02. Exam Preparation - while - loops - ex

function examPreparation(input) {
    let minPoorGrades = Number(input.shift());

    let allGrades = 0;
    let examCount = 0;
    let lastExam = "";
    let poorGrades = 0;

    let currentExam = input.shift();
    let currentGrade = Number(input.shift());

    let isEnough = (currentExam !== "Enough");
    let isPoorGradesHit = (poorGrades < minPoorGrades);

    while (isEnough && isPoorGradesHit) {

        if(currentGrade <= 4){
            poorGrades++;
        }
        lastExam = currentExam;
        examCount++;
        allGrades +=currentGrade;

        currentExam = input.shift();
        currentGrade = Number(input.shift());

        isEnough = currentExam !== "Enough";
        isPoorGradesHit = (poorGrades < minPoorGrades);
    }

    if(poorGrades < minPoorGrades){
        let averageGrade = allGrades / examCount;

        console.log(`Average score: ${averageGrade.toFixed(2)}`);
        console.log(`Number of problems: ${examCount}`);
        console.log(`Last problem: ${lastExam}`);
    } else {
        console.log(`You need a break, ${poorGrades} poor grades.`);
    }
}