Halloween Kata Solutions

Here are my solutions to the Halloween Kata using Eclipse Collections APIs.

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Top Candy

For the solutions, I used flatCollect, toBag, topOccurrences, collect, toSet, reduce and intersect.

APIs covered in Kata

  1. flatCollect — flattens a nested collection of collections based on some attribute specified in a Function.
  2. toBag — converts a collection to a Bag.
  3. topOccurrences — find the top occurrences of items in a Bag based on their counts. The List returned will be bigger than the specified count requested if there are any ties.
  4. collect — transforms a collection from one type to another using a specified Function.
  5. toSet — converts a collection to a Set.
  6. reduce — applies a BinaryOperator to all elements of the collection, in this case a call to intersect two sets.
  7. intersect — returns the result of intersecting two sets.

Eclipse Collections is open for contributions. If you like the library, you can let us know by starring it on GitHub.

Written by

Java Champion. Creator of the Eclipse Collections OSS Java library (http://www.eclipse.org/collections/). Inspired by Smalltalk. Opinions are my own.

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