| 原著者: | Adrian Holovaty |
|---|---|
| 原文: | Why I left Heroku, and notes on my new AWS setup |
金曜日、私は Heroku から Amazon Web Services(AWS) を直接使うように Soundslice を移行しました。私はこの変更ができてとても、そうとても嬉しくて、私がどうやったかということと、もし皆さんが同じような立場だったら何故それを検討すべきかということについて広く伝えたいと思います。
halcat0x15a
/ Magma.scala
Last active
December 17, 2015 22:29
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| trait Magma[A] { | |
| def append(x: A, y: A): A | |
| } | |
| object Magma { | |
| implicit def Monoid[A](implicit m: Monoid[A]) = new Magma[A] { | |
| def append(x: A, y: A) = m.append(x, y) | |
| } | |
| } |
Gab-km
/ whyILeftHeroku.rst
Last active
December 30, 2022 10:56
何故私は Heroku から離れたか、および新しい AWS セットアップのメモ
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| // b88 にて、直接コマンドラインから javac と java を呼び出して動作を確認 | |
| import java.util.Optional; | |
| import java.util.function.Function; | |
| final class OptionalUtil{ | |
| public static <A, B> Optional<B> bind(Optional<A> o, Function<A, Optional<B>> f){ | |
| return o.isPresent() ? f.apply(o.get()) : Optional.empty(); | |
| } | |
| } |
色んなSQLをSquerylで書くと？ のパクリです。
テーブル名とかカラム名はちょっと弄りました。
SELECT *
xuwei-k
/ LazyEither.scala
Created
May 21, 2013 22:42
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| package scalaz | |
| /** [[scala.Either]], but with a value by name. */ | |
| sealed trait LazyEither[+A, +B] { | |
| import LazyEither._ | |
| def fold[X](left: (=> A) => X, right: (=> B) => X): X = | |
| this match { | |
| case LazyLeft(a) => left(a()) |
def cond[A](value: A)(f: PartialFunction[A, SQLBuilder => SQLBuilder]): SQLBuilderこんな感じの(実際にはSQLBuilderはサブクラス型にしないとだけど)あれば下みたいに書けるかなー
val id: Option[Int] = ...
val name: Option[String] = ...
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| sealed trait Maybe[+A] | |
| case class Just[+A](a: A) extends Maybe[A] | |
| case object Not extends Maybe[Nothing] | |
| sealed trait ConsList[+A]{ | |
| final def ::[AA >: A](h: AA): ConsList[AA] = Cons(h, this) | |
| final def :::[AA >: A](h: ConsList[AA]): ConsList[AA] = { | |
| def loop(other: ConsList[AA]): ConsList[AA] = other match{ | |
| case Cons(head, tail) => head :: loop(tail) | |
| case NIL => this |
!SLIDE
@markhibberd さんの Endo の話がわかりやすかったので、勝手に日本語の説明をつけたスライドを作った
halcat0x15a
/ bits.scala
Created
May 17, 2013 06:43
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| package bits | |
| import scala.language.experimental.macros | |
| import scala.reflect.macros.Context | |
| object Macros { | |
| def bits(n: Long) = macro impl | |
| def impl(c: Context)(n: c.Expr[Long]): c.Tree = { |