Read-only Detection in Ruby for Java Developers

gistfile1.rb

class File
  def self.read_only?(file)
    s = File.stat(file)
    mode = sprintf("%o", s.mode)
    if s.owned?
      return true if mode[3].to_i == 4
    end

    if s.grpowned?
      return true if mode[4].to_i == 4
    end

    return true if mode[5].to_i == 4
    return false
  end
end

refactored_troll.rb

class File
  def self.read_only?(file)
    s = File.stat(file)
    mode = sprintf("%o", s.mode)

    return true if s.owned? and mode[3] == ?4
    return true if s.grpowned? and mode[4] == ?4

    mode[5] == ?4
  end
end