CODEWITHSUNDEEP
rubyarrayssorting
Yogzzz
Yogzzz

Reputation: 2795

Sort array by values in a separate hash

I have a hash mapping array indices to sort values, e.g.

{0=>"item_ss", 1=>"item_hsj", 2=>"item_skls"}

I have a separate array with line_item_id and associated line_items (tab separated) as follows:

["item_skls \t sim1\t99\n", "item_ss \t sim2\t54\n", "item_hsj \t sim3\t48\n"]

How can I sort the array using the values of the hash as the identifier and the key as the index of for the array?

For example, I want the array above to be sorted as follows:

["item_ss \t sim2\t99\n", "item_hsj \t sim3\t54\n", "item_skls \t sim1\t48\n"]

Upvotes: 1

Views: 51

Answers (2)

Phrogz
Phrogz

Reputation: 303530

a = ["item_skls \t sim1\t99\n", "item_ss \t sim2\t54\n", "item_hsj \t sim3\t48\n"]
h = {0=>"item_ss", 1=>"item_hsj", 2=>"item_skls"}

puts a.sort_by.with_index{ |v,i| h[i] }
#=> item_ss      sim2   54
#=> item_hsj     sim3   48
#=> item_skls    sim1   99

Upvotes: 2

Arup Rakshit
Arup Rakshit

Reputation: 118299

I'd do

hash = {0=>"item_ss", 1=>"item_hsj", 2=>"item_skls"}
array = ["item_skls \t sim1\t99\n", "item_ss \t sim2\t54\n", "item_hsj \t sim3\t48\n"]
array.sort_by { |s| hash.find { |_,v| s.starts_with? v }.first }
# => ["item_ss \t sim2\t54\n",
#     "item_hsj \t sim3\t48\n",
#     "item_skls \t sim1\t99\n"]

Upvotes: 0

Related Questions