How to check the node/vertex/Edge is present in the Graph using Gremlin

Question

How to check the node/vertex or edge is present in the Graph using the Gremlin query?

Answer 1

To check the node/Vertex

   //Returns True or False
   g.V('id').hasNext()

To check the edge

 //Returns True or False
 g.V('id).bothE().hasNext();