What's wrong with my code below? Couldn't spot any problem on my end. <https://jsfiddle.net/rz8y6vc7/>

```
function pyramid(n, row, level = '') {
  if (row === n) {
    return;
  }

  if (level.length === 2 * n - 1) {
    return pyramid(n, row + 1);
  }

  const midpoint = Math.floor((2 * n - 1) / 2);
  let add;
  if (midpoint - row <= level.length && midpoint + row => level.length) {
    add = '#';
  } else {
    add = ' ';
  }
  pyramid(n, row, level + add);
}

pyramid(4)

```

Got error on this line.`if (midpoint - row <= level.length && midpoint + row => level.length) {`