import Foundation
let rows = 10
let cols = 10
var board = Array(repeating: Array(repeating: 0, count: cols), count: rows)
func printBoard(_ board: [[Int]]) {
board.forEach { row in
row.forEach { cell in
print(cell == 1 ? "@" : ".", terminator: "")
}
print()
}
print("\n")
}
func countLiveNeighbors(_ board: [[Int]], x: Int, y: Int) -> Int {
let directions = [(-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1)]
return directions.reduce(0) { count, dir in
let newX = x + dir.0
let newY = y + dir.1
if newX >= 0 && newX < rows && newY >= 0 && newY < cols {
return count + board[newX][newY]
}
return count
}
}
func nextGeneration(_ currentBoard: [[Int]]) -> [[Int]] {
return currentBoard.enumerated().map { (x, row) in
return row.enumerated().map { (y, cell) in
let liveNeighbors = countLiveNeighbors(currentBoard, x: x, y: y)
if cell == 1 && (liveNeighbors < 2 || liveNeighbors > 3) {
return 0
} else if cell == 0 && liveNeighbors == 3 {
return 1
}
return cell
}
}
}
board[1][2] = 1
board[2][3] = 1
board[3][1] = 1
board[3][2] = 1
board[3][3] = 1
for _ in 0..<10 {
printBoard(board)
board = nextGeneration(board)
sleep(1) // FIXME: figure out how to sleep for periods shorter than a full second
}