use.groovy

class EnhancedVertex {
  static void setOrRemoveProperty(final Vertex self, final String property, final def value) {
    if (value == null) self.removeProperty(property) else self.setProperty(property, value)
  }
}

g = TinkerGraphFactory.createTinkerGraph()

use (EnhancedVertex) {
  marko = g.v(1)
  marko.setOrRemoveProperty("foo", "bar")
  marko.setOrRemoveProperty("name", null)
}

g.(1).map()

I had no idea you could do that. Thanks!