Wow, Much Recursion, So Rain

var createMatrix = function(w,h,r) {
        var matrix = new Array(h);
        for(var i=0;i<h;i++){
                matrix[i] = new Array(w);
                for(var j=0;j<w;j++) {
                        matrix[i][j] = r;
                }
        }
        return matrix;
}

var print2dArray = function(array)
{
        for(var y = 0;y < array.length ; y++) {
                var line = "";
                for(var x=0;x<array[y].length;x++) {
                        line = line + array[y][x];
                }
                console.log(line);
        }
}


var get_water_volume = function(island)
{
    var sizeX = island[0].length;
    var sizeY = island.length;

    var newIsland = Array(sizeY);
    for(var i=0;i<sizeY ;i++){
                newIsland[i] = new Array(sizeX);
                for(var j=0;j<sizeX;j++) {
                        newIsland [i][j] = island[i][j];
                }
        }


    var getHeight = function(x,y) {
        if( x<0 || x >= sizeX || y<0 || y >= sizeY) {
            return 0;
        }
        else {
            return newIsland[y][x];
        }
    }

    var getOldHeight = function(x,y) {
        if( x<0 || x >= sizeX || y<0 || y >= sizeY) {
            return 0;
        }
        else {
            return island[y][x];
        }
    }


    var setHeight = function(x,y,value) {
        if( x<0 || x >= sizeX || y<0 || y >= sizeY)
                    return;
        newIsland[y][x] = value;
    }

    var raindrop = function(x,y,height,waterMatrix) {
        if( x<0 || x >= sizeX || y<0 || y >= sizeY)
                    return false;
        var current = getHeight(x,y);
        var waterApplyed = waterMatrix[y][x] > 0;
        if(waterApplyed || current >= height)
            return true;
        waterMatrix[y][x] = 1;
        var right = raindrop(x + 1,y,height,waterMatrix);
        var left = raindrop(x - 1,y,height,waterMatrix);
        var top = raindrop(x,y - 1,height,waterMatrix);
        var bottom = raindrop(x,y + 1,height,waterMatrix);
        return  right && left && top && bottom;
    }

    var rain = function(x,y,height) {
        var matrix = createMatrix(sizeX,sizeY,0);
        if(raindrop(x,y,height,matrix)){
            for(var _x=0;_x<sizeX;_x++)
                    for(var _y=0;_y<sizeY;_y++)
                if(matrix[_y][_x] > 0)
                                setHeight(_x,_y,height);
        }

    }

    for(var x=1;x<sizeX-1;x++)
    for(var y=1;y<sizeY-1;y++) {
        var current = getHeight(x,y);
        var left = getHeight(x-1,y);
        var right = getHeight(x+1,y);
        var top = getHeight(x,y-1);
        var bottom = getHeight(x,y+1);
        if(left>current)
            rain(x,y,left);
        if(right>current)
                    rain(x,y,right);
        if(top>current)
                    rain(x,y,top);
        if(bottom>current)
                    rain(x,y,bottom);

    }
    var volume = 0;
    for(var x=0;x<sizeX;x++)
    for(var y=0;y<sizeY;y++) {
        volume += getHeight(x,y) - getOldHeight(x,y);
    }
    return(volume);

}

var island = [
[5,3,4,5],
[6,2,1,4],
[3,1,1,4],
[8,5,4,3]
];

console.log(get_water_volume(island)); //node js