How to check for a certain value within an array WITHIN a hash?

Question

I have a hash which holds a series of arrays with values in them:

av_hash = {9 => [2,4,6], 10 => [5,7], 11 => [2,3,7]}

how can I check for the presence of a certain number in the array value of a certain hash key?

So if I wanted for example to find out if key 11 contains the number 2 in its array, what's the best way to go about this?

Get the array at the key and check it? I'm not sure what the issue actually is. — Dave Newton
– Dave Newton, Commented Feb 29, 2016 at 15:30

Simone Carletti · Accepted Answer · 2016-02-29 15:51:22Z

2

It's super straightforward. Get the item with given key using hash[key_name], then use Enumerable#include? to check if the array contains the element you want to find.

edited Feb 29, 2016 at 15:51

answered Feb 29, 2016 at 15:31

Simone Carletti

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2 Comments

S Craig Over a year ago

thanks, I couldn't work out if include? could be used with arrays within hashes. Will accept when I can

Stefan Over a year ago

That should be Array#include?

DiegoSalazar · Accepted Answer · 2016-02-29 15:58:39Z

You can either test the specific key you want or iterate over each key/val pair and return the key that includes the number you're looking for:

av_hash = {9 => [2,4,6], 10 => [5,7], 11 => [2,3,7]} search_for = 2 # see if specific key has `search_for` value in it: av_hash[11].includes? search_for # returns true if key 11's array includes 2 # get keys that contain the value: av_hash.map { |k, v| k if v.include? search_for }.compact # returns [9, 11]

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