04. Grades

function grades(input) {
    let student = Number(input[0]);
    let grade3 = 0;
    let grade4 = 0;
    let grade5 = 0;
    let grade6 = 0;
    let gradeSum = 0;

    for (let i = 1; i <= student; i++) {
        let grade = Number(input[i]);

        if (grade >= 5) {
            grade6++;
        } else if (grade >= 4) {
            grade5++;
        } else if (grade >= 3) {
            grade4++;
        } else if (grade >= 2) {
            grade3++;
        }
        gradeSum += grade;
    }

    console.log(`Top students: ${(grade6 / student * 100).toFixed(2)}%`);
    console.log(`Between 4.00 and 4.99: ${(grade5 / student * 100).toFixed(2)}%`);
    console.log(`Between 3.00 and 3.99: ${(grade4 / student * 100).toFixed(2)}%`);
    console.log(`Fail: ${(grade3 / student * 100).toFixed(2)}%`);
    console.log(`Average: ${(gradeSum / student).toFixed(2)}`);

}

РЕШЕНИЕ С WHILE И SHIFT():

function grades(input) {
    let student = Number(input.shift());
    let grade3 = 0;
    let grade4 = 0;
    let grade5 = 0;
    let grade6 = 0;
    let gradeSum = 0;

    while (input.length !== 0) {
        let grade = Number(input.shift());

        if (grade >= 5) {
            grade6++;
        } else if (grade >= 4) {
            grade5++;
        } else if (grade >= 3) {
            grade4++;
        } else if (grade >= 2) {
            grade3++;
        }
        gradeSum += grade;
    }

    console.log(`Top students: ${(grade6 / student * 100).toFixed(2)}%`);
    console.log(`Between 4.00 and 4.99: ${(grade5 / student * 100).toFixed(2)}%`);
    console.log(`Between 3.00 and 3.99: ${(grade4 / student * 100).toFixed(2)}%`);
    console.log(`Fail: ${(grade3 / student * 100).toFixed(2)}%`);
    console.log(`Average: ${(gradeSum / student).toFixed(2)}`);

}