Optimize #succ for skipping steps

succ_n.rb

# The idea here is that #succ could take an optional parameter
# to help optimize certain (albeit rare) cases when skipping steps
# is required.

class Fixnum

  # Allows #succ to take _n_ increments.
  #
  #   3.succ(2)  #=> 5
  #
  # CREDIT: Trans

  def succ(n=1)
    self + n
  end

  # Provides #pred as the opposite of #succ.
  #
  #   3.pred(2)  #=> 1
  #
  # CREDIT: Trans

  def pred(n=1)
    self - n
  end

end

class String

  alias_method :succ1, :succ

  # Allows #succ to take _n_ step increments.
  #
  #   "abc".succ      #=> "abd"
  #   "abc".succ(4)   #=> "abg"
  #   "abc".succ(24)  #=> "aca"
  #
  # TODO: Optimize String#succ(n) algorithm.
  #
  # CREDIT: Trans

  def succ(n=1)
    s = self
    n.times { s = s.succ1 }
    s
  end

end