I made these two functions to extend the default String object:

class String
	def rtrim(character)

		if self[-1, 1] == character.to_s
			self[0, self.length - 1]
		end
		return self
	end

	def ltrim(character)
		if self[0, 1] == character.to_s
			self[1, self.length]
		end
		return self
	end
end

Are they ok? I mean, aren't there any default Ruby functions I am
copying? I looked on google for functions that did the same as above
functions, but I couldn't find any for Ruby.

Thanks in advance!