861. Score After Flipping Matrix

var matrixScore = function(grid) {
    let m = grid.length
    let n = grid[0].length
    let res = Math.pow(2, n - 1) * m

    for (let j = 1; j < n; j++) {
        let curr = 0

        for(let i = 0; i < m; i++) {
            curr += grid[i][0] === grid[i][j] ? 1 : 0
        }

        res += Math.max(curr, m - curr) * Math.pow(2, n - 1 - j)
    }

    return res
};