lancewalton

import com.raquo.laminar.api.L.*
import org.scalajs.dom.{HTMLOptionElement, html}
 
object HTMLSelect {
  def signalRequiredSelect[T](options: Signal[List[T]], toValue: T => String, toText: T => String, controlledSelection: Signal[T], userSelection: WriteBus[T]): HtmlElement = {
    select(
      children <--
        options
          .split(toValue) { case (v, _, updates) =>
            option(

lancewalton

import com.raquo.laminar.api.L.*
import munit.FunSuite

import scala.collection.mutable

case class Foo(s: String)
case class Bar(s: String)

object Interpreter {
  def interpret(foo: Foo): EventStream[Bar]                       = EventStream.fromValue(Bar(foo.s))

lancewalton

// Is there a way to do this such that we don't end up with List[Thing[_]],
// but instead end up with something with the types preserved?
object Foo {
  sealed trait Thing[T]
  case class IntThing(i: Int) extends Thing[Int]
  case class StringThing(s: String) extends Thing[String]
  case class DoubleThing(d: Double) extends Thing[Double]

  // The implementation here is only to get a compile
  def differentThingsKnownOnlyAtRuntime(i: Int): Thing[_] = i match {

lancewalton

// Eda and I are using Free. We have a need to handle situations where the right hand side of the for comprehension produces
// an Either and Left means that we need to 'branch' to do something to handle the failure, but handling the failure
// will not result in something that allows the rest of the main program to continue - we still want it to short circuit.
// The branch is itself a Free program, so whatever mechanism is uses needs to put the result of the branch onto the
// Left so that the main program still short circuits.
//
// Question: Is this completely the wrong way to think about this?
//
// If not, I found this: https://gist.github.com/EECOLOR/c312bdf54039a42a3058
//

lancewalton

We need a questionnaire model that can:
* Support different answer types
* Support validations that can depend on the answers to other questions
* Support different forms of rendering (e.g. the questionnaire needs to be renderered using HTML, JSON, etc.) with / without the answers
* Answers need to be persisted and recovered from persistence. JSON persistence is acceptable.
* Support having conditional parts of the questionnaire based on previous answers

Needless to say, it must be typesafe

Different types of answers are things like: Dates, Addresses, Lists of Addresses, Phone Numbers, Lists of Phone Numbers, Strings, Enumerated values, etc.

lancewalton

case class Document(id: String, contentType: String, content: Array[Byte])

object Server {
  def apply() = {
    val service = HttpService {
      case req @ POST -> Root / "document" / id => upload(req, id)
    }
    
    JettyBuilder
      .bindHttp(8080)

lancewalton

package foo

object Foo extends App {
  case class Tree(label: String, children: List[Tree])
  
  trait Show[T] {
    def show(t: T): String
  }
  
  implicit def listShow[T : Show]() = new Show[List[T]]{

lancewalton

#!/bin/zsh

# For Macs, get gource with HomeBrew:
#   brew install gource
#   brew install ffmpeg

if (( !($# == 3) ))
then
    echo "Usage:"
    echo $0 "<gravatar directory> <output file base name> <seconds per day>"

lancewalton

import scala.collection.mutable

import rx.lang.scala.{Observable, Subscriber, Subscription}

// This is here to let us construct an Observable that we can 'tell' of new events.
case class SimpleObservable[T](initial: Option[T] = None) {
  private val subscribers: mutable.HashSet[Subscriber[T]] = new mutable.HashSet[Subscriber[T]] with mutable.SynchronizedSet[Subscriber[T]]
  private var lastValue: Option[T] = initial

  val observable = Observable { (subscriber: Subscriber[T]) =>

lancewalton

package chess

// Everything from this line down to the cut is common to the 'unoptimised' and 'optimised' solutions

case class Location(row: Int, column: Int)

trait Piece {
  def canAttackLocation(from: Location, to: Location): Boolean
}
case object Rook extends Piece {