havenwood

COUNTRY_LETTERS = 'A'.upto('Z').with_index(127462).to_h.freeze

def country_emoji(iso)
  COUNTRY_LETTERS.values_at(*iso.chars).pack('U*')
end

country_emoji('GB')
#=> "🇬🇧"

havenwood

require_relative 'tuple_space'

class Cache
  def initialize
    @memory = TupleSpace.new(reaper_period_in_secs: 10, expires_in_secs: 60)
  end

  def get(request)
    @memory[request]
  end

havenwood

class Xco
  attr_accessor :reaper

  def initialize
    @reaper = Automaton.new self
    @reaper.start
  end

  class Automaton
    def initialize(source, function: :reap, interval: 1)

havenwood

require 'fiber'

module Clock
  DEFAULT_SECONDS = 4

  module_function

  def run seconds: DEFAULT_SECONDS
    timer.resume tick, tock, seconds: seconds
  end

ljharb

Array Iteration

https://gist.github.com/ljharb/58faf1cfcb4e6808f74aae4ef7944cff

While attempting to explain JavaScript's reduce method on arrays, conceptually, I came up with the following - hopefully it's helpful; happy to tweak it if anyone has suggestions.

Intro

JavaScript Arrays have lots of built in methods on their prototype. Some of them mutate - ie, they change the underlying array in-place. Luckily, most of them do not - they instead return an entirely distinct array. Since arrays are conceptually a contiguous list of items, it helps code clarity and maintainability a lot to be able to operate on them in a "functional" way. (I'll also insist on referring to an array as a "list" - although in some languages, List is a native data type, in JS and this post, I'm referring to the concept. Everywhere I use the word "list" you can assume I'm talking about a JS Array) This means, to perform a single operation on the list as a whole ("atomically"), and to return a new list - thus making it mu

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname