What is "effect" or "effectful" mean in Functional Programming?

Hint - it is not side effect

Algebraic Data Types and Its Generic Presentation In Scala

2 Ways to represent product and coproduct in Scala

How to Write Data Processing Application in FS2

Processing Application with Stream

How to Write a Simple Data Processing Application With Akka Actors

Processing data concurrently with Actor System

All you need to know about SQS and Kinesis is Here

Identify each resources can help you design a reliable system, and save your resources time and money

How To Test Code With Side Effect In A Pure Way In Scala

Abstracting out into Type Constructor to make code test simpler

All You Want To Know About The Concept Of Immutable Server Is Here

It used to not be immutable because the cost are high

How to run Future Traverse that has Side Effect

Solving parallel programming problems

How To Implement Functional List In Scala

How to implement functional data structure in Scala

3 Useful Things About Either That You Want To Know

Either helps you construct better error handling