Game of Developer Life... Deconstructed

Transcript

1. Deconstructed
   Game of Life
   @MariuszGil
   

   View Slide

2. View Slide

3. View Slide

4. Back to 1970
   

   View Slide

5. View Slide

6. View Slide

7. View Slide

8. View Slide

9. Why game oF...
   

   View Slide

10. What How
    Why When
    

    View Slide

11. object oriented
    

    View Slide

12. View Slide

13. View Slide

14. private function calculateNewCellState($cell, $cellPosition) {
    $aliveCount = 0;
    $currentNeighbour = 0;
    $isFirstColumn = $cellPosition % $this->columns === 0;
    $isLastColumn = $cellPosition % $this->columns === $this->columns - 1;
    for ($i = 0; $i < 8; $i++) {
    $currentNeighbour = $cellPosition + $this->neighbourCoordinates[$i];
    if ($currentNeighbour > 0 && ($currentNeighbour < $this->boardLength) &&
    $this->currentGeneration[$currentNeighbour]->getState()) {
    if (($isFirstColumn && !in_array($i, [0, 3, 5])) || ($isLastColumn && !in_array($i, [2, 4, 7])) ||
    !($isFirstColumn || $isLastColumn)) {
    $aliveCount++;
    }
    }
    }
    if ($cell->getState() && ($aliveCount < 2 || $aliveCount > 3)) {
    return false;
    } else if (!$cell->getState() && $aliveCount === 3) {
    return true;
    } else {
    return $cell->getState();
    }
    }
    

    View Slide

15. protected function setCellDead(int $posN, int $posM)
    {
    $this->grid
    ->getCell($posN, $posM)
    ->setDead();
    }
    private function onePlay()
    {
    $cellsToUpdate = [];
    for ($n = 0; $n < $this->grid->getSizeN(); $n++) {
    for ($m = 0; $m < $this->grid->getSizeM(); $m++) {
    $neighboursCount = $this->grid->getCellNeighboursCount($n, $m);
    $cellsToUpdate[] = ['n' => $n, 'm' => $m, 'neighbours' => $neighboursCount];
    }
    }
    foreach ($cellsToUpdate as $cellStruct) {
    $this->rules->applyForCell($this->grid->getCell($cellStruct['n'], $cellStruct['m']),
    $cellStruct['neighbours']);
    }
    }
    

    View Slide

16. public function compute() {
    $computedGrid = [];
    foreach ($this->matrix as $row => $cellArr) {
    foreach ($cellArr as $col => $cell) {
    $ns = $this->checkLifeNeighbours($row, $col);
    $newCell = ($cell === null) ? $this->checkIfAwake($ns) : $this->setCellStatus($cell, $ns);
    $computedGrid[$row][$col] = $newCell;
    }
    }
    $this->matrix = $computedGrid;
    }
    private function setCellStatus(Cell $cell, int $lifeNeighbours)
    {
    $newCell = clone($cell);
    if ($cell->getIsAlive() && ($lifeNeighbours < 2 || $lifeNeighbours > 3)) {
    $newCell->setIsAlive(false);
    } elseif (!$cell->getIsAlive() && 3 == $lifeNeighbours) {
    $newCell->setIsAlive(true);
    }
    return $newCell;
    }
    

    View Slide

17. TDD FTW!
    

    View Slide

18. Objects identification
    

    View Slide

19. Objects ResponsibilitieS
    

    View Slide

20. Objects desigN
    

    View Slide

21. cell
    Universe Game
    Rule
    Populator
    Renderer
    

    View Slide

22. Patterns and principles
    object oriented
    

    View Slide

23. Domain driven design
    object oriented
    Patterns and principles
    

    View Slide

24. Functional programming
    object oriented
    Patterns and principles
    Domain driven design
    

    View Slide

25. View Slide

26. apply(state, rules) =
    

    View Slide

27. View Slide

28. View Slide

29. wrong AssumptionS
    

    View Slide

30. Future changeS
    

    View Slide

31. 2 3
    

    View Slide

32. View Slide

33. 4 6
    

    View Slide

34. View Slide

35. private function checkIfAwake($lifeNeighbours)
    {
    return (3 == $lifeNeighbours) ? new Cell(true) : null;
    }
    private function checkLifeNeighbours(int $row, int $col)
    {
    $life = 0;
    for ($rowMatrix = $row-1; $rowMatrix <= $row+1; $rowMatrix++)
    {
    for ($colMatrix = $col-1; $colMatrix <= $col+1; $colMatrix++)
    {
    if ($colMatrix == $col && $rowMatrix == $row) continue;
    if (isset($this->matrix[$rowMatrix][$colMatrix]) &&
    $this->matrix[$rowMatrix][$colMatrix]->getIsAlive()) {
    $life++;
    }
    }
    }
    return $life;
    }
    

    View Slide

36. View Slide

37. So what?
    

    View Slide

38. stability / instability
    

    View Slide

39. View Slide

40. Cancer cell
    cell
    Universe Game
    Rule Populator
    cli Renderer
    2D Coordinates
    stronger cell
    Always alive cell
    3D Coordinates Svg Renderer
    

    View Slide

41. 19 95
    

    View Slide

42. to remember
    

    View Slide

43. questions?
    @MariuszGil
    

    View Slide

44. View Slide