test1.js

func1 = (myObjArray) => {
myObjArray.sort((a,b) => { return a.ranking - b.ranking; });
};

func2 = (myObjArray) => {
let acc = 0;
let len = myObjArray.length;

for(let i=0; i<len; i++) {
acc = acc + myObjArray[i].ranking;
}

return acc / len;
};