Stream: fhirpath
Topic: Summing a collection?
Paul Lynch (Aug 09 2018 at 22:35):
If I have a collection of numbers, is there a way to sum them?
Grahame Grieve (Aug 09 2018 at 23:45):
using the aggregator. And note that we defined sum() in the questionnaire stuff as an extension - see http://www.healthintersections.com.au/?p=2835
Paul Lynch (Aug 10 2018 at 15:10):
I saw a mention of an "aggregator" but I could not find anything about it in the FHIRPath spec at http://hl7.org/fhirpath/. Is it someplace else?
nicola (RIO/SS) (Aug 10 2018 at 16:12):
i think, we have to use github version!?
Paul Lynch (Aug 10 2018 at 17:14):
I found it here: http://hl7.org/fhirpath/2018May/index.html#aggregate-aggregator-expression-init-value-value, which is labeled as 1.1 of FHIRPath and "STU2 Ballot". I am not sure when the voting on that "ballot" will happen, but I would guess we can go ahead and add "aggregator".
nicola (RIO/SS) (Aug 11 2018 at 20:16):
@Bryn Rhodes and @Grahame Grieve can you clarify what means to evaluates to true and evaluates to false - [true] and [false] ?
nicola (RIO/SS) (Aug 11 2018 at 20:20):
And what function not() should do, if it is passed for example collection of integers? Throws exception?
nicola (RIO/SS) (Aug 11 2018 at 20:22):
What the real reason to have this ternary logic?
nicola (RIO/SS) (Aug 11 2018 at 20:33):
I like list and maybe functors, but may be everything is a collection brings strange semantic to simple things like if and not + - etc and we still have errors in runtime :(
Grahame Grieve (Aug 14 2018 at 01:24):
I thought the spec was pretty clear about this....
Last updated: Apr 12 2022 at 19:14 UTC
