Expedition

function expedition(primary, secondary, overlay, start) {
    for (let i = 0; i < overlay.length; i++) {
        let [pointX, pointY] = overlay[i];
        for (let j = 0; j < primary.length; j++) {
            for (let k = 0; k < primary[j].length; k++) {
                if (j >= secondary.length || k >= secondary[j].length || j + pointX >= primary.length || k + pointY >= primary[j].length) {
                    break;
                }
                let current = primary[j + pointX][k + pointY];
                let modifier = secondary[j][k];
                if (modifier === 1) {
                    if (current === 0) {
                        primary[j + pointX][k + pointY] = 1;
                    }
                    else {
                        primary[j + pointX][k + pointY] = 0;
                    }
                }
            }
        }
    }

    let point = {x:start[0],y:start[1]};
    let counter = 1;
    primary[point.x][point.y]=1;

    while (true) {
        if (primary[point.x][point.y + 1] === 0) {
            point.y++;
            counter++;
            primary[point.x][point.y]=1;
            if (point.y === primary[0].length - 1) {
                break;
            }
            continue;
        }

        if (primary[point.x + 1][point.y] === 0) {
            point.x++;
            counter++;
            primary[point.x][point.y]=1;
            if (point.x === primary.length - 1) {
                break;
            }
            continue;
        }

        if (primary[point.x][point.y - 1] === 0) {
            point.y--;
            counter++;
            primary[point.x][point.y]=1;
            if (point.y === 0) {
                break;
            }
            continue;
        }

        if (primary[point.x - 1][point.y] === 0) {
            point.x--;
            counter++;
            primary[point.x][point.y]=1;
            if (point.x === 0) {
                break;
            }
            continue;
        }

        break;

    }
    //console.log(primary);
    console.log(counter);

    function calculate(point) {
        let x = point.x;
        let y = point.y;

        if (x < primary.length / 2) {
            if (y < primary[0].length / 2) {
                return 2;
            }
        else {
                return 1;
            }
        }
        else    {
            if (y < primary[0].length / 2) {
                return 3;
            }
            else {
                return 4;
            }
        }
    }

    if (point.x === primary.length - 1) {
        console.log('Bottom');
    }
    else if (point.y === primary[0].length) {
        console.log('Right');
    }
    else if (point.x === 0) {
        console.log('Top');
    }
    else if (point.y === 0) {
        console.log('Left');
    }
    else{
        let quadrant = calculate(point);
        console.log(`Dead end ${quadrant}`);
    }


}