# JavaScript in-place Solution

• Our update on the board cannot affect the judge of live neighbors, so we use work-around

``````/**
* @param {number[][]} board
* @return {void} Do not return anything, modify board in-place instead.
*/
let gameOfLife = (board) => {
for (let i = 0; i < board.length; i++) {
for (let j = 0; j < board[0].length; j++){
let liveCells = aliveNeighbors(board, i, j)
if (board[i][j] === 1 && (liveCells < 2 || liveCells > 3)) {
board[i][j] = 2
}
if (board[i][j] === 0 && liveCells === 3) {
board[i][j] = 3
}
}
}

for (let i = 0; i < board.length; i++) {
for (let j = 0; j < board[0].length; j++){
board[i][j] %= 2
}
}
};

let aliveNeighbors = (board, i, j) => {
let count = 0
let indexes = [[1, -1], [1, 0], [1, 1], [0, -1], [0, 1], [-1, -1], [-1, 0], [-1, 1]]
for (let index of indexes) {
if (index[0] + i < 0 || index[0] + i > board.length - 1 ||
index[1] + j < 0 || index[1] + j > board[0].length - 1) continue
if (board[index[0] + i][index[1] + j] === 1 ||
board[index[0] + i][index[1] + j] === 2) count++
}
return count
}
``````

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