# lecam - list existing classes and methods
#
def lecam
  cs = []
  ObjectSpace.each_object(Class) {|c| cs << c }
  cs = cs.sort_by { |c| c.to_s }

  cs.each do |c|
    puts "\n#{c}"
    c.methods(         false).sort.each {|m| puts "  c  #{m}" }
    c.instance_methods(false).sort.each {|m| puts "  i  #{m}" }
  end
end

Running lecam produces output of the form:

>> lecam; nil
...
Array
  c  []
  i  &
  i  *
...