class String
  def decapitalize
    self[0, 1].downcase + self[1..-1]
  end

  def to_class
    Object.const_get(self)
  end

  def to_bool
    return true if self == true || self =~ (/(true|t|yes|y|1|on)$/i)
    return false if self == false || self.empty? || self =~ (/(false|f|no|n|0|off)$/i)
    raise ArgumentError.new("invalid value for Boolean: \"#{self}\"")
  end
end