wip incremental updates

src/main/client/src/model/board.js

@@ -169,32 +169,28 @@ export function isForbidden(board, groupInfo, currentColor) {
   return true
 }
 
-export function updateBoard(boardBeforeMove, move) {
+export function updateBoard(board, move) {
   let {pass, x, y, color} = move
   if (pass) {
-    return boardBeforeMove
+    return board
   }
-  let board = applyMove(boardBeforeMove, move)
+  board = applyMove(board, move)
   let oppositeColor = color ^ (WHITE | BLACK)
-  let size = board.length
-  let result = board
-  if (y > 0 && board[y - 1][x] === oppositeColor) {
-    result = removeDeadGroup(board, x, y - 1)
-  }
-  if (y < size - 1 && board[y + 1][x] === oppositeColor) {
-    result = removeDeadGroup(board, x, y + 1)
-  }
-  if (x > 0 && board[y][x - 1] === oppositeColor) {
-    result = removeDeadGroup(board, x - 1, y)
-  }
-  if (x < size - 1 && board[y][x + 1] === oppositeColor) {
-    result = removeDeadGroup(board, x + 1, y)
-  }
-  return result
+  board = removeDeadGroup(board, x, y - 1, oppositeColor)
+  board = removeDeadGroup(board, x, y + 1, oppositeColor)
+  board = removeDeadGroup(board, x - 1, y, oppositeColor)
+  board = removeDeadGroup(board, x + 1, y, oppositeColor)
+  return board
 }
 
-function removeDeadGroup(board, xx, yy) {
+function removeDeadGroup(board, xx, yy, color) {
   let dim = board.length
+  if (Math.min(xx, yy) < 0 || Math.max(xx, yy) >= dim) {
+    return board
+  }
+  if (board[yy][xx] !== color) {
+    return board
+  }
   if (yy > 0 && board[yy - 1][xx] == 0) {
     return board
   }
@@ -207,7 +203,6 @@ function removeDeadGroup(board, xx, yy) {
   if (xx < dim - 1 && board[yy][xx + 1] == 0) {
     return board
   }
-  let color = board[yy][xx]
   let acc = new PointList(dim)
   let pointsChecked = new PointSet(dim)
   pointsChecked.add(xx, yy)