CODEWITHSUNDEEP
ruby-on-railsruby
Ramya
Ramya

Reputation: 107

Ruby Array conversion best way

What is the best way to achieve the following, I have following array of actions under ABC

ABC:-

ABC:Actions,
ABC:Actions:ADD-DATA,
ABC:Actions:TRANSFER-DATA,
ABC:Actions:EXPORT,
ABC:Actions:PRINT,
ABC:Detail,
ABC:Detail:OVERVIEW,
ABC:Detail:PRODUCT-DETAIL,
ABC:Detail:EVENT-LOG,
ABC:Detail:ORDERS

I want to format this as:

ABC =>{Actions=> [ADD-DATA,TRANSFER-DATA,EXPORT,PRINT], Detail => [Overview, Product-detail, event-log,orders]}

Upvotes: 0

Views: 125

Answers (3)

Shadwell
Shadwell

Reputation: 34774

There's probably a ton of ways to do it but here's one:

a = ["ABC:Actions",
"ABC:Actions:ADD-DATA",
"ABC:Actions:TRANSFER-DATA",
"ABC:Actions:EXPORT",
"ABC:Actions:PRINT",
"ABC:Detail",
"ABC:Detail:OVERVIEW",
"ABC:Detail:PRODUCT-DETAIL",
"ABC:Detail:EVENT-LOG",
"ABC:Detail:ORDERS"]

a.map { |action| action.split(":") }.inject({}) do |m, s|
  m[s.at(0)] ||= {}
  m[s.at(0)][s.at(1)] ||= [] if s.at(1)
  m[s.at(0)][s.at(1)] << s.at(2) if s.at(2)
  m
end

The map call returns an array where each of the strings in the original array have been split into an array of elements that were separated by :. For example [["ABC","Actions","ADD-DATA"] ... ]

The inject call then builds up a hash by going through each of these "split" arrays. It creates a mapping for the first element, if one doesn't already exist, to an empty hash, e.g. "ABC" => {}. Then it creates a mapping in that hash for the second element, if one doesn't already exist, to an empty array, e.g. "ABC" => { "Detail" => [] }. Then it adds the third element to that array to give something like "ABC" => { "Detail" => ["OVERVIEW"] }. Then it goes onto the next "split" array and adds that to the hash too in the same way.

Upvotes: 2

trushkevich
trushkevich

Reputation: 2677

It was just interesting to do it with group_by :)

a = ['ABC:Actions',
'ABC:Actions:ADD-DATA',
'ABC:Actions:TRANSFER-DATA',
'ABC:Actions:EXPORT',
'ABC:Actions:PRINT',
'ABC:Detail',
'ABC:Detail:OVERVIEW',
'ABC:Detail:PRODUCT-DETAIL',
'ABC:Detail:EVENT-LOG',
'ABC:Detail:ORDERS']

result = a.map { |action| action.split(":") }.group_by(&:shift)
result.each do |k1,v1|
  result[k1] = v1.group_by(&:shift)
  result[k1].each { |k2,v2| result[k1][k2] = v2.flatten }
end 

p result 

{"ABC"=>{"Actions"=>["ADD-DATA", "TRANSFER-DATA", "EXPORT", "PRINT"], "Detail"=>["OVERVIEW", "PRODUCT-DETAIL", "EVENT-LOG", "ORDERS"]}}

Upvotes: 1

Arup Rakshit
Arup Rakshit

Reputation: 118261

I will do this as below :

a = ["ABC:Actions",
"ABC:Actions:ADD-DATA",
"ABC:Actions:TRANSFER-DATA",
"ABC:Actions:EXPORT",
"ABC:Actions:PRINT",
"ABC:Detail",
"ABC:Detail:OVERVIEW",
"ABC:Detail:PRODUCT-DETAIL",
"ABC:Detail:EVENT-LOG",
"ABC:Detail:ORDERS"]

m = a.map{|i| i.split(":")[1..-1]}
# => [["Actions"],
#     ["Actions", "ADD-DATA"],
#     ["Actions", "TRANSFER-DATA"],
#     ["Actions", "EXPORT"],
#     ["Actions", "PRINT"],
#     ["Detail"],
#     ["Detail", "OVERVIEW"],
#     ["Detail", "PRODUCT-DETAIL"],
#     ["Detail", "EVENT-LOG"],
#     ["Detail", "ORDERS"]]

m.each_with_object(Hash.new([])){|(i,j),ob| ob[i] = ob[i] + [j] unless j.nil? }
# => {"Actions"=>["ADD-DATA", "TRANSFER-DATA", "EXPORT", "PRINT"],
#     "Detail"=>["OVERVIEW", "PRODUCT-DETAIL", "EVENT-LOG", "ORDERS"]}

Upvotes: 1

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