1. Functional Programming in Scala - Gaoey/scala-diary GitHub Wiki

functional programming is a restriction on how we write programs, but not on what programs we can express. That's mean How we write programming without side effects or - we construct our programs using only pure functions

side effect is does something in the function other than simply return exact results Example: perform I/O, handle errors, and modify data.

Benefit

• Modularity - effective of pure function -> easy to test, reuse, parallelize and less bug

Fundamental

• Pure Function
• Tail Recursion
• Higher Order Function
• Curry Function
• Partially Applied Functions
• Anonymous Function
• Type in Scala
• Functor, Monoid and Monad
• Inheritance
• Polymorphism
• Error Handling

Functional Data Structure

• Pattern Matching
• Trees

Other

• Circe - Json API