Find the count of the specified key in array

reduce,js

const employees = [
  { id: 101, name: 'john', group: 'tech-lead' },
  { id: 102, name: 'sam', group: 'associate' },
  { id: 103, name: 'danny', group: 'senior associate' },
  { id: 104, name: 'ketty', group: 'senior associate' },
  { id: 105, name: 'mili', group: 'junior' },
  { id: 106, name: 'mouli', group: 'senior associate' },
  { id: 107, name: 'George', group: 'senior associate' }
];

const employeesByGroup = employees.reduce((acc, employee) => {
  acc[employee.group] = acc[employee.group] + 1 || 1;
  return acc;
}, {});

console.log(employeesByGroup); // tech-lead: 1, associate: 1, senior associate: 4, junior: 1}