03.SchoolGrades

//problem 3 - School Grades
function arrangeStudents(input) {
    let students = {};
    for (let line of input) {
        let [t1, name, t2, grade, t3, avgScore] = line.split(/: |, /).filter(t => t !== '');
        grade = (+grade + 1).toString();

        if(+avgScore >= 3){
            if(!students.hasOwnProperty(grade)) {
                students[grade] = [];
                students[grade].avgGrade = 0;
            }
            if (!students[grade].includes(name)) {
                students[grade].push(name);
                students[grade].avgGrade += +avgScore
            }
        }
    }

    let result = [];
    let sortedGrades = Object.keys(students).sort((a,b) => +a - +b);
    for (const key of sortedGrades) {
        result.push(key + ' Grade ');
        result.push(`List of students: ${students[key].join(', ')}`);
        let avgToPrint = students[key].avgGrade / students[key].length;
        result.push(`Average annual grade from last year: ${avgToPrint.toFixed(2)}`);
        result.push('');
    }

    return result.join('\n');

}


console.log(arrangeStudents(
    ['Student name: Mark, Grade: 8, Graduated with an average score: 4.75',
    'Student name: Ethan, Grade: 9, Graduated with an average score: 5.66',
    'Student name: George, Grade: 8, Graduated with an average score: 2.83',
    'Student name: Steven, Grade: 10, Graduated with an average score: 4.20',
    'Student name: Joey, Grade: 9, Graduated with an average score: 4.90',
    'Student name: Angus, Grade: 11, Graduated with an average score: 2.90',
    'Student name: Bob, Grade: 11, Graduated with an average score: 5.15',
    'Student name: Daryl, Grade: 8, Graduated with an average score: 5.95',
    'Student name: Bill, Grade: 9, Graduated with an average score: 6.00',
    'Student name: Philip, Grade: 10, Graduated with an average score: 5.05',
    'Student name: Peter, Grade: 11, Graduated with an average score: 4.88',
    'Student name: Gavin, Grade: 10, Graduated with an average score: 4.00']
));