Refactor: extract a function to get a cell next generation

src/gameOfLife.ts

@@ -43,18 +43,22 @@ function isGenerative(liveNeighboursCount: number): boolean {
  return liveNeighboursCount === 3
 }
 
+function computeCellNextGeneration(grid: Grid, cellRow: number, cellCol: number): State {
+ const liveNeighboursCount = getLiveNeighboursCount(grid, cellRow, cellCol)
+
+ if (isDeadly(liveNeighboursCount)) {
+ return State.DEAD
+ } else if (grid[cellRow][cellCol] === State.ALIVE || isGenerative(liveNeighboursCount)) {
+ return State.ALIVE
+ } else {
+ return State.DEAD
+ }
+}
+
 export function computeNextGeneration(grid: Grid): Grid {
  return grid
  .map((row, rowIndex) =>
- row.map((_, colIndex) => {
- const liveNeighboursCount = getLiveNeighboursCount(grid, rowIndex, colIndex)
-
- if (isDeadly(liveNeighboursCount)) {
- return State.DEAD
- } else if (grid[rowIndex][colIndex] === State.ALIVE || isGenerative(liveNeighboursCount)) {
- return State.ALIVE
- } else {
- return State.DEAD
- }
- }))
+ row.map((_, colIndex) =>
+ computeCellNextGeneration(grid, rowIndex, colIndex)
+ ))
 }