mentor_oct_12.js

function sortByLength(arr = []) {
  for (let j = 0; j < arr.length; j++) {
    for (let i = 0; i < arr.length - j; i++) {
      const [x, y] = [arr[i], arr[i + 1]]
      if (arr[i + 1] && arr[i].length > arr[i + 1].length) swap(arr, i, i + 1)
    }
  }
  console.log(arr)
  return arr
}

function swap(arr, i, j) {
  const x = arr[i]
  const y = arr[j]
  arr[j] = x
  arr[i] = y
}

const users = [
  { name: 'John', age: 23, numberOfCars: 1 },
  { name: 'Rahul', age: 50, numberOfCars: 2 },
  { name: 'Clark', age: 98, numberOfCars: 20 },
  { name: 'Dev', age: 90, numberOfCars: 3 },
  { name: 'Elliot', age: 82, numberOfCars: 1 },
  { name: 'Anderson', age: 19, numberOfCars: 5 },
  { name: 'James', age: 41, numberOfCars: 6 },
  { name: 'Chad', age: 32, numberOfCars: 11 },
]

function minDiffAge(userName) {
  const userObj = users.filter(({ name }) => name === userName)[0];
  if (!userObj) return;
  let minDiff = Infinity
  let res;
  let cars = -Infinity;
  users.filter(({ name }) => name !== userName).forEach(({ age, name, numberOfCars }) => {
    const currDiff = Math.abs(userObj.age - age)
    if (currDiff < minDiff) {
      minDiff = currDiff
      res = name
      cars = numberOfCars
    }
    if (currDiff === minDiff) {
      if (numberOfCars > cars) {
        cars = numberOfCars
        res = name
      }
    }
  })
  console.log(res)
  return res
}

minDiffAge('Dev'); // 'Clark'
minDiffAge('Elliot'); // 'Dev'
minDiffAge('Chad'); // 'James'
minDiffAge('Cassey'); //  undefined