using an enumerable built-in Ruby to access and manipulate nested data

Question

Is there a built-in which will easily allow you to access the objects within an array and its sub arrays so that one can achieve something along the lines of:

array = [5, 10, [15, 20], 25, [30, 35, 40]
array#method { #block that adds 5} => [10, 15, [20, 25], 30, [35, 40, 45]

I'm unconcerned if it is destructive or not.

mu is too short · Accepted Answer · 2015-04-13 22:15:07Z

3

You could use a recursive lambda:

add_five = lambda { |e| e.is_a?(Enumerable) ? e.map(&add_five) : e + 5 }
new_array = array.map(&add_five)

Adjust the e.is_a?(Enumerable) test to match your situation, e.is_a?(Array) would be tighter but possibly unnecessarily so.

answered Apr 13, 2015 at 22:15

mu is too short

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1 Comment

tadman Over a year ago

There's also the responds_to?(:map) approach where if it smells duck-like enough you may as well ask it to quack.

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