Check if Move is Legal LeetCode solution in JavaScript

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var checkMove = function (board, rMove, cMove, color) {
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  const moves = [-1, 0, 1];
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  let 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 (i === 1 && j === 1) continue;
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      const rowDir = moves[i];
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      const colDir = moves[j];
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      if (isLegal(rMove, cMove, rowDir, colDir, color, 1)) return true;
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    }
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  }
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  return false;
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  function withinBound(row, col) {
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    return row >= 0 && col >= 0 && row < 8 && col < 8;
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  }
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  function isLegal(currRow, currCol, rowDir, colDir, startColor, length) {
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    if (!withinBound(currRow, currCol)) return false; // we went passed the boundaries
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    if (board[currRow][currCol] === startColor) return length >= 3; // we seen another start color
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    if (board[currRow][currCol] === "." && length > 1) return false;
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    return isLegal(
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      currRow + rowDir,
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      currCol + colDir,
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      rowDir,
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      colDir,
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      startColor,
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      length + 1
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    );
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  }
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};