Pragmatic Scala

Scala and functional programming for mortals.

Feb 24, 2018

Local Variable Propagation with Monix Part 1

I have been using monix for over a year and a half in the projects I have been involved with and it has proven to be a reliable tool for developing reactive applications due to the stack safety guarantees it provides and the simplicity it offers for…

Leandro Bolívar

Apr 11, 2016

Filter ops with Slick 3.1

I have been working with slick 3 for a while and the most recurring need I face is filtering queries with predicates that are defined by some optional values, these values often match the properties of the class that is used to map a slick table. For example, lets say I have a table…

Leandro Bolívar

Apr 5, 2016

Functional Programming, Simpler Unit Testing Part 3

In the previous part of the series (Functional Programming, Simpler Unit Testing Part 2) I illustrated how we can use mocks and stubs to handle tests for functions that depend on objects that produce side effects. Now we are going to take a…

Leandro Bolívar

Apr 5, 2016

Functional Programming, Simpler Unit Testing Part 2

In Functional Programming, Simpler Unit Testing Part 1 I illustrated how we can use higher order functions and function composition in order to deal with methods that produce side effects and how we can test our code more efficiently by…

Leandro Bolívar

Apr 5, 2016

Functional Programming, Simpler Unit Testing Part 1

From my experience in Scala, one of the most annoying things to do is to test methods that have inner calls to other private or public methods since there is no way to stub them or mock the objects that those methods use or produce. The…