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Ruby Discussion Thread
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Dec 26th, 2007

My first Ruby programming question :-)

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Hello, I'm pleased to be here by way of the html forum. I've been using php for static pages for 18 months. I wanted to learn rails, but I just realized that I could configure my host to automate index.rhtml files just like php. This is a major motivator for me to learn Ruby, and after a few more months I can start fresh with Rails. OK, here is the code that works in PHP, and what I've got so far in Ruby. The JS effect can be viewed here: http://listenlight.net/13 ---

Ruby Syntax (Toggle Plain Text)
<?php
 
  $i = 0; $n = 0;
 
  $str = "listenlightpoetryjournal";
 
  while( $str[$i] != "" ) {
    echo("<span id=\"n".$n++."\" style=\"position:relative; visibility: hidden; font-size: normal; top:".(rand(-18, 18))."px; color: black;\">".$str[$i]."</span>");
 
    $i++;
  }
 
?>
<?php

  $i = 0; $n = 0;
  
  $str = "listenlightpoetryjournal";
  
  while( $str[$i] != "" ) {
    echo("<span id=\"n".$n++."\" style=\"position:relative; visibility: hidden; font-size: normal; top:".(rand(-18, 18))."px; color: black;\">".$str[$i]."</span>");
  
    $i++;
  }

?>

Ruby Syntax (Toggle Plain Text)
  <%   
  def banner
      str = "listenlightpoetryjournal"
      i, n = 0, 0
    until c = str[i] == nil 
        line = "<span id=\"n", n, "\" style=\"position: relative; font-size: normal; top:", rand(36) - 18, "px;\">", c, "</span>"
        i += 1
        n += 1 
        output = output, line
    end
  end
   %>
 
   <%= banner  %>
  <%   
  def banner
      str = "listenlightpoetryjournal"
      i, n = 0, 0
    until c = str[i] == nil 
        line = "<span id=\"n", n, "\" style=\"position: relative; font-size: normal; top:", rand(36) - 18, "px;\">", c, "</span>"
        i += 1
        n += 1 
        output = output, line
    end
  end
   %>
   
   <%= banner  %>

In the Ruby example, I've set the visibility attribute in the CSS, attempting to clean the markup. Also, is there a way to do a parallel incrementing?--such as a, b += 1, 1 (?)

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tefflox

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Dec 26th, 2007

Re: My first Ruby programming question :-)

My solution ---

Ruby Syntax (Toggle Plain Text)
  <%=
      def banner
        i, n, span, str = 0, 0, String.new, "listenlightpoetryjournal"
        until i == str.length do
          span << "<span id=\"n" << n.to_s << "\" style=\"top: " 
                << (rand(36) - 18).to_s << "px;\">" << str[i] << "</span>"
          i, n = i + 1, n + 1
        end 
        return span
      end
      banner
  %>
  <%=
      def banner
        i, n, span, str = 0, 0, String.new, "listenlightpoetryjournal"
        until i == str.length do
          span << "<span id=\"n" << n.to_s << "\" style=\"top: " 
                << (rand(36) - 18).to_s << "px;\">" << str[i] << "</span>"
          i, n = i + 1, n + 1
        end 
        return span
      end
      banner
  %>

No more PHP for this one.

tefflox

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since Jul 2006

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Dec 29th, 2007

Re: My first Ruby programming question :-)

Click to Expand / Collapse Quote originally posted by tefflox ...

My solution ---
Ruby Syntax (Toggle Plain Text)
  <%=
      def banner
        i, n, span, str = 0, 0, String.new, "listenlightpoetryjournal"
        until i == str.length do
          span << "<span id=\"n" << n.to_s << "\" style=\"top: " 
                << (rand(36) - 18).to_s << "px;\">" << str[i] << "</span>"
          i, n = i + 1, n + 1
        end 
        return span
      end
      banner
  %>
<%= def banner i, n, span, str = 0, 0, String.new, "listenlightpoetryjournal" until i == str.length do span << "<span id=\"n" << n.to_s << "\" style=\"top: " << (rand(36) - 18).to_s << "px;\">" << str[i] << "</span>" i, n = i + 1, n + 1 end return span end banner %>
No more PHP for this one.

Although your solution is fine it can be a little more readable (and re-usable) in rails.

In the controller:

ruby Syntax (Toggle Plain Text)
def banner(text)
	span = String.new
	text.split(//).each_with_index do |c, i| 
		span += "<span id='#{i}' style='top:#{(rand(36)-18)}px;'>#{c}</span>\n"
	end
	span
end
def banner(text)
	span = String.new
	text.split(//).each_with_index do |c, i| 
		span += "<span id='#{i}' style='top:#{(rand(36)-18)}px;'>#{c}</span>\n"
	end
	span
end

Then in the view

Ruby Syntax (Toggle Plain Text)
<%= banner("listenlightpoetryjournal") %>
<%= banner("listenlightpoetryjournal") %>

pty

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Jan 1st, 2008

Re: My first Ruby programming question :-)

pty's improvement is a good one!

The only nit I have with it is that I wouldn't put the banner method in the controller, since it has nothing to do with the "traffic cop" jobs that controllers normally do. I would put it in a helper file, either this controller's helper file or the application_helper.rb file (if it's a method you'd want to use in other controllers).

Ed

eruder

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since Jan 2005

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Jan 1st, 2008

Re: My first Ruby programming question :-)

thanks. i appreciate the direction on working with strings, but it's only for static pages. i'm not using the rails framework. i just wanted to make it concise.

tefflox

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Jan 2nd, 2008

Re: My first Ruby programming question :-)

Click to Expand / Collapse Quote originally posted by eruder ...

pty's improvement is a good one!

The only nit I have with it is that I wouldn't put the banner method in the controller, since it has nothing to do with the "traffic cop" jobs that controllers normally do. I would put it in a helper file, either this controller's helper file or the application_helper.rb file (if it's a method you'd want to use in other controllers).

Ed

Thanks Ed

pty

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