JSFiddle - React, Tailwind, and code Playground

JavaScript

function countTotalSalary(company) {
  var totalSalary = 0;
  for (var employee in company) {
    var totalSalary += company[employee];
  }
  return totalSalary;
}

var company = {
  "Вася": 100,
  "Петя": 200,
  "Даша": 300
};
alert(countTotalSalary(company));