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Java

Daniel Silva
Daniel Silva
11,209 Points
Posted by Daniel Silva
Daniel Silva
11,209 Points

For this challenge you will modify the method Main.getWordCountFromGameTitlesDeclaratively to to produce a word count of

I'm having trouble solving the following code challenge.

For this challenge you will modify the method Main.getWordCountFromGameTitlesDeclaratively to to produce a word count of all games in the system. You will need to use a flatMap because there will be a stream of streams!

public static Map<String,Long> getWordCountFromGameTitlesDeclaratively(List<Score> scores) {
    // TODO: Open a stream on scores
    // TODO: Map the stream to the game title
    // TODO: Map that to it's lowercase version, so things are case insensitive
    // TODO: Map that to a new String array of each word in the title (See imperative implementation)
    // TODO: Flatten those words into the stream
    // TODO: Collect a grouping of the word to count
    return scores.stream()
      .map(Score::getGame)
      .map(title -> title.split("\\W+"))
      .flatMap(scores -> Stream.of(scores))
      .collect(Collectors.groupingBy(
        Function.identity(),
        Collectors.counting()
      ));
  }

1 Answer

Tonnie Fanadez
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Tonnie Fanadez
UX Design Techdegree Graduate 22,796 Points
Tonnie Fanadez
.a{fill-rule:evenodd;}techdegree seal-36
Tonnie Fanadez
UX Design Techdegree Graduate 22,796 Points

Dear Daniel Silva

Checked your code and you're doing a fantastic job. The only thing you missed was to convert to LowerCase.

Please see my code below.

return scores.stream()
             .map(Score::getGame)
             .map(String::toLowerCase)
             .map(word->word.split("\\W+"))
             .flatMap(Stream::of)
             .collect(Collectors.groupingBy(word->word, Collectors.counting()));

Thanks,

Tonnie