apple = ["a","p","p"]
zebra = ["a","p","p","l","e"]
apple & zebra
# returns => ["a", "p"]
I want a function that returns ["a","p","p"]
is there any method that can do this?
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jamekeit
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2already answered there : http://stackoverflow.com/questions/38020334/ruby-array-intersection-with-duplicates. Use `(apple & zebra).flat_map { |n| [n]*[apple.count(n), zebra.count(n)].min }` – Eric Duminil Dec 01 '16 at 21:54
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what is the intended result if one or the other has only 1 p? – engineersmnky Dec 01 '16 at 22:02
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This works for your example. No idea if it works generally as the rules aren't so clear to me `apple.select { |i| zebra.include? i }` – Sagar Pandya Dec 01 '16 at 22:07
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1@sagarpandya82 : This is wrong, for example with `app` and `aple`. – Eric Duminil Dec 01 '16 at 22:10
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@EricDuminil my fault, you were right – fl00r Dec 01 '16 at 22:10
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@fl00r The duplicate question has a faster implementation for big arrays. – Eric Duminil Dec 01 '16 at 22:11
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@engineersmnky: `intersection` makes it pretty clear. Only 1 p should be returned. – Eric Duminil Dec 01 '16 at 22:13
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The selected answer at the dup question looks quite good. – Cary Swoveland Dec 02 '16 at 00:02