在Ruby on Rails中排序數組

arr = [ 
    [0, "Moving Companies", 10], 
    [0, "ab-thera-sensa", 5], 
    [0, "belt-center", 16], 
    [0, "isabel", 3], 
    [0, "kreatio", 2], 
    [0, "service1", 7], 
    [0, "sorbion-sachet-multi-star", 6], 
    [0, "sss", 15], 
    [0, "telecom-service-industry", 14], 
    [1, " AbsoPad", 13], 
    [1, "telecom-service", 8], 
    [2, "cutisorb-ultra", 12], 
    [2, "sorbion-contact", 11], 
    [2, "sorbion-sachet-multi-star", 9] 
]

假設這是我的數組，現在我想按照第一個元素的降序對它進行排序。我可以做一個arr.sort.reverse但現在的問題開始在Ruby on Rails中排序數組

我得到的數組：

[ 
    [2, "sorbion-sachet-multi-star", 9], 
    [2, "sorbion-contact", 11], 
    [2, "cutisorb-ultra", 12], 
    [1, "telecom-service", 8], 
    [1, " AbsoPad", 13], 
    [0, "telecom-service-industry", 14], 
    [0, "sss", 15], [0, "sorbion-sachet-multi-star", 6], 
    [0, "service1", 7], 
    [0, "kreatio", 2], 
    [0, "isabel", 3], 
    [0, "belt-center", 16], 
    [0, "ab-thera-sensa", 5], 
    [0, "Moving Companies", 10] 
]

現在數組應該按升序排列的第二個元素的基礎上進行排序。

這怎麼能實現？

結果應該是這樣的：

[ 
    [2, "cutisorb-ultra", 12], 
    [2, "sorbion-contact", 11], 
    [2, "sorbion-sachet-multi-star", 9], 
    [1,.......] 
]

來源

2014-03-12 aelor

自定義與塊的排序。首先按第一個元素（0）進行降序排序。如果它們相同，則按第二個元素（1）升序排列：

arr.sort! do |a, b| 
    result = b[0] <=> a[0] 
    result = a[1] <=> b[1] if result == 0 
    result 
end

來源

2014-03-12 14:18:25

你是正確的+1。這個編輯對我來說很重要，因爲OP在尋找什麼。 –

謝謝，你能解釋一下你在那裏做了什麼。 – aelor

這樣怎麼樣？

arr.sort { |i,j| [j[0],j[2]] <=> [i[0],i[2]] }

輸出：

=> [[2, "cutisorb-ultra", 12], 
[2, "sorbion-contact", 11], 
[2, "sorbion-sachet-multi-star", 9], 
[1, " AbsoPad", 13], 
[1, "telecom-service", 8], 
[0, "belt-center", 16], 
[0, "sss", 15], 
[0, "telecom-service-industry", 14], 
[0, "Moving Companies", 10], 
[0, "service1", 7], 
[0, "sorbion-sachet-multi-star", 6], 
[0, "ab-thera-sensa", 5], 
[0, "isabel", 3], 
[0, "kreatio", 2]]

來源

2014-03-12 14:42:52 Abdo

誰告訴壞.. meee ??? +1 :-) –

-1

請嘗試：

arr.sort_by{|x|[-x[0],-x[2]]}

來源

2014-06-04 07:13:33 bluexuemei

你能解釋它爲什麼以及它是如何工作的嗎？ – Pietu1998

你能解釋一下嗎？ – aelor

在Ruby on Rails中排序數組

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