async-done.node.txt

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   ASYNC-DONE  
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VERSION ==>                       #2.0.0
                                  #Abstraction over different ways for a function to be async

ASYNC-DONE(FUNC, FUNC2(ERROR,VAL))#Fires FUNC() right away (with no arguments except potential callback FUNC3).
                                  #FUNC can:
                                  #  - throw an ERROR
                                  #  - return PROMISE: error is PROMISE rejected
                                  #  - use callback FUNC3([ERROR])
                                  #  - return STREAM|EVENTEMITTER|REQ|RES|CHILD_PROCESS: using END-OF-STREAM (see its doc)
                                  #  - return OBSERVABLE: using OBSERVABLE.subscribe()
                                  #FUNC cannot be sync, i.e. it must be async.