javascript transpose array

1transpose = m => m[0].map((x,i) => m.map(x => x[i]))

1array[0].map((_, colIndex) => array.map(row => row[colIndex]));

1class Solution {
2    solve(matrix) {
3        let arr=[];
4        for(let i=0;i<matrix.length;i++){
5            arr.push([])
6            for(let j=0;j<matrix.length;j++){
7                arr[i].push(matrix[j][i])
8            }
9        }
10        return arr
11    }
12}