Task 1 : Install Lodash Dependency
    npm i lodash
Task 2: Find unique department names using lodash ( _uniq)
    const _ = require('lodash'); // import the library using require

let departments = ["CSE","IT","CSE", "MECH"];
console.log("Departments:" , departments);
let uniqueDepartments = _.uniq ( departments);
console.log("Unique Department:", uniqueDepartments);
Task 3: Test
    node departments.js
//output:
//Departments: [ 'CSE', 'IT', 'CSE', 'MECH' ]
//Unique Department: [ 'CSE', 'IT', 'MECH' ]