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I enjoyed this course. It gives a pretty good view into the more useful parts of the language and definitely makes a great case for a Java developer to become a Kotlin convert. My only complaints about this course are in regard to the GameOfFifteen assignment. The README on what they are looking for points to a web version of the game and basically says to implement an isEven function to check if a permutation is solvable and then implement the game interface to get everything working. The problem is this: I implemented my game just the way the web game works - specifically, my game chose a random cell to be the empty cell upon initialization, just as the web game did. I also set up my "hasWon" state to be the case where the numbers are in order AND the empty cell is in the bottom-right position, just as the web game seemed to be showing. When I ran the tests on my project, they failed. I had to do a debug deep dive to find that the tests are expecting that hasWon can be true regardless of the position of the empty cell, as long as the numbers are in order and to find that the tests expect the game to always initialize with the empty cell in the bottom-right position. It was easy enough to fix my game to match their tests rather than the example game, but I lost some time unnecessarily to this. It would probably be helpful to others who take this course if a couple simple notes in the README were added to indicate that the game should initialize with the empty cell in the bottom-right position and that the game is won if the cells are in ascending numerical order regardless of the position of the empty cell.

Course is an awesome starter for a deep dive into kotlin. Lectures material is great. Assignments could be improved though. Descriptions of certain tasks was a bit cryptic. I had to analyze test cases to figure out what actually needs to be implemented and those tests cases are not complete either had to add more when intergation ones failed.

Here is an example of what I mean from the last week assignment: "The board for the game of Fifteen is filled randomly with numbers from 1 to 15 and one empty space. " Here sounds like word "randomly" also relates to the empty space e.g. we should put space at random possition between permutations. This is exactly what I did, I also played the actual game implementation provided and it works the same way e.g. when you shuffle space is at random position. So my implementation seems correct, but all the tests fail. Why? Because in all the scenarious there is an assumtion that empty cell is always the last one so I had to rewrite the logic to match tests.

Overall, great course that accomplishes what it promises. I learned how to develop in Kotlin relying on already knowing Java. Pros: The videos are clear and concise, with high "signal-to-noise ratio". Tests during the videos were on point and exposed common misconceptions people commonly have when learning Kotlin. The solution videos after completing the weekly projects were helpful in making working code more efficient and readable. Cons: The instructions for Week 3 incorrectly specified what was required, leading me on a wild goose chase for several hours. There were only solution videos for weeks 1 to 3. It appears nobody monitors the discussion forums anymore. There's questions asked 2 years ago with many "me too"s, but no response from staff.

I liked this course but to be honest, I found that the assignments were a little difficult to understand due to the concepts they were related with. The last assignment related to the Fifteen game, it was a little complicated to understand how to get the parity of a permutation. Situations like this made the exercise a little frustating because I understood the Kotlin concepts but it wasn't enough to finish the assignments. Probably like in the real life problems :)

Just wanted to let you know, just in case can help in some way to improve the way how the assignments are provided. Maybe explain a little further about some extra concepts or something else.

Thank you for this great course!