fkowal

Since macOS Catalina, the root drive is read-only. The solution is to create a separate APFS volume and a “synthetic” /nix directory which points to it:

# Check if /nix exists, if not:
echo 'nix' | sudo tee -a /etc/synthetic.conf
# this will create a "synthetic" empty directory /nix

# REBOOT so macOS sees the synthetic directory

# After rebooting, create an APFS volume for Nix

fkowal

object test {
  import scalaz.zio._

  type UserID = String
  case class UserProfile(name: String)

  // The database module:
  trait Database {
    val database: Database.Service

fkowal

VS Code Plugins and configuration tips

https://code.visualstudio.com/docs/setup/setup-overview

Plugins

• Project manager https://marketplace.visualstudio.com/items?itemName=alefragnani.project-manager
• Scala metals https://marketplace.visualstudio.com/items?itemName=scalameta.metals

fkowal

/*
 * Copyright 2015 Marconi Lanna
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software

fkowal

package ahoy

import scala.collection.mutable


object transducer {

  type Reducer[A, R] = R => A => R

  trait Transducer[A, B] {