EmployeeDetailsBasedOnOrganizationID.html

const organizations = 
    [
      {name: 'Razorthink', id: 1, employees: [0, 3]}, 
      {name: 'Apple', id: 2, employees: [1]}, 
      {name: 'Microsoft', id: 3, employees: [4]}
    ]
const people = 
    [
      {name: 'Sandeep', empId: 0, age: 23, orgId: 1}, 
      {name: 'Arjun', empId: 1, age: 25, orgId: 2}, 
      {name: 'Nanha', empId: 3, age: 22, orgId: 1},
      {name: 'Nandu', empId: 4, age: 53, orgId: 3}  
    ]

const orgDetails = (orgId) => organizations.find((orgEl) => orgEl.id == orgId);
const peopleDetails = (emp) => people.find((empEl) => empEl.empId == emp);

const org = orgDetails(1);
const eId = (org.employees).map((item) => peopleDetails(item));

//console.log("OrgDetails", org);
//console.log("eId", eId);

const arr = Object.assign({}, org, {employees: eId});
console.log("RESULT", arr);