04. Train The Trainers

function trainTheTrainers(input) {
    let scoreNum = Number(input[0]);
    let presentation = input[1];
    let presentationCounter = 0;
    let totalAverage = 0;
    let index = 2;

    while (presentation !== 'Finish'){
        let grade = 0
        for (let i = 0; i < scoreNum; i++){
            grade += Number(input[index++]);
        }
        console.log(`${presentation} - ${(grade / scoreNum).toFixed(2)}.`);
        totalAverage += grade / scoreNum;
        presentation = input[index++];
        presentationCounter++;
    }
    console.log(`Student\'s final assessment is ${(totalAverage / presentationCounter).toFixed(2)}.`);
}

Решение със shift():

function trainTheTrainers(input) {
    let scoreNum = Number(input.shift());
    let presentation = input.shift();
    let presentationCounter = 0;
    let totalAverage = 0;

    while (presentation !== 'Finish'){
        let grade = 0
        for (let i = 0; i < scoreNum; i++){
            grade += Number(input.shift());
        }
        console.log(`${presentation} - ${(grade / scoreNum).toFixed(2)}.`);
        totalAverage += grade / scoreNum;
        presentation = input.shift();
        presentationCounter++;
    }
    console.log(`Student\'s final assessment is ${(totalAverage / presentationCounter).toFixed(2)}.`);
}

РЕШЕНИЕ С FOR И SHIFT():

function trainTheTrainers(input) {
    let scoreNum = Number(input.shift());
    let totalAverage = 0;

    for (let i = 0; i < Number.MAX_SAFE_INTEGER; i++) {
        let presentation = input.shift();
        if (presentation === 'Finish') {
            console.log(`Student\'s final assessment is ${(totalAverage / i).toFixed(2)}.`);
            break;
        }
        let grade = 0;
        for (let j = 0; j < scoreNum; j++) {
            grade += Number(input.shift());
        }
        console.log(`${presentation} - ${(grade / scoreNum).toFixed(2)}.`);
        totalAverage += grade / scoreNum;
    }
}