Ruby - check if array of arrays contains some array [duplicate]

Question

I have an array of arrays, f.e: [[1,2],[3,4],[4,5]]. I want to check if this collection contains array [1,2]. Is there any way to do so without hardcoding it?

Zoran · Accepted Answer · 2017-10-26 22:37:28Z

4

Ruby's #include? method can be used here:

arr = [[1, 2], [3, 4], [4, 5]]
arr.include?([1, 2])
# => true

Hope this helps!

answered Oct 26, 2017 at 22:37

Zoran

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2 Comments

Rozek Over a year ago

Thanks, that solved my problem. For a long time I thought I had a problem with an array flattening, but apparently that was a bug in my own code,

Cary Swoveland Over a year ago

include? is more direct, but you could instead use arr.index([1,2]) (returns nil or a truthy value) or (arr & [1,2]).any? or arr - [1,2] != arr (etc.).

hyperneutrino · Accepted Answer · 2017-10-26 22:37:41Z

0

Just use bigarray.include? smallarray. It's the same way you'd check for membership with any other list. Example

answered Oct 26, 2017 at 22:37

hyperneutrino

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