Sorting of array of hash

Question

I have an array of hash, sorting by particular key not properly working,

The array of hash is:

@final_array = [{:Region=>"region - 1", :ItemSize=>"Box", :Price=>""}, {:Region=>"region - 1", :ItemSize=>"Pack", :Price=>""}, {:Region=>"region - 1", :ItemSize=>"ball", :Price=>""}, {:Region=>"region - 1", :ItemSize=>"ball -1", :Price=>""}, {:Region=>"region - 1", :ItemSize=>"new size", :Price=>""}, {:Region=>"region - 1", :ItemSize=>"new size 1", :Price=>""}, {:Region=>"region - 1", :ItemSize=>"wels", :Price=>""}]

@final_array = @final_array.sort_by { |x, y| x[:ItemSize] }

After sorting I am checking array by select query.

a = []

@final_array.select{ |x, y| a << x[:ItemSize] }

a
# => ["Box", "Pack", "ball", "ball -1", "new size", "new size 1", "wels"]

It's not properly working.

How do I solve this problem?

What do you mean with not working properly? ["Box", "Pack", "ball", "ball -1", "new size", "new size 1", "wels"].sort == ["Box", "Pack", "ball", "ball -1", "new size", "new size 1", "wels"] # true — Sebastián Palma
– Sebastián Palma, Commented Apr 7, 2019 at 2:48
I mean after sorting by itemsize it's not coming properly. To show itemsize alone I am using select to filter the sorted key alone. — Bala
– Bala, Commented Apr 7, 2019 at 17:54
If u check the result the order should come in [ball, ball -1, Box , new size 1, pack wells], — Bala
– Bala, Commented Apr 7, 2019 at 17:56

Igbanam · Accepted Answer · 2019-04-08 14:12:27Z

1

@final_array = @final_array.sort_by { |x, y| x[:ItemSize].downcase }

This makes sure that the case you pass into sort_by is all the same. It does not change the case of the ItemSize values.

answered Apr 8, 2019 at 14:12

Igbanam

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arieljuod · Accepted Answer · 2019-04-07 18:21:09Z

0

If you compare 2 strings for sorting with just str1 <=> str2, upcase letters comes before downcase letter: A B C ... Y Z a b c ... y z. That's why you get Box and Pack before ball.

Turn everything to the same case if you want' it case insensitive.

@final_array.sort_by { |x, y| x[:ItemSize].downcase }

Anyway, I personally don't like sorting hashed, I would better get the values I need as an array and then order that array.

ordered = @final_array.map{|x| x[:ItemSize] }.sort_by{|x| x.downcase }

answered Apr 7, 2019 at 18:21

arieljuod

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1 Comment

Bala Over a year ago

Thanks arieljuod for brief explanation.

Rubioli · Accepted Answer · 2022-06-18 20:57:41Z

0

You can try in following way:

sorted_arr = @final_array.collect{|arr| arr[:ItemSize]}.sort { | a1, a2 | a1.downcase <=> a2.downcase }

edited Jun 18, 2022 at 20:57

Rubioli

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answered Apr 8, 2019 at 12:35

FullStackShri

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