Extracting data from Nested Map using Recursion
Sat May 04 2024 Map and Recursion:
The getAllEmployeeNames function maps over each department, collecting the names of employees. For departments with subdepartments, the function recursively calls itself, ensuring all nested structures are processed.
FlatMap:
Another approach leverages flatMap to streamline the extraction process, concatenating employee names from both the main departments and their subdepartments in a single step.
1//map method to generate an array of all employee names across all departments and subdepartments of the company object
2const company = {
3 name: "Tech Solutions",
4 departments: [
5 {
6 name: "Engineering",
7 employees: [
8 { name: "Alice", role: "Software Engineer" },
9 { name: "Bob", role: "DevOps Engineer" }
10 ],
11 subdepartments: [
12 {
13 name: "Quality Assurance",
14 employees: [
15 { name: "Charlie", role: "QA Engineer" }
16 ],
17 subdepartments: []
18 }
19 ]
20 },
21 {
22 name: "Human Resources",
23 employees: [
24 { name: "David", role: "Recruiter" },
25 { name: "Eve", role: "Benefits Coordinator" }
26 ],
27 subdepartments: []
28 }
29 ]
30};
31
32
33function getAllEmployeeNames(departments){
34 return departments.map(department => {
35 let names = department.employees.map(employee => employee.name);
36 if (department.subdepartments && department.subdepartments.length > 0) {
37 department.subdepartments.forEach(subdepartment => {
38 names = names.concat(getAllEmployeeNames([subdepartment]));
39 });
40 }
41 return names;
42 }).flat();
43}
44
45let mappedarr = company.departments.flatMap(item => {
46 let totalItem = [...item.employees.map(item => item.name),...item.subdepartments.flatMap(item => item.employees.map(item => item.name))]
47 return totalItem
48})
49
50
51
52const employeeNames = getAllEmployeeNames(company.departments);
53console.log(employeeNames);
54console.log("mappedarr==>",mappedarr)