From: Ian Whitlock <iw1junk@...>
Date: 2007-07-26T08:39:55+09:00
Subject: Re: rtrim and ltrim function for ruby: is this ok?

Leon Bogaert wrote:
> This works. But I would rather see the first object changed. Is this
> possible?

I would argue that ltrim and rtrim should not remove one character, but
a sequence of the given character.  The following code probably does
not meet all ruby conventions, but it does what you request and it does
reserve ! for its intended purpose.

class String
  def rtrim!(character)
    n = 0
    while (self[-(n+1), 1] == character.to_s)
      n +=1
    end
    self.slice!(self.length - n,n) if n > 0
  end

  def ltrim!(character)
    n = 0
    while (self[n, 1] == character.to_s)
      n += 1
    end
    self.slice!(0 , n) if n > 0
  end
end

s = "aaaaaabacbccccc"
p s
s.rtrim!("c")
p s
s.ltrim!("b")
p s
s.ltrim!("a")
p s

Ian
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