Game of Developer Life... Deconstructed

Transcript

1. Deconstructed Game of Life @MariuszGil

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4. Back to 1970

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9. Why game oF...

10. What How Why When

11. object oriented

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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(); } }

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']); } }

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; }

17. TDD FTW!

18. Objects identification

19. Objects ResponsibilitieS

20. Objects desigN

21. cell Universe Game Rule Populator Renderer

22. Patterns and principles object oriented

23. Domain driven design object oriented Patterns and principles

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

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26. apply(state, rules) =

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29. wrong AssumptionS

30. Future changeS

31. 2 3

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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; }
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37. So what?

38. stability / instability

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40. Cancer cell cell Universe Game Rule Populator cli Renderer 2D

    Coordinates stronger cell Always alive cell 3D Coordinates Svg Renderer

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42. to remember

43. questions? @MariuszGil

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