CODEWITHSUNDEEP
ruby-on-railsarraysruby
bopritchard
bopritchard

Reputation: 399

Find values that each subarray of an array contains

I've got an Array of arrays. There can be two or more subarrays: 

array = [
  ["66892885", "66891801", "66924833", "66892255"],
  ["65167829", "65167828", "66924833"],
  ["66924833", "66891801"]
]

I need only the values found across each subarray. So in this case "66924833" would be the only match. For a value to show up in the result, each subarray has to contain it.

How can I do this?

Upvotes: 2

Views: 233

Answers (1)

Viktor
Viktor

Reputation: 2783

You can combine inject with Array's Set Intersection (#&) method like this

array.inject(:&)

to get the desired result:

array=[["66892885", "66891801", "66924833", "66892255", "1", "33"],
       ["65167829", "65167828", "66924833", "1", "33", "44"], 
       ["2344", "66924833", "1", "33"]]

array.inject(:&)
#=>["66924833", "1", "33"]

Upvotes: 3

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