*

1 files changed, 42 insertions, 0 deletions

diff --git a/js/life.js b/js/life.js
new file mode 100644
index 0000000..443c796
--- /dev/null
+++ b/js/life.js
@@ -0,0 +1,42 @@
+const initialBoard = [
+  [0, 1, 0],
+  [0, 0, 1],
+  [1, 1, 1],
+  [0, 0, 0]
+]
+
+const getNextState = (board) => {
+  const rows = board.length
+  const cols = board[0].length
+
+  const countLiveNeighbors = (board, x, y) => {
+    return [-1, 0, 1].reduce((acc, dx) =>
+      acc + [-1, 0, 1].reduce((acc, dy) =>
+        (dx === 0 && dy === 0) || x + dx < 0 || y + dy < 0 || x + dx >= rows || y + dy >= cols ? acc : acc + board[x + dx][y + dy]
+      , 0)
+    , 0)
+  }
+
+  return board.map((row, x) =>
+    row.map((cell, y) => {
+      const liveNeighbors = countLiveNeighbors(board, x, y)
+      return (cell === 1 && (liveNeighbors === 2 || liveNeighbors === 3)) || (cell === 0 && liveNeighbors === 3) ? 1 : 0
+    })
+  )
+}
+
+const printBoard = (board) => {
+  console.clear()
+  console.log(board.map(row => row.join(' ')).join('\n'))
+}
+
+const runGame = async (initialBoard, generations) => {
+  let board = initialBoard
+  for (let i = 0; i < generations; i++) {
+    printBoard(board)
+    board = getNextState(board)
+    await new Promise(resolve => setTimeout(resolve, 500)) // wait before printing the next step.
+  }
+}
+
+runGame(initialBoard, 5)