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Rich Hickey

Rich is the BDFL of Clojure. He's a great speaker with lots of ideas to offer concerning problem solving and separating time, state, value, and identity. His thoughts on these things influenced the design of Clojure and Datomic (an immutable database that supports time-travel).

All of his talks are good but here are a few to start with:

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import com.typesafe.config.{Config, ConfigException, ConfigFactory}
import java.time.{Duration => JDuration}
import scala.collection.JavaConverters._
import scala.reflect.ClassTag
import scala.util.Try

object config {
  class ConfigOps(config: Config) {
    def booleanOption(path: String): Option[Boolean] = 
      if (config.hasPath(path)) Some(config.getBoolean(path)) else None

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import sbt._

object FixScalacOptionsInConsole extends AutoPlugin {
  import Keys._

  override def requires = plugins.JvmPlugin
  override def trigger = allRequirements

  override lazy val projectSettings = Seq(
    Compile / console / scalacOptions ~= filter,

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final object Luhn {
  /** An O(1) Map[Int, Int] of precomputed double values. */
  private[this] final val doubles = Array(0, 2, 4, 6, 8, 1, 3, 5, 7, 9)

  /**
   * Validate a card using the Luhn algorithm with a single pass through the string,
   * no other validation needed prior.
   *
   * Pure speed here (only 1 function call to get the byte array).
   */

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(defn parse-string
  "Parse a literal string, returning the [line col index] of the following character.

   start-ix should point to the first character inside the literal string, not the opening quote."
  [start-line start-col start-ix text]
  (loop [line start-line
         col  start-col
         ix   start-ix]
    (if (>= ix (.length text))

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sealed trait Tree[+A] {
  def value: A
  def children: Vector[Tree[A]]

  def get: Option[A]
  
  def isEmpty: Boolean
  final def nonEmpty: Boolean = !isEmpty

  def isLeaf: Boolean

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(defn element-with-id
  "Return the element with the given ID."
  [id]
  (js/document.getElementById id))


(defn resolve-element
  "Given an ID or a CSS selector or an element, return the first matching document element."
  [selector]
  (cond

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package actors

import akka.actor.{Actor, ActorLogging, Props}
import java.time.Instant
import scala.collection.immutable.TreeMap
import scala.concurrent.duration._

object TemporalCache extends ActorGenerator1[TemporalCache, FiniteDuration] {
  def props(checkExpiration: FiniteDuration = 60.seconds) =
      Props(new TemporalCache(checkExpiration))

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(ns interceptors.success
  (:require [re-frame.core :as rf]
            [clojure.string :as string]))


(defn success-or-failure
  "Tests whether an event keyword is a success or failure callback,
   and returns one of :success, :failure, or nil."
  [event]
  (cond

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/*------------------------------------------------------------------------------
 * MIT License
 * 
 * Copyright (c) 2017 Doug Kirk
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