02. Exam Preparation

function examPreparation(input) {
    let poorGradesLimit = Number(input[0]);
    let poorGradesCount = 0;
    let countProblems = 0;
    let lastProblem = 0;
    let sumGrades = 0;
    let index = 1;

    let command = input[index];
    while (command !== "Enough") {
        lastProblem = command;
        let grade = Number(input[index + 1]);

        if (grade <= 4) {
            poorGradesCount++;
            if (poorGradesCount === poorGradesLimit) {
                break;
            }
        }
        index += 2;
        countProblems++;
        sumGrades += grade;
        command = input[index];
    }

    let averageGrade = sumGrades / countProblems;

    if (command !== "Enough") {
        console.log(`You need a break, ${poorGradesCount} poor grades.`);
    } else {
        console.log(`Average score: ${averageGrade.toFixed(2)}\nNumber of problems: ${countProblems}\nLast problem: ${lastProblem}`);
    }
}

ИЛИ:

function examPreparation(input) {
    let poorGradesLimit = Number(input[0]);
    let poorGradesCount = 0;
    let countProblems = 0;
    let lastProblem = 0;
    let sumGrades = 0;
    let index = 1;

    while (true) {
        let command = input[index++];
        if (command === "Enough") {
            console.log(`Average score: ${(sumGrades / countProblems).toFixed(2)}\nNumber of problems: ${countProblems}\nLast problem: ${lastProblem}`);
            break;
        }

        lastProblem = command;
        let grade = Number(input[index++]);

        if (grade <= 4) {
            poorGradesCount++;

            if (poorGradesLimit === poorGradesCount) {
                console.log(`You need a break, ${poorGradesCount} poor grades.`);
                break;
            }
        }
        sumGrades += grade;
        countProblems++;
    }
}


РЕШЕНИЕ С ТЕРНАРЕН ОПЕРАТОР И ЛЕКО ТАРИКАТСКАТА:)

function examPreparation(input) {
    let poorGradesCount = 0;
    let sumGrade = 0;
    let index = 1;

    while (input[index] !== "Enough" && poorGradesCount !== Number(input[0])) {
        poorGradesCount += Number(input[++index]) <= 4 ? 1 : 0;
        sumGrade += Number(input[index++]);
    }

    console.log(input[index] !== "Enough" ? `You need a break, ${input[0]} poor grades.` :
        `Average score: ${(sumGrade / parseInt(index / 2)).toFixed(2)}\nNumber of problems: ${parseInt(index / 2)}\nLast problem: ${input[index - 2]}`);
}