ما متوسّط الأعمار؟

اكتب دالة getAverageAge(users)‎ تأخذ مصفوفة من كائنات لها الصفة age وتُعيد متوسّط الأعمار.

معادلة المتوسّط: ‎(age1 + age2 + … + ageN) / N.

مثال:

          let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 29 };

let arr = [john, pete, mary];

alert(getAverageAge(arr)); // (25 + 30 + 29) / 3 = 28
        

function getAverageAge(users) {
  return users.reduce((prev, user) => prev + user.age, 0) / users.length;
}

let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 29 };

let arr = [ john, pete, mary ];

alert( getAverageAge(arr) ); // 28