provide degree of vertex

[SteamShon]

degree of a vertex of a graph is the number of edges incident to the vertex.

It could be possible to store vertex degree and label information that this vertex participated while we mutate edge.

It would be very nice to provide vertex degree and what label this vertex has edges.

[SteamShon]

now when user get edges with offset 0, limit n, then return total size of edges as degree + n edges