Sort array in Ruby on Rails

Question

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]
]

Suppose this is my array, now I want to sort it on the basis of the first element in descending order. I can do a arr.sort.reverse but the problem starts now

I get the array as :

[
    [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]
]

Now the array should be sorted on the basis of the second element in ascending order.

How can that be achieved?

The result should look like :

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

Rômulo Ceccon · Accepted Answer · 2014-03-12 14:18:25Z

2

Customize the sorting with a block. First do a descending sort by the first element (0). If they are equal do instead an ascending sort by the second element (1):

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

answered Mar 12, 2014 at 14:18

Rômulo Ceccon

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1 Comment

Arup Rakshit Over a year ago

You are correct +1. The edit makes sense to me what OP is looking for.

Abdo · Accepted Answer · 2014-03-12 14:42:52Z

0

How about this?

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

Outputs:

=> [[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]]

answered Mar 12, 2014 at 14:42

Abdo

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Comments

bluexuemei · Accepted Answer · 2014-06-04 07:13:33Z

-1

please try:

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

answered Jun 4, 2014 at 7:13

bluexuemei

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1 Comment

aelor Over a year ago

can you please explain this

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