class String
def rotate_right(n=1)
n=1 unless n.kind_of? Integer
n.times do
char = self.pop
self.unshift(char)
end
self
end
def pop
return nil if self.empty?
item=self[-1]
self.chop!
return nil if item.nil?
item.chr
end
def unshift(other)
newself = other.to_s.dup.pop.to_s + self
self.replace(newself)
end
end
a = "this is a test"
puts a.rotate_right