Day 12: Inheritance.js

'use strict';

var _input = '';
var _index = 0;
process.stdin.on('data', (data) => { _input += data; });
process.stdin.on('end', () => {
    _input = _input.split(new RegExp('[ \n]+'));
    main();    
});
function read() { return _input[_index++]; }

/**** Ignore above this line. ****/

class Person {
    constructor(firstName, lastName, identification) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.idNumber = identification;
    }
    
    printPerson() {
        console.log(
            "Name: " + this.lastName + ", " + this.firstName 
            + "\nID: " + this.idNumber
        )
    }
}

class Student extends Person {
    /*	
    *   Class Constructor
    *   
    *   @param firstName - A string denoting the Person's first name.
    *   @param lastName - A string denoting the Person's last name.
    *   @param id - An integer denoting the Person's ID number.
    *   @param scores - An array of integers denoting the Person's test scores.
    */
    constructor(firstName, lastName, idNumber, scores,){
        super(firstName, lastName, idNumber);
        this.scores = scores;
    }
    /*	
    *   Method Name: calculate
    *   @return A character denoting the grade.
    */
    calculate(){
        var sum =0;
        this.scores.map(s => {
            sum = sum + s;
        });
        let average = sum / this.scores.length;
        switch(true){
            case (average < 40):
                return "T";
                break;
            case (average < 55):
                return "D";
                break;
            case (average < 70):
                return "P";
                break;
            case (average < 80):
                return "A";
                break;
            case average < 90:
                return "E";
                break;
            case (average <= 100):
                return "O";
                break; 
        }
    }
}

function main() {
    let firstName = read()
    let lastName = read()
    let id = +read()
    let numScores = +read()
    let testScores = new Array(numScores)
    
    for (var i = 0; i < numScores; i++) {
        testScores[i] = +read()  
    }

    let s = new Student(firstName, lastName, id, testScores)
    s.printPerson()
    s.calculate()
    console.log('Grade: ' + s.calculate())
}