View difference between Paste ID: TscXpEzL and C8Yj0MJ3

 class Company {
   constructor() {
     this.departments = [];
   }
 
   addEmployee(username, salary, position, department) {
     for (let arg of [username, salary, position, department]) {
       this.validate(arg);
     }
 
     if (!this.departments[department]) {
       this.departments[department] = [];
     }
 
     this.departments[department].push({ username, salary, position });
 
     return `New employee is hired. Name: ${username}. Position: ${position}`;
   }
 
   bestDepartment() {
     //department - avg salary
     let departments = {};
     Object.entries(this.departments).forEach(([department, employees]) => {
       let totalSalary = employees
         .map((e) => e.salary)
         .reduce((acc, curr) => (acc += curr));
 
       departments[department] = totalSalary / employees.length;
     });
 
     let maxSalary = 0;
     let bestDepartment;
     Object.entries(departments).forEach(([department, avgSalary]) => {
       if (avgSalary > maxSalary) {
         maxSalary = avgSalary;
         bestDepartment = department;
       }
     });
 
     let output = `Best Department is: ${bestDepartment}\nAverage salary: ${departments[
       bestDepartment
     ].toFixed(2)}\n`;
 
     this.departments[bestDepartment]
       .sort(
         (a, b) => b.salary - a.salary || a.username.localeCompare(b.username)
       )
       .forEach((e) => {
         output += `${e.username} ${e.salary} ${e.position}\n`;
       });
 
     return output.trim();
   }
 
   validate(value) {
     if (!value || value < 0) {
       throw new Error("Invalid input!");
     }
   }
 }