Comparing vertex properties in Gremlin Groovy - groovy

Question

I'm asking nearly the same question as you see here, but with the constraint that the groovy, not java, syntax must be used. Ideally the answer to would be very concise.
I have a simple graph of people vertices. Each has an "age" property listing that person's age in years. There are also "worksFor" labeled edges connecting pairs of people vertices. I'd like to see all edges where the people at both ends of the edge have the same age property.
I'd then like a similar query where the two ages differ by less than 3 years.
As mentioned, this should be in groovy, not Java, syntax. Gremlin 3 is preferred, but Gremlin 2 answers are acceptable.

Answer 1

all edges where the people at both ends of the edge have the same age property
g.V().as("a").outE("worksFor").as("e").inV().as("b").select("a","b").by("age").
where("a", eq("b")).select("e")
where the two ages differ by less than 3 years
g.V().as("a").outE("worksFor").as("e").inV().as("b").select("a","b").by("age").
filter {Math.abs(it.get().get("a") - it.get().get("b")) < 3}.select("e")

Answer 2

If we know the target vertex against which all other vertices are compared, the following may work:
t=g.V().has('id', 'target_node_id').values('age').next()
g.V().has('age').filter{it.get().value('age')-t<=3 && it.get().value('age')-t>=-3}
I don't know how to do it in one query. I also don't know if there is a function/step to get the absolute value.
This only partially satisfies your need, but it may be a start.

Answer 3

Comparing two date properties using math step:
g.V().hasLabel('EnterExitDate').limit(10000).as('enter','exit')
.where("enter",lt("exit")).by('enter').by('exit')
.where(math('(exit - enter) / (3600*1000) ')
.by(values('exit').map({ it.get().time }))
.by(values('enter').map({ it.get().time }))
.is(lt(1)))
.valueMap()
This query will find all pairs of enter-exit record of employees that have happened within 1 hour.
EnterExitDate class:
public class EnterExitDate {
private Date enter;
private Date exit;
// getters and setters...
}