firebug is the best Firefox add-on I've worked with (I've found it to work much better than the Web Developer Toolbar for most things). It allows you to inspect every element in your document, observe its inherited CSS styles, its computed styles, modify...
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                          • beatTheDevil
                            replied to Eclipse Question Mac and PC
                            in Java
                            Sandy, your problem may have something to do with the fact that Apple, being somewhat stubborn and stingy with the implementation details of their operating system, doesn't allow Sun to write Java for the Mac. They write their own version and install it on their computers.

                            At the moment, only Java 1.5.x is available for Mac users. It looks like you need to upgrade from 1.4.2, so go to Apple's website, not Sun's or Eclipse's, and search...
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                            • beatTheDevil
                              replied to Data Strucutre for non-unique key-value pairs
                              in Java
                              Well of course you could hack it and use a Map as Jos suggested. Simply encapsulate your multiple values into a single Object of some kind (a List, Set, Array, etc.) and store that as your value. Makes your life a bit more difficult, but you could get it to work easily enough. To be super-clear, your mappings would take the form:

                              <key, List(value 1, value 2, ..., value n)>

                              Making your own data structure is only...
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                              • beatTheDevil
                                started a topic Behavior of C++ input streams at the end of the stream
                                in C

                                Behavior of C++ input streams at the end of the stream

                                Hello all,

                                I have a question that concerns how C++ input streams (istream, ifstream, istringstream, etc.) behave using the extraction (>>) operator when at the end of a stream's contents.

                                For instance, I have an input file which is just a one-line string: "do_stuff 20060101 " (yes, that is a trailing space)

                                I'm using a parse function that attempts to extract a string ("do_stuff")...
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                                • beatTheDevil
                                  started a topic Invoking a copy ctor semi-explicitly
                                  in C

                                  Invoking a copy ctor semi-explicitly

                                  First off, I'm not a complete idiot, so by "explicitly " I don't mean like this:

                                  MyClass imAnIdiot.MyCla ss(params);

                                  Here's what I'm getting at. If you have written a copy constructor for a class, is it legal to invoke this constructor in a "new" statement as follows?

                                  MyClass oldObject(param 1, param2);
                                  MyClass* newObject = new MyClass(oldObje ct);

                                  I can't imagine...
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