Horsy

function solve(args) {
    function offRange(matrix, row, col) {
        var rowss = matrix.length;
        var colss = matrix[0].length;
        return row<0 || col<0 || row>rowss-1 || col>colss-1;
    }

    function matrix(rows, cols) {
        value = false;
        var arr = [];
        for (var i = 0; i < rows; i++) {
            arr.push([]);
            arr[i].push(new Array(cols));
            for (var j = 0; j < cols; j++) {
                arr[i][j] = value;
            }
        }

        return arr;
    }

    function getMovement(dir) {
        switch(dir) {
            case '1':
                return directions.one;
                break;
            case '2':
                return directions.two;
                break;
            case '3':
                return directions.three;
                break;
            case '4':
                return directions.four;
                break;
            case '5':
                return directions.five;
                break;
            case '6':
                return directions.six;
                break;
            case '7':
                return directions.seven;
                break;
            case '8':
                return directions.eight;
                break;
        }
    }

    var dimentions = args[0].split(' ');
    var rows = parseInt(dimentions[0]);
    var cols = parseInt(dimentions[1]);

    var visited = matrix(rows, cols);
    var moves = args.slice(1);

    var row = visited.length - 1;
    var col = visited[0].length - 1;

    var directions = {
    one: {  row: -2,    col: 1},
    two: {  row: -1,    col: 2},
    three: {    row: 1, col: 2},
    four: { row: 2, col: 1},
    five: { row: 2, col: -1},
    six: {  row: 1, col: -2},
    seven: {    row: -1,    col: -2},
    eight: {    row: -2,    col: -1}
    };

    var sum = 0;
    var move = 0;

    while (true) {
        if (offRange(visited, row, col)) {
            return 'Go go Horsy! Collected ' + sum +' weeds' ;
        }
        if (visited[row][col]) {
            return 'Sadly the horse is doomed in ' + move +' jumps';
        }


        sum += Math.pow(2,row) - col;
        move += 1;
        visited[row][col] = true;

        var dir = moves[row][col];
        //console.log(moves[row][col]);
        var goTo = getMovement(dir);
        row += goTo.row;
        col += goTo.col;

    }
}