Average and Sort

avg.js

const arr = [
    {
        "name": "Jeff",
        "ranking": 1
    },
    {
        "name": "Kevin",
        "ranking": 5
    },
    {
        "name": "Wanda",
        "ranking": 9
    },    
    {
        "name": "Jerry",
        "ranking": 2
    }
]
const avg = arr.reduce((a, b) => a + b.ranking, 0) / arr.length
console.log(avg)

sort.js

const arr = [
    {
        "name": "Jeff",
        "ranking": 1
    },
    {
        "name": "Kevin",
        "ranking": 5
    },
    {
        "name": "Wanda",
        "ranking": 9
    },    
    {
        "name": "Jerry",
        "ranking": 2
    }
]

console.log(arr.sort((a, b) => a.ranking - b.ranking))