Labirinth

function Solve(params) {
    var currentX = +params[1].split(" ")[1];
    var currentY = +params[1].split(" ")[0];
    var xNum = +params[0].split(" ")[1];
    var yNum = +params[0].split(" ")[0];
    var sum = 0; counter = 0;
    for (var i = 2; i < yNum + 2; i++) {
        var repl = params[i];
        params[i] = [];
        for (g = 0; g < xNum; g++) {
            params[i].push(repl[g]);
        }
    }

    while (currentX < xNum && currentX >= 0 && currentY < yNum && currentY >= 0 && params[currentY + 2][currentX] != null) {
        sum += currentY * xNum + currentX + 1;
        var moveDirection = params[currentY + 2][currentX];
        params[currentY + 2][currentX] = null;
        counter++;

        switch (moveDirection) {
            case "l": currentX--; break;
            case "r": currentX++; break;
            case "u": currentY--; break;
            case "d": currentY++; break;
        }
    }
    if (currentX < xNum && currentX >= 0 && currentY < yNum && currentY >= 0 && params[currentY + 2][currentX] == null) return "lost " + counter;
    return "out " + sum;
}