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Java 8 Lambdas: Functional Programming For The Masses
Author: Richard Warburton
Avaliable on Amazon
@zlakad I read before a nice book I would suggest to read it It explain how flatMap and every this how its work with an intelligent way the book is [Java 8 Lambdas](https://www.amazon.com/Java-Lambdas-Functional-Programming-Masses/dp/1449370772) hope this can help you ;)
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