mariussoutier

;; msoutier's solution to Replicate a Sequence
;; https://4clojure.com/problem/33

(fn [c n] (mapcat #(repeat n %) c))

mariussoutier

;; msoutier's solution to Interpose a Seq
;; https://4clojure.com/problem/40

(fn [s c] (butlast (mapcat #(list %1 s) c)))

mariussoutier

package keeponlyalive

/** A cell that exists is alive */
case class Cell(x: Int, y: Int) {
  def survives(implicit world: Set[Cell]) = neighborCount(world) match {
    case 2 => true
    case 3 => true
    case _ => false
  }
  

mariussoutier

;;; Conway's Game of Life
;;; Using a set of coordinates to provide a infinite world
;;;
;;; Moritz Ulrich <ulrich.moritz@googlemail.com>
;;; Cologne Clojure User Group
;;; November 17, 2011

(ns game-of-life.core
  (:use [clojure.set :as set]))

mariussoutier

UserDAO.findByEmail(email).map { user =>
  Ok(views.html.edit(userForm.fill(user)))
}.getOrElse(NotFound("User not found!"))

mariussoutier

package views.html.helper

import play.api.templates.Html

object repeatWithIndex {
  def apply(field: play.api.data.Field, min: Int = 1)(f: (play.api.data.Field, Int) => Html) = {
    (0 until math.max(if (field.indexes.isEmpty) 0 else field.indexes.max + 1, min)).map(i => f(field("[" + i + "]"), i))
  }
}

mariussoutier

package views.html.helper

import play.api.templates.Html

object definingNonEmpty {
  def apply[T <: Seq[_]](t: T)(block: (T) => Html) = {
    if (t.nonEmpty) block(t) else Html("")
  }
}

mariussoutier

package views.html.helper

import play.api.templates.Html

// Executes the first block if non-empty, the second otherwise
// Passes the entire seq (as in defining)
object ifEmptyOrElse {
  def apply[T <: Seq[_]](t: T)(nonEmptyBlock: (T) => Html)(emptyBlock: => Html) = {
    if (t.nonEmpty) nonEmptyBlock(t) else emptyBlock
  }

mariussoutier

# Map to language via RegEx
/$language<[a-z]{2}>/videos/:id   controllers.Video.showVideo(id: Long, language: String)
# Hard-code supported languages
/de/videos/:id   controllers.Video.showVideo(id: Long, language = "de")
/en/videos/:id   controllers.Video.showVideo(id: Long, language = "en")

mariussoutier

// Adding new functionality via inheritance leads to combinatorial explanation

abstract class Serializer {
  def write(string: String): Unit
}

class CsvFileWriter extends FileWriter {
  def writeFile(file: java.io.File) = //...
}