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How to detect which elements in an array have duplicates

Greetings folks! Lets say I have an array which has duplicates of some elements (This is intentional). How might I go about reporting which of those elements do occur more than once in the array?

Example: Lets say I have an array with the following strings as elements:

  • [Cat]

  • [Dog]

  • [Cat]

  • [Fish]

Then, in blueprint, I compare that array to the input [Cat], and desire an output of 'True' (or alternatively an integer of the # of occurrences would be fine too). Using the input of [Dog] should yield the output 'False' (or integer 1).

Anyone know how I could achieve this?

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asked Mar 14 '16 at 04:33 AM in Blueprint Scripting

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2 answers: sort voted first

Can´t you achive the exact thing you are asking for by a simple counter? If the counter is 1 then there are no duplicates. (false) 2 or more would imply duplicates. (true) 0 is of course not found in array. (error message?)

I guess you would want to reset counter to 0 at starting the function.

Counter solution?

counter.png (149.3 kB)
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answered Mar 14 '16 at 01:00 PM

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avatar image hypersapien Mar 14 '16 at 08:15 PM

Thanks for your suggestion. I considered having an INT that would count upward as it found matches, but I couldn't visualize what that network would look like. I just happened to figure out the other method first so I went with that.

I've never seen that CompareInt node before, so I'll file that away for future use =) Thanks for your help.

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Well I came up with a solution that accomplishes this, but it's messy. If anyone knows an easier way I'd love to hear it.

alt text

Arrays in this image:

  • [Potential Doorway List] Contains all of the elements I'm interested in searching, including duplicates

  • [Potential Doorways Checker] Starts out blank, then becomes a duplicate array of the previous one, except the element which is currently the focus of our loop has been removed.

  • [Positions for Door BP] the preceding branch should add any duplicate elements it finds to this array, as my final list of all duplicates found.

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answered Mar 14 '16 at 07:21 AM

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