Find All Groups of Farmland LeetCode solution in JavaScript

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var findFarmland = function (land) {
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  let height = land.length;
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  let width = land[0].length;
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  let results = [];
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  let endRow = 0;
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  let endCol = 0;
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  let go = (i, j) => {
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    if (i < 0 || j < 0 || i >= height || j >= width || land[i][j] === 0) {
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      return;
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    }
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    endRow = Math.max(endRow, i);
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    endCol = Math.max(endCol, j);
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    land[i][j] = 0; // reset everything to 0
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    go(i + 1, j);
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    go(i - 1, j);
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    go(i, j + 1);
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    go(i, j - 1);
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  };
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  for (let i = 0; i < height; i++) {
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    for (let j = 0; j < width; j++) {
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      if (land[i][j] === 1) {
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        endRow = 0;
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        endCol = 0;
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        go(i, j);
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        results.push([i, j, endRow, endCol]);
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      }
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    }
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  }
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  return results;
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};