[Programmers] 행렬의 덧셈 JS

function solution(arr1, arr2) {
    var answer = [];
    for(let i=0; i<arr1.length; i++){
        answer.push([]);
        for(let j=0; j<arr1[0].length; j++){
            answer[i].push(arr1[i][j] + arr2[i][j]);
        }
    }
    return answer;
}