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Author: Hannes Petri

RxJS: invoke two async calls, return the first that passes a condition, or a special value of none of them does

Using RxJS, I want to invoke two different asynchronous operations, which may or may not return null. They may also take indefinite time to complete. I want to achieve the following: If operation A returns value 1, then immediately return value 1 If operation B returns value 2, then immediately return value 2 If both operation A and B return null, then return null. I suppose I can achieve the first two simply as follows: […]