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Java Introduction to Functional Programming Reduction and Aggregation Reduce Housing Records

Chris Sabo
Chris Sabo
3,970 Points
Posted by Chris Sabo
Chris Sabo
3,970 Points

HomeValue reduction wrong types?

Working on the reduction exercise, I see the following for lowest price

public static OptionalInt getLowestHomeValueIndexDeclaratively(List<HousingRecord> records) {

I got that working no issues, however the method for highest isn't "OptionalInt" its "Optional<HousingRecord>". I can fix this, but then the tests are broken.

I'm not sure if I'm doing this wrong or there's an error in the tests/code.

Thomas Salai
Thomas Salai
4,964 Points
Thomas Salai
Thomas Salai
4,964 Points

Can you post here stacktrace log from the test?

Vuyolwenkosi Tshuma
Vuyolwenkosi Tshuma
4,830 Points

Hi Chris, I'm having the same problem and now my progress is on hold

2 Answers

Energy Efficient
PLUS
Energy Efficient
Courses Plus Student 92 Points
Energy Efficient
Energy Efficient
Courses Plus Student 92 Points

There's something wrong with the upload and test feature of this course. As long as your code passes the test and can run the prepareSubmission task then you're good. Don't bang your head on it pass that point like I'm sure many of us already have.

James Sawkins
James Sawkins
4,914 Points
James Sawkins
James Sawkins
4,914 Points

I was having the same issue, as I was trying to keep with the provided return statement BUT once I ignored this and mirrored how steams where laid out in the previous lessons, changing it up to match lesson on reduction. it became so much clearer :-)

public static OptionalInt getLowestHomeValueIndexDeclaratively(List<HousingRecord> records) {
    // TODO: Create a stream off the records
        return records.stream()
    // TODO: Map the stream to an IntStream on `HousingRecord.getCurrentHomeValueIndex` to expose new methods
            .mapToInt(HousingRecord::getCurrentHomeValueIndex)
    // TODO: Return the minimum value from the stream.  It should be an optional because records could be empty.
            .min();
  }