Game of Developer Life... Deconstructed

Transcript

1. Deconstructed Game of Life @MariuszGil
4. Back to 1970
9. Why game oF...
10. What How Why When
11. object oriented
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 $newCell; }
17. TDD FTW!
18. Objects identification
19. Objects ResponsibilitieS
20. Objects desigN
21. cell Universe Game Rule Populator Renderer
22. Patterns and principles object oriented
23. Domain driven design object oriented Patterns and principles
24. Functional programming object oriented Patterns and principles Domain driven design
26. apply(state, rules) =
29. wrong AssumptionS
30. Future changeS
31. 2 3
33. 4 6
35. private function checkIfAwake($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; }
37. So what?
38. stability / instability
40. Cancer cell cell Universe Game Rule Populator cli Renderer 2D Coordinates stronger cell Always alive cell 3D Coordinates Svg Renderer
41. 19 95
42. to remember
43. questions? @MariuszGil