most efficient way to find average using lodash

Question

I have an array of objects, the number of objects is variable -

var people = [{
  name: john,
  job: manager,
  salary: 2000
},
  {
  name: sam,
  job: manager,
  salary: 6000
},
  {
  name: frodo,
  job: janitor
}];

Whats the most elegant way to find the average of the salaries of all managers using lodash? ( I assume we have to check if an object is manager, as well as if the object has a salary property)

I was thinking in the below lines -

_(people).filter(function(name) {
    return name.occupation === "manager" && _(name).has("salary");}).pluck("salary").reduce(function(sum,num) { return sum+num });

But I am not sure if this is the right approach.

Answer 1

Why all people gets over-complicated here?

const people = [
  { name: 'Alejandro', budget: 56 },
  { name: 'Juan',      budget: 86 },
  { name: 'Pedro',     budget: 99 },
];

const average = _.meanBy(people, (p) => p.budget);
console.log(average);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>

As per the docs: https://lodash.com/docs/#meanBy