vlingo/xoom-common

Completes with map and flatmap

sharmapankaj2512 opened this issue · 5 comments

sharmapankaj2512 commented

Thanks for the wonderful vlingo-actors library :)

At present I am trying to port my pet project to vlingo platform. In one of my usecases, I want to be able to do something like Completes<Int> to Completes<String>. Completes as of now doesn't support map/flatmap. From the Completes interface I understand I could use andThenTo.

It would be really awesome if Completes interface makes this a little easier, do you have any plans to add map/flatmap?

VaughnVernon commented

Hi @sharmapankaj2512 Maybe. TBF, flatMap() is only easier to reason about if you are already FP efficient. I think you will find that andThen() and andThenTo() to be intuitive. We are lacking some docs, but to make it clear:

andThen() - Pipe the Completes outcome to the registered synchronous filter Function
andThenTo() - Pipe the Completes outcome to the registered asynchronous filter Function that passes the outcome as parameter to an Actor via message send.

Makes sense?

sharmapankaj2512 commented

Yes, it does. andThenTo is what I am looking for, need to change the way I am thinking. Thanks :-)

VaughnVernon commented

@sharmapankaj2512 It's ok if you think flatMap() when using a FP language. We want developers to feel comfortable with monadic expressions in vlingo-* without knowing the word monad or its meaning. Thanks for accepting our suggested API :)

sharmapankaj2512 commented

After playing with Completes for a while, I feel the existing API is good enough as it guides towards proper usage of the actors. I am closing the issue, thanks you so much for the explanation :)