Game of Life LeetCode solution in JavaScript

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/**
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 * @param {number[][]} board
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 * @return {void} Do not return anything, modify board in-place instead.
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 */
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var gameOfLife = function (board) {
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  const m = board.length,
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    n = board[0].length;
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  let copy = JSON.parse(JSON.stringify(board));
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  const getNeighbor = (row, col) => {
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    let radius = [-1, 0, 1],
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      count = 0;
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    for (let i = 0; i < 3; i++) {
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      for (let j = 0; j < 3; j++) {
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        if (
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          !(radius[i] == 0 && radius[j] == 0) &&
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          copy[row + radius[i]] &&
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          copy[row + radius[i]][col + radius[j]]
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        ) {
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          let neighbor = copy[row + radius[i]][col + radius[j]];
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          if (neighbor == 1) {
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            count++;
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          }
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        }
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      }
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    }
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    return count;
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  };
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  for (let i = 0; i < m; i++) {
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    for (let j = 0; j < n; j++) {
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      const count = getNeighbor(i, j);
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      if (copy[i][j] == 1) {
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        if (count < 2 || count > 3) {
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          board[i][j] = 0;
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        }
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      } else {
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        if (count == 3) {
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          board[i][j] = 1;
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        }
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      }
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    }
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  }
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};