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POsort an array of arrays based on number of occurences in ruby
 

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  1. POsort an array of arrays based on number of occurences in ruby
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    <p>I want this integer array to be sorted in the right order based on its number of occurrences.</p> <pre><code>question = [[1, 7, 8, 9, 10, 11, 12, 19, 20, 21, 31, 32, 34, 35, 36, 37, 38, 39, 40, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 81, 129, 132, 133, 134, 135, 136, 139], [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 31, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 81, 129, 130, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141], [30], [77]] question.flatten.uniq.size = 90 answer = sort_it(question) answer = [77, 68, 8, 9, 10, 11, 12, 19, 20, 21, 31, 139, 34, 35, 36, 37, 38, 39, 40, 42, 43, 44, 135, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 136, 66, 67, 7, 70, 71, 72, 73, 74, 75, 76, 1, 78, 79, 81, 129, 132, 133, 134, 45, 65, 32, 2, 3, 4, 5, 6, 13, 14, 15, 16, 17, 22, 23, 24, 25, 26, 27, 29, 33, 41, 69, 130, 137, 138, 140, 141, 30] answer.uniq.size = 90 </code></pre> <p>Here is my Ruby code:</p> <pre><code>def sort_it(actual) join=[] buffer = actual.dup final = [ ] (actual.size-2).downto(0) {|j| join.unshift(actual.map{|i| i }.inject(:"&amp;")) actual.pop } ordered_join = join.reverse.flatten final &lt;&lt; ordered_join final &lt;&lt; buffer.flatten - ordered_join final.flatten end </code></pre> <p>Is this approach OK? Is there a more efficient approach?</p> <h2>EDIT:</h2> <p><em>As a tribute to tokland and niklas, edited the answer which was in the wrong order before. Thanks!</em></p>
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    1. COWhat do you mean by "the right order based on its number of occurrences"? Can you say more explicitly what it is that you want the code to do?
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      1. USGareth McCaughan
    2. COJust out of curiosity, what's it for?
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      1. USGareth McCaughan
    3. COI don't get it. `question` is not an integer array?
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      1. POsort an array of arrays based on number of occurences in ruby
      1. USNiklas B.
 

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