Two functions to 1. Sort a javascript array 2. Return average ranking

javascript-array-sort-average.js

const arr = [
  { name: "John", rank: 2 },
  { name: "Mathew", rank: 4 },
  { name: "Alex", rank: 1 },
]

/**
 * @func sortArray 
 * @desc Sort an array of object by rank
 * @params {Array} arr an array of objects
 * @params {string} arr.name name of an object
 * @params {number} arr.rank a number representing rank
 * @returns {Array} a sorted array
 */
const sortArray = (arr = []) => {
  const result = arr.sort((a,b) => (a.rank > b.rank) ? 1 : ((b.rnak > a.rank) ? -1 : 0)); 

  return result
}

/**
 * @func averageRank
 * @desc Return average ranking
 * @params {Array} arr an array of objects
 * @params {string} arr.name name of an object
 * @params {number} arr.rank a number representing rank
 * @returns {number} average ranking
 */
const averageRank = (arr) => {
  let tempArr = arr.map(obj => obj.rank);
  let totalRanks = tempArr.reduce((accumulator, current) => accumulator + current )

  return totalRanks / arr.length;
}