Map array of ints to nested array access

Question

Is there a way to dynamically access a nested array using indices which are themselves stored in an array?

The main array/matrix nesting could be variable e.g. 2, 4, 100.

Example:

my_array = [
  [[1,  2], [3,   4]],
  [[5,  6], [7,   8]],
  [[9, 10], [11, 12]]
]

my_array.access_using_array([0, 1, 1])
  => 4

sawa · Accepted Answer · 2013-02-27 19:59:06Z

7

[0, 1, 1].inject(my_array, :fetch)
# => 4

answered Feb 27, 2013 at 19:59

sawa

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Comments

user513951 · Accepted Answer · 2016-01-06 03:22:42Z

1

Ruby 2.3.0 introduced a new method called dig on both Hash and Array that solves this problem.

It returns nil if an element is missing at any level of nesting.

my_array.dig(0,1,1)

answered Jan 6, 2016 at 3:22

user513951

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