Stream: fhirpath
Topic: contains&in with empty collection
nicola (RIO/SS) (Sep 18 2018 at 03:25):
What result is expected if we do contains with empty collection?
Grahame Grieve (Sep 18 2018 at 11:14):
empty collection
John Grimes (Dec 19 2019 at 23:14):
From: https://hl7.org/fhirpath/2018Sep/index.html#in-membership
If the left-hand side of the operator is empty, the result is empty
What is the rationale for not returning false in this case? Then the implementation could rely on the fact that this operator always returns a Boolean (or throws an error), rather than having to also cover the case where it returns an empty collection.
Grahame Grieve (Dec 19 2019 at 23:18):
you could ask that about any operation.
Grahame Grieve (Dec 19 2019 at 23:18):
null inputs leads to null outputs
John Grimes (Dec 19 2019 at 23:20):
Ok, I will attempt to wrap my head around that
Last updated: Apr 12 2022 at 19:14 UTC
