index.ts

import inquirer from "inquirer";

class Student {
    name: string;
    constructor(n: string) {
        this.name = n;
    }
}

class Person {
    students: Student[] = [];
    addStudent(obj: Student) {
        this.students.push(obj);
    }
}

const persons = new Person();

const programStart = async (persons: Person) => {
    console.log("Welcome!");
    
    while (true) {
        const ans = await inquirer.prompt({
            name: 'select',
            type: 'list',
            message: 'Whom would you like to interact with?',
            choices: ['staff', 'student', 'exit']
        });

        if (ans.select == 'staff') {
            console.log('You approach the staff room. Please feel free to ask any question.');
        } else if (ans.select == "student") {
            const ansStudent = await inquirer.prompt({
                name: "student",
                type: "input",
                message: "Enter the student's name you wish to engage with:"
            });
            const student = persons.students.find(val => val.name == ansStudent.student);
            if (!student) {
                const newStudent = new Student(ansStudent.student);
                persons.addStudent(newStudent);
                console.log(`Hello, I am ${newStudent.name}. Nice to meet you.`);
                console.log("New student added.");
                console.log("Current student list:");
                console.log(persons.students);
            } else {
                console.log(`Hello, I am ${student.name}. Nice to see you again!`);
                console.log("Existing student list:");
                console.log(persons.students);
            }
        } else if (ans.select == "exit") {
            console.log("Exiting the program!");
            process.exit();
        }
    }
};

programStart(persons);