From: "Jan E." <lists@...>
Date: 2012-04-11T13:22:45+09:00
Subject: Re: less absolutely horrible way to make sure array 1 only contains elements from array 2?

Hi,

I would simply check the choice *before* pushing it into @choices:

####
UserError = Class.new StandardError

@selections = []
begin
  invalid_choices = []
  print "Make selections: "
  myselections = gets.chop.split " "
  myselections.each do |path|
    if choices.include? path  # I don't see any problems with include?
      @selections.push path
    else
      invalid_choices.push path
    end
  end
  raise UserError if @selections.empty?
rescue UserError
  puts 'No valid selections.'
  retry
else
  unless invalid_choices.empty?
    puts "The following selections were invalid: #{invalid_choices.join 
', '}"
  end
end
####

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