[OlesiaBOM]

Нужно вернуть количество comments и post автора. Как посчитать количество comments ?

const getQuantityPostsByAuthor = (listOfPosts, authorName) => {
  let att = 0;
  let com = 0;
  listOfPosts.forEach(function (arrayItem) {
    if (arrayItem.author === authorName) {
      att += 1;
    }
    if (arrayItem.comments.author === authorName) {//попытка вернуть количество comment ;
      com += 1;
    }
  });
  return `Post:${att},comments:${com}` //`Post:${att} ,comments:${com}`;
};
let listOfPosts2 = [
  {
    id: 1,
    post: 'some post1',
    title: 'title 1',
    author: 'Ivanov',
    comments: [
      {
        id: 1.1,
        comment: 'some comment1',
        title: 'title 1',
        author: 'Rimus'
      },
      {
        id: 1.2,
        comment: 'some comment2',
        title: 'title 2',
        author: 'Uncle'
      }
    ]
  },
  {
    id: 2,
    post: 'some post2',
    title: 'title 2',
    author: 'Ivanov',
    comments: [
      {
        id: 1.1,
        comment: 'some comment1',
        title: 'title 1',
        author: 'Rimus'
      },
      {
        id: 1.2,
        comment: 'some comment2',
        title: 'title 2',
        author: 'Uncle'
      },
      {
        id: 1.3,
        comment: 'some comment3',
        title: 'title 3',
        author: 'Rimus'
      }
    ]
  },
  {
    id: 3,
    post: 'some post3',
    title: 'title 3',
    author: 'Rimus'
  },
  {
    id: 4,
    post: 'some post4',
    title: 'title 4',
    author: 'Uncle'
  }

];
console.log(getQuantityPostsByAuthor(listOfPosts2, 'Rimus'));