gistfile1.txt

gremlin> g = TinkerGraph.open().traversal()
==>graphtraversalsource[tinkergraph[vertices:0 edges:0], standard]
gremlin> g.withSideEffect('onCreate', [name:'a', created: 123]).
......1>   withSideEffect('onMatch', [updated: 321]).
......2>   V().has('name','a').fold().
......3>   coalesce(unfold().as('v').sideEffect(select('onMatch').unfold().as('kv').
......4>                                        select('v').
......5>                                        property(select('kv').by(keys), select('kv').by(values))),
......6>            addV().as('v').sideEffect(select('onCreate').unfold().as('kv').
......7>                                      select('v').
......8>                                      property(select('kv').by(keys), select('kv').by(values))))
==>v[0]
gremlin> g.V().elementMap()
==>[id:0,label:vertex,created:123,name:a]
gremlin> g.withSideEffect('onCreate', [name:'a', created: 123]).
......1>   withSideEffect('onMatch', [updated: 321]).
......2>   V().has('name','a').fold().
......3>   coalesce(unfold().as('v').sideEffect(select('onMatch').unfold().as('kv').
......4>                                        select('v').
......5>                                        property(select('kv').by(keys), select('kv').by(values))),
......6>            addV().as('v').sideEffect(select('onCreate').unfold().as('kv').
......7>                                      select('v').
......8>                                      property(select('kv').by(keys), select('kv').by(values))))
==>v[0]
gremlin> g.V().elementMap()
==>[id:0,label:vertex,created:123,name:a,updated:321]