null.js

const blogs =
[
  {
    _id: '5a422a851b54a676234d17f7',
    title: 'React patterns',
    author: 'Michael Chan',
    url: 'https://reactpatterns.com/',
    likes: 7,
    __v: 0
  },
  {
    _id: '5a422aa71b54a676234d17f8',
    title: 'Go To Statement Considered Harmful',
    author: 'Edsger W. Dijkstra',
    url: 'http://www.u.arizona.edu/~rubinson/copyright_violations/Go_To_Considered_Harmful.html',
    likes: 5,
    __v: 0
  },
  {
    _id: '5a422b3a1b54a676234d17f9',
    title: 'Canonical string reduction',
    author: 'Edsger W. Dijkstra',
    url: 'http://www.cs.utexas.edu/~EWD/transcriptions/EWD08xx/EWD808.html',
    likes: 12,
    __v: 0
  },
  {
    _id: '5a422b891b54a676234d17fa',
    title: 'First class tests',
    author: 'Robert C. Martin',
    url: 'http://blog.cleancoder.com/uncle-bob/2017/05/05/TestDefinitions.htmll',
    likes: 10,
    __v: 0
  },
  {
    _id: '5a422ba71b54a676234d17fb',
    title: 'TDD harms architecture',
    author: 'Robert C. Martin',
    url: 'http://blog.cleancoder.com/uncle-bob/2017/03/03/TDD-Harms-Architecture.html',
    likes: 0,
    __v: 0
  },
  {
    _id: '5a422bc61b54a676234d17fc',
    title: 'Type wars',
    author: 'Robert C. Martin',
    url: 'http://blog.cleancoder.com/uncle-bob/2016/05/01/TypeWars.html',
    likes: 2,
    __v: 0
  }
]
function getAuther(blogs){
  let temp  = {}
  for (let index of blogs){
    if(temp[index.author] === undefined){
      temp[index.author] = 1
    }
     else temp[index.author]++
  }
  let max = 0
  let auther = ''
  for(let index in temp){
    if(temp[index]>max){
      max = temp[index];
      auther = index;}
  }
  let result = {
  'auther': auther,
   'blogs':max
  }
  return result

  }

getAuther(blogs);