Array value comparison with a multidimension array ruby-CodePudding

If i have 2 arrays like let's say :

arr1 = [1,2,3,4,5,6]
arr2 = [[2,4],12]

i would like to return variable :

result=[1,3]

How can i create a variable that returns the indexes from arr1 that corresponds to the values from the arr2 nested array.

CodePudding user response：

First of all you would need to flatten your second multidimensional array, and afterwards just find that item index in the first one.

arr1 = [1,2,3,4,5,6]
arr2 = [[2,4],12]

def find_indexes(arr1, arr2)
  arr2.flatten.each_with_object([]) do |item, acc|
    index = arr1.index(item).to_i
    acc << index if index > 0
  end
end

find_indexes(arr1, arr2)
#=> [1,3]

CodePudding user response：

arr1 = [1,2,3,4,5,6]
arr2 = [[2,4],12]

arr2.flatten.each_with_object([]) { |num, arr| arr << arr1.index(num) }.compact.uniq
#=> [1, 3]