[JS] CroCoder / 코딩테스트 입문 / 급여가 높은 부서

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문제

Map, Filter, Reduce - Code Exercises | CroCoder

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메모

Object.keys()

// 배열 속 객체 요소의 합

const objects = [{ x: 1 }, { x: 2 }, { x: 3 }];
const sum = objects.reduce((acc, cur) => acc + cur.x, 0); // 초기값 0 필수

console.log(sum); // 6

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정답

const employees = [
  { name: "John", salary: 50000, department: "IT" },
  { name: "Jane", salary: 60000, department: "HR" },
  { name: "Bob", salary: 55000, department: "IT" },
  { name: "Sophie", salary: 75000, department: "HR" },
  { name: "Mike", salary: 65000, department: "IT" },
  { name: "Emily", salary: 80000, department: "HR" },
  { name: "David", salary: 70000, department: "IT" },
];

const employeesByDepartment = employees.reduce((acc, cur) => {
  if (acc[cur.department] === undefined) {
    acc[cur.department] = [];
  }
  acc[cur.department].push(cur);
  return acc;
}, {});

const avgSalaryByDepartment = Object.keys(employeesByDepartment).map(x => {
  const sum = employeesByDepartment[x].reduce((acc, cur) => acc + cur.salary, 0);
  return { department: x, average: Math.floor(sum / employeesByDepartment[x].length) };
});

const answer = avgSalaryByDepartment.filter(x => x.average > 65000);

console.log(answer);

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