// Необходимо сделать выборки.
// 1. Список имен, отсортированный по размеру зарплаты
// 2. Размер максимальной зарплаты
// 3. Статистика по каждому отделу: сумма затрат, количество сотрудников, средняя з/п
 
const arr = [
  { name: "Вася", salary: 10000, department: "Frontend" },
  { name: "Петя", salary: 12000, department: "Backend" },
  { name: "Дима", salary: 10500, department: "Frontend" },
  { name: "Оля", salary: 15000, department: "Backend" },
  { name: "Саша", salary: 8000, department: "Frontend" },
  { name: "Олег", salary: 9000, department: "Testing" },
];

function salary(arr) {
  const sorted = arr.sort((a, b) => {
    return b.salary - a.salary;
  });
 
  const maxSalary = sorted[0].salary;
 
  const objSalary = {};
 
  arr.forEach((employee) => {
    const { salary, department } = employee;
 
    if (!objSalary[department]) {
      objSalary[department] = {
        sum: 0,
        count: 0,
        average: 0,
      };
    }
 
    objSalary[department].sum += salary;
    objSalary[department].count++;
  });
 
  for (let departments in objSalary) {
    const { sum, count } = objSalary[departments];
 
    objSalary[departments].average = sum / count;
  }
 
  return { sorted, maxSalary, objSalary };
}