In this post, we will see how to resolve How should I wrap this code correctly to use with Cats Effect 3? Should I use a resource? Question: Is the below code correct to work with cats effect and IO? ...
In this post, we will see how to resolve Implement Scala Cats Traverse for State Question: I’ve been writing my own version of Scala Cats (to assist others when learning this library). I’ve implemented my own versions of most type ...
In this post, we will see how to resolve What do the generic type constraints “:<:” and “:+:” mean in this Scala example? Question: From this talk about nanopass compilers in 2017 (https://github.com/sellout/recursion-scheme-talk/blob/master/nanopass-compiler-talk.org) I found the code snippet below. In ...
Question: I have 3 immutable maps and I want to merge them so the result is of type: What is the best way to do this. And by best I mean fewest lines of code. Answer: I think you need ...
Question: To analyze the performance issues with our ember-server, Trying to get the server metrics on prometheus using the document mentioned here: https://http4s.org/v0.23/middleware/ build.sbt Sample code: Getting compilation error at .withHttpApp(testRoute.orNotFound) which is expected but not sure of the solution. ...
Question: I need to implement the cats Show instances for an enum which express the basic operators. After reading the doc, I tried to implement as following: But I got the errors when trying to execute the show method: Is ...
Question: So I have a program in which I get a list of file paths from a database, delete those files on the filesystem and finally delete the file paths from the database. I put all operations inside a transaction ...