thobson

import { Entity } from "electrodb";
import { client, table } from "../client";

export const UserEntity = new Entity(
  {
    model: {
      version: "1",
      entity: "user",
      service: "default",
    },

thobson

# Error
➜  ~ brew upgrade
Updating Homebrew...
==> Auto-updated Homebrew!
Updated Homebrew from e98a91378 to 4c8fe984c.
Updated 2 taps (homebrew/core and homebrew/cask).
==> New Formulae
dasel
Error: undefined method `ohai_stdout_or_stderr' for #<ReporterHub:0x00007fd88a968308>
Please report this issue:

thobson

package com.example

import java.text.NumberFormat
import java.time.Instant

import cats.effect.{IO, Sync, Timer}
import fs2.{Chunk, Stream}
import monix.eval.Task
import monix.execution.Scheduler
import monix.reactive.Observable

thobson

class TableManager[F[_]](guard: Semaphore[F],)(implicit F: Sync[F], TableOps: TableOps[F]) {

  // this feels hacky
  private val state = mutable.Map.empty[String, Table]

  def tableFor(name: String, createIfMissing: Boolean): F[Table] = guard.withPermit {
    state.get(name) match {
      case Some(table) => table.pure[F]
      case None => for {
        newTable <- TableOps.open(buildPath(name), createIfMissing)

thobson

implicit val vehicleLikeTank = new VehicleLike[Tank] {
  def drive: String = "driving a big big tank"
}

val tank = Tank(...)
val drivenTank: Tank = Dealership.driveAndReturn(tank)

thobson

import Vehicles._ // import car and bus implementations

val ford = Car("ford")
Dealership.driveAndReturn(ford) // vehicleLikeCar is already in scope due to the import

thobson

trait VehicleLike[A] {
  def drive(a: A): String
}

object Vehicles {
  implicit val vehicleLikeCar = ...  
  implicit val vehicleLikeBus = ...
}

object Dealership {

thobson

val ford: Car = Car("ford")
// still a Car
val drivenFord: Car = driveAndReturn(ford) 

thobson

implicit val vehicleLikeCar = ...
implicit val vehicleLikeBus = ...

def driveAndReturn[A](vehicle: A)(implicit vehicleLike: VehicleLike[A]): A = {
  println(vehicleLike.drive(vehicle)); vehicle
}

thobson

val ford = Car("ford")
val londonBus = Bus("red")
println(vehicleLikeCar.drive(ford))
println(vehicleLikeBus.drive(londonBus))