Goshko The Rabbit (JS Exam)

function solve(args) {
    var veggies = {
        '{&}' : 0,
        '{*}' : 0,
        '{#}' : 0,
        '{!}' : 0,
    };
    var visitedCells = [];
    var directions = args[0].split(', ');
    var wallHits = 0;
    var veggiesFound = false;
    var matrix = [];
    var cellsPassed = false;
    for (var i = 0, j = 1; i < args.length - 1; i++, j++) {
        matrix[i] = args[j].split(', ');
    }
    var concatArr = [];
    var keys = Object.keys(veggies);
    var currentRow = 0;
    var currentCol = 0;
    for (var dir in directions) {
        var hitWall = false;
        if (directions[dir] === 'up') {
            if (currentRow === 0) {
                wallHits++;
                hitWall = true;
            }
            else {
                currentRow--;
                cellsPassed = true;
            }
        }
        else if (directions[dir] === 'down') {
            if (currentRow === matrix.length - 1) {
                wallHits++;
                hitWall = true;
            }
            else {
                currentRow++;
                cellsPassed = true;
            }
        }
        else if (directions[dir] === 'left') {
            if (currentCol === 0) {
                wallHits++;
                hitWall = true;
            }
            else {
                currentCol--;
                cellsPassed = true;
            }
        }
        else if (directions[dir] === 'right') {
            if (currentCol === matrix[0].length - 1) {
                wallHits++;
                hitWall = true;
            }
            else {
                currentCol++;
                cellsPassed = true;
            }
        }
        var tempStr = matrix[currentRow][currentCol];
        if (visitedCells.indexOf(currentRow + '' + currentCol) < 0) {
            visitedCells.push(currentRow + '' + currentCol);
            for (var key in keys) {
                if (tempStr.indexOf(keys[key]) > -1 && hitWall === false) {
                    veggies[keys[key]] += 1;
                    veggiesFound = true;
                    tempStr = tempStr.replace(keys[key], '@');
                }
            }
            concatArr.push(tempStr);
        }
    }
    var finalPart;
    if (cellsPassed === false) {
        finalPart = 'no';
    }
    else {
        finalPart = concatArr.join('|');
    }
    var finalStr = JSON.stringify(veggies).replace('{*}','*').replace('{&}','&').replace('{#}','#').replace('{!}','!').replace('}', '') +
                    ',\"wall hits\":' + wallHits + '}\n' + finalPart;
    console.log(finalStr);
}