302_control flow.txt

#  if then example

if result == "y"
  puts "you said 'y'"
else
  puts "you said something other than 'y'"
end



#  if break example

if true
  puts "this won't be run"
end





# case switch advanced example  http://ilikestuffblog.com/2008/04/15/how-to-write-case-switch-statements-in-ruby/


# Basically if/elsif/else (notice there's nothing
# after the word "case"):

[variable = ] case
  when do_Func_Resulting_In_bool_condition
    statements
  when do_Func_Resulting_In_bool_condition2
    statements
  else # the else clause is optional
    statements
end


#live example ########################################

var1 = case
  when true
    "hi"         # loop exits here
  when true
    "Replaced!"  # only one line gets run
end

# var1 now equals "hi"!








# case switch basic ###############################


case "hi"
  when "yo"
    puts "you said yo"
  when "hi"
    puts "you said 'hi'"
  else
    puts "I don't know what you said"
end






# This important snippent demonstrates how clean you can make cases by using procs...


divisible_by_nine = ->(i){ i % 9 == 0 }
divisible_by_seven = ->(i){ i % 7 == 0 }
divisible_by_three = ->(i){ i % 3 == 0 }
 
1.upto(50) do |number|
  print number
  case number
  when divisible_by_nine
    print " is divisible by nine!"
  when divisible_by_seven
    print " is divisible by seven!"
  when divisible_by_three
    print " is divisible by three!"
  end
  print "\n"
end
 
# versus..
 
1.upto(50) do |number|
  print number
  if divisible_by_nine[number]
    print " is divisible by nine!"
  elsif divisible_by_seven[number]
    print " is divisible by seven!"
  elsif divisible_by_three[number]
    print " is divisible by three!"
  end
  print "\n"
end








      use_current_rsa_files = "y"
      
      while true
        case use_current_rsa_files
          when "y"
            use_current_rsa_files_for_this_user()
            break
          when "n"
            create_new_rsa_key()
            true
          else
            puts "plz answer 'y' or 'n'"
            next
          end
      end