Test file for Average and Sort from a given array of objects

AverageAndSort.js

// lets assume myObject is array of objects
let myObject = [
{name:"a",ranking:4},
{name:"b",ranking:6},
{name:"c",ranking:5},
{name:"d",ranking:3}
];

// I am assumping all data is not validated before,
// hence checking for number

// Using ES6 and array reduce function
const average = arr => arr.reduce((total, current) =>
     total + (isNaN(current.ranking)? 0:current.ranking), 0) / arr.length;
//alert("average is "+average(myObject));

// Average Using for Loop
function averageUsingLoop(array) {
  var total = 0;
  for ( var i = 0; i < array.length; i++ ){
    if(!isNaN(array[i].ranking)) {
      total += array[i].ranking;
    }
  }
  return total/array.length;
};

//alert("average using loop is "+averageUsingLoop(myObject));

// Using function to provide custom sort
let sortedObj = myObject.sort(function(a, b) {
    return (a.ranking<b.ranking?-1:(a.ranking>b.ranking?1:0));
});