closures.js

const students = [
  {
    name: "Indrek",
    score: 33.99
  },
  {
    name: "John",
    score: 50.35
  },
  {
    name: "Alice",
    score: 63.35
  }
];
                

const addScores = (accumulator, currentValue) => Math.round(accumulator + currentValue.score)

const calcAverageScore = students.reduce(addScores, 0)

console.log(calcAverageScore); // 147