class String
def rotate_left(n=1)
n=1 unless n.kind_of? Integer
n.times do
char = self.shift
self.push(char)
end
self
end
def push(other)
newself = self + other.to_s.dup.shift.to_s
self.replace(newself)
end
def shift
return nil if self.empty?
item=self[0]
self.sub!(/^./,"")
return nil if item.nil?
item.chr
end
end
a = "this is a test"
puts a.rotate_left