[프로그래머스 JavaScript] Level1 모의고사

function solution(answers) {
    var answer = [];
    var total1 = 0;
    var total2 = 0;
    var total3 = 0;
    
    for(var i = 0; i < answers.length; i++) {
        var index = i % 5
        if(index == 0) {
            answers[i] == 1 ? total1++ : total1;
        } else if(index == 1) {
            answers[i] == 2 ? total1++ : total1;
        } else if(index == 2) {
            answers[i] == 3 ? total1++ : total1;
        } else if(index == 3) {
            answers[i] == 4 ? total1++ : total1;
        } else if(index == 4) {
            answers[i] == 5 ? total1++ : total1;
        }
        
        var index2 = i % 8
        if(index2 == 1) {
            answers[i] == 1 ? total2++ : total2;
        } else if (index2 == 3) {
            answers[i] == 3 ? total2++ : total2;
        } else if (index2 == 5) {
            answers[i] == 4 ? total2++ : total2;
        } else if (index2 == 7) {
            answers[i] == 5 ? total2++ : total2;
        } else {
            answers[i] == 2 ? total2++ : total2;
        }
        
        var index3 = i % 10
        if(index3 == 0 || index3 == 1) {
            answers[i] == 3 ? total3++ : total3            
        } else if (index3 == 2 || index3 == 3) {
            answers[i] == 1 ? total3++ : total3
        } else if (index3 == 4 || index3 == 5) {
            answers[i] == 2 ? total3++ : total3
        } else if (index3 == 6 || index3 == 7) {
            answers[i] == 4 ? total3++ : total3
        } else if (index3 == 8 || index3 == 9) {
            answers[i] == 5 ? total3++ : total3
        }
    }
    
    var max = Math.max(total1, total2, total3)
    if(total1 == max) {
        answer.push(1)
    }
    if(total2 == max) {
        answer.push(2)
    }
    if(total3 == max) {
        answer.push(3)
    }
    answer.sort((a, b) => a - b)
    
    return answer;
}