How to add and find the average value of an object?

Question

JavaScript

There are 4 objects, how can I calculate the average age in them?
1) friend1 {
name: Ihor
age: 22
}
2) friend2 {
name: Vlad
age:25
}
3) friend3 {
name: Oleh
age: 28
}
4) friend4 {
name: Sasha
age:20
}

Answer 1

Put the objects into an array, and

arr.reduce((acc, n) => acc + n.age, 0) / arr.length