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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
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
@rob-brown
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
secret
|> obfuscate
|> Stream.concat(Stream.repeatedly fn -> "" end)
|> Stream.zip(String.codepoints text)
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>()
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