[JS] 삼총사

function solution(number) {
    var answer = 0;
    for(let i  = 0; i < number.length; i++) {
        for(let j = i + 1; j < number.length; j++) {
            for(let k = j + 1; k < number.length; k++) {
                if (number[i] + number[j] + number[k] == 0) {
                    answer += 1
                }
            }
        }
    }
    return answer;
}