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View NewReactor.swift
import Foundation
import Actor
import MessageRouter
public final class Core<State, Event, Command> {
public typealias CommandProcessor = (Core<State, Event, Command>, Command) -> Void
public typealias EventHandler = (State, Event) -> CoreUpdate<State, Command>
public let stateChanged = MessageRouter<State>()
rob-brown / SecretMessage.exs
Last active Jan 14, 2018
Encode secret messages into text using zero-width spaces
View SecretMessage.exs
defmodule SecretMessage do
@zero "\u200C"
@one "\u200D"
def encode(text, secret) when byte_size(text) > byte_size(secret) do
|> obfuscate
|> Stream.concat(Stream.repeatedly fn -> "" end)
|> text)
rob-brown / Actor.swift
Last active Mar 8, 2018
Elixir-inspired concurrency primitives
View Actor.swift
// Actor.Swift
// Copyright (c) 2017 Robert Brown
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
View ziplist.ex
defmodule ZipList do
defstruct previous: [], current: nil, remaining: []
def from_list(list, index \\ 0)
def from_list([], _), do: {:error, :empty_list}
def from_list(list, index) when length(list) < index, do: {:error, :index_out_of_bounds}
def from_list(list, index) when is_list(list) do
previous = list |> Enum.take(index) |> Enum.reverse
[current | remaining] = Enum.drop list, index
ziplist = %__MODULE__{previous: previous, current: current, remaining: remaining}
rob-brown / stage_inspector.ex
Last active Aug 18, 2016
Inspect the data passed between GenStages.
View stage_inspector.ex
defmodule StageInspector do
alias Experimental.{GenStage}
use GenStage
def init(type) when type in [:consumer, :producer_consumer] do
{type, type}
def handle_events(events, _from, state = :consumer) do
Enum.each events, &inspect_event/1
rob-brown / ObjectsFromFunctions.swift
Last active Jun 8, 2017
Use Church Encoding to create objects using only functions
View ObjectsFromFunctions.swift
//: Playground - noun: a place where people can play
import UIKit
// ----------------------------
// Create the "object".
// Basically it's a dispatch table.
typealias Person = (String) -> Any
var PersonInit: ((String, String) -> Person)!
rob-brown / life.ex
Last active Aug 29, 2015
Conway's Game of Life
View life.ex
defmodule Life do
# Defaults to B3/S23
defstruct cells: [[]], born: [3], stays: [2, 3], width: 10, height: 10, step: 0
def run(file) do
file |> read_file |> loop
def loop(life) do
rob-brown / mastermind.ex
Last active Aug 29, 2015
A Mastermind game implemented in Elixir.
View mastermind.ex
defmodule Mastermind do
defstruct rounds: 10, choices: 6, answer: nil, guesses: []
def start, do: game_loop %Mastermind{}
defp game_loop(game = %Mastermind{answer: nil}) do
|> start_computer_mastermind
|> game_loop
rob-brown / simulator.exs
Last active Aug 29, 2015
Simulator/App Finder
View simulator.exs
defmodule Simulator do
defstruct name: "", version: "", directory: ""
# Uses the home directory to find the devices directory.
case :init.get_argument(:home) do
{:ok, [[dir]]} ->
@simulator_dir :filename.join [dir, "Library", "Developer", "CoreSimulator", "Devices"]
_ ->
IO.puts "Unable to find the home directory."
View gist:901aacabd9709cda1eb8
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