Unlimited Ruby Range Behavior
Can someone clarify why the following happens?
irb(main):001:0> r = '1'..'30' => "1".."30" irb(main):002:0> r.each do |i| irb(main):003:1* puts "#{i} : #{r.include?(i)}" irb(main):004:1> end 1 : true 2 : true 3 : true 4 : false 5 : false 6 : false 7 : false 8 : false 9 : false 10 : true ... (snip.. the String-numbers here evaluate to true) ... 29 : true 30 : true => "1".."30" I would expect everything above to be true s. If I do the following:
irb(main):005:0> r.to_a.each do |i| irb(main):006:1* puts "#{i} : #{r.to_a.include?(i)}" irb(main):007:1> end 1 : true 2 : true ... (snip.. the String-numbers here evaluate to true) ... 29 : true 30 : true => ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", " 15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28 ", "29", "30"] then I get what I expected. Am I missing something because of how ranges work, or could it be a mistake (maybe the first one)? My bad advance if this is a question about noob. Hard / soft quoting doesn't matter, and the same problem occurs with ranges of numbers in String-form for values other than 1 to 30.
This is a quirk how ranges work in Ruby. Objects are generated by calling succ again, but membership is determined by x >= r.start && x <= r.end . Strings in Ruby do not have special behavior for ordering numbers - "4" is greater than "10" because "4" is greater than "1". Thus, any one-digit numbers that exceed the first digit of the final value will be displayed out of range.