Thoughts Unlimited

Propagating thoughts…

1. James Imessak 9.8.07 / 3am

   Hmm…. I was under the impression that strip was intended to remove characters from the beginning and the end of a string, not from the center:

   ” hello world “.strip #=> “hello world”

   with the space in-tact. I think “gsub” was the method you were looking for:

   “Hello World”.gsub(“o”, “”)

   or the like. Here’s a quick snippet to do a strip with a custom character… I just cooked it up real quick, without any testing, so there’s probably some condition I didn’t fix it up for…

   class String
   alias_method :strip_old, :strip
   def strip(char=nil)
   return strip_old if char == nil
   new_str = “”
   buff = “”
   state = :start
   self.each_byte do |byte|
   state = :middle if state == :start and byte.chr != char

   if state == :middle and byte.chr == char
   buff < 0
   new_str += buff
   buff = “”
   end

   new_str << byte.chr
   end
   end

   new_str
   end
   end
2. TB 9.12.07 / 9pm

   James is right about the strip (trim front and back spaces of a string). gsub method is used to replace a substring with another substring.

   However, James, I am not sure whether you forget to assign a value in buff variable in your iteration because buff is always an empty string. Does the buff variable automatically take the value from comparing byte.char?

   Please correct me if I am wrong. I am very new to Ruby.

   TB
3. James Imessak 9.24.07 / 10pm

   Hey TB. Sorry to confuse anyone, but I didn’t format the code correctly, so a whole load of characters apparently got stripped out.

   Let me try this again:
   
class String
alias_method :strip_old, :strip
def strip(char=nil)
return strip_old if char == nil
new_str = ""
buff = ""
state = :start
self.each_byte do |byte|
state = :middle if state == :start and byte.chr != char

   if state == :middle and byte.chr == char
   buff < 0
   new_str += buff
   buff = ""
   end

   new_str << byte.chr
   end
   end

   new_str
end
end


   Hope that works,
   James
4. mac 9.25.07 / 6am

   So just what is wrong with gsub? Not quite sure I get what you are trying here.

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