How to get the Index of a specific item in Multidimensional (nested) Arrays?

Question

ary=[ [[0, 0], [0, 1], [0, 2]],
      [[0, 3], [0, 4], [0, 5]],
      [[0, 6], [0, 7], [0, 8]] ]

I am trying to find the index in the "main" array that contains an array with [0, 4] in it, which is 1.

I've been working with the idea like this:

ary.each_index.select{|index| #(return index if [0,4] matches) }

Ursus · Accepted Answer · 2016-09-05 08:17:39Z

6

Try

ary.find_index { |arr| arr.include?([0, 4]) }

edited Sep 5, 2016 at 8:17

answered Sep 5, 2016 at 7:42

Ursus

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1 Comment

Wolf_Tru Over a year ago

i can't believe i didn't think of this before haha

Community · Accepted Answer · 2017-05-23 12:16:18Z

0

Try to check the following.

Find indices of elements that match a given condition

Get index of array element faster than O(n)

http://apidock.com/ruby/Array/find_index

edited May 23, 2017 at 12:16

CommunityBot

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answered Sep 5, 2016 at 7:46

Steve Methner

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1 Comment

tadman Over a year ago

It's not really an answer if you don't demonstrate how it works. Link-only answers are considered low quality.

Santosh Sharma · Accepted Answer · 2016-09-05 11:59:39Z

0

Try Following.

ary.find_index { |arr| arr.index([0, 4]) }

answered Sep 5, 2016 at 11:59

Santosh Sharma

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