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# Untitled

a guest Jan 24th, 2019 69 Never
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1. ary = [[1, 6, 7], [1, 4, 9], [1, 8, 3]]
2.
3. ary2 = ary.sort_by { |a, b, c| b.odd? ? b : c }
4.
5. arr2 = ary.sort_by { |a, b, c| a.odd? ? a : b.odd? ? b : c }
6.
7. ary2 = ary.sort_by do |a, b, c|
8.   if a.odd?
9.     a
10.   elsif b.odd?
11.     b
12.   else
13.     c
14.   end
15. end
16.
17. arr2 = arr.sort_by do |a, b, c|
18.   if a.odd?
19.     if b.odd?
20.       if c.odd?
21.         [a, b, c]
22.       else
23.         [a, b]
24.       end
25.     elsif c.odd?
26.       [a, c]
27.     else
28.       a
29.     end
30.   elsif b.odd?
31.     if c.odd?
32.       [b, c]
33.     else
34.       b
35.     end
36.   else
37.     c
38.   end
39. end
40.
41. arr2 = arr.sort_by do |sub_arr|
42.   temp = sub_arr.select do |e|
43.     e.odd?
44.   end
45.   temp.empty? ? Array(sub_arr.last) : temp
46. end
47.
48. def my_sort(arr)
49.   arr.sort_by {|a| a.any?(&:odd?) ? a.map {|e| e.odd? ? e : Float::INFINITY} : [a.last]}
50. end
51.
52. my_sort [[1, 6, 7], [1, 4, 9], [1, 2, 3]]
53.   #=>   [[1, ∞, 7], [1, ∞, 9], [1, ∞, 3]] (sort_by)
54.   #=>   [[1, 2, 3], [1, 6, 7], [1, 4, 9]]
55. my_sort [[3, 6, 7], [4, 1, 9], [5, 8, 1]]
56.   #=>   [[3, ∞, 7], [∞, 1, 9], [5, ∞, 1]] (sort_by)
57.   #=>   [[3, 6, 7], [5, 8, 1], [4, 1, 9]]
58. my_sort [[2, 6, 8], [4, 1, 4], [8, 6, 2]]
59.   #=>   [[8],       [∞, 1, ∞], [2]]       (sort_by)
60.   #=>   [[8, 6, 2], [2, 6, 8], [4, 1, 4]]
61. my_sort [[8, 6, 2], [5, 1, 1], [6, 8, 4]]
62.   #=>   [[2],       [5, 1, 1], [4]        (sort_by)
63.   #=>   [[8, 6, 2], [6, 8, 4], [5, 1, 1]]
64.
65. ary.sort_by{|a| a.select(&:odd?) | [a.last]}
66. # => [[1, 8, 3], [1, 6, 7], [1, 4, 9]]
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