public default void ifPresent(final Consumer<? super V> consumer) {
        if (this.isPresent())
            consumer.accept(this.value());
    }
If the property is present, the consume the value as specified by the {@link Consumer}.

@param consumer The consumer to process the existing value.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/Property.java