shawndumas

[0, ['a', 'b', 'c'], 2, 'd', 4, 5, 'f', 7, ['g', 'h'], 9].reduce(function rec (prev, curr) {
    if (/array/i.test(curr.constructor)) {
      return curr.reduce(rec, prev);
    } else if (/string/i.test(curr.constructor)) {
      prev.push(curr);
    }

    return prev;
  }, []);

sasa1977

# Works on Elixir 1.0.x
# Usage: just paste to `iex` shell, or run `elixir conway.ex`

defmodule Sum do
  defstruct value: 0

  def value(%Sum{value: value}), do: value

  def add(%Sum{value: value} = sum, x) do
    %Sum{sum | value: value + x}

bcobb

enum ConsPosition {
    case Left, Right
}

func cons<T>(a: T, b: T) -> (ConsPosition -> T) {
    func innerCons(i: ConsPosition) -> T {
        if i == .Left {
            return a;
        } else {
            return b;

evancz

Union Types

If Elm community is going to begin referring to "union types" instead of "algebraic data types" we should think about how that will work in practice. What discussions will we have? Will we find ourselves in awkward spots trying to explain things?

The following question/answer pairs simulate things I'd expect to see in a world of "union types". The pairs are grouped by what background I expect the questions to come from so we know the subtext. I have also added some meta comments in italic to explain my phrasing.

One thing to consider is that a lot of learners will not have a person to ask, so the path to arriving at these answers needs to be easy if you are just searching online.

General Questions

addyosmani

CSS Layout Debugger

A tweet-sized debugger for visualizing your CSS layouts. Outlines every DOM element on your page a random (valid) CSS hex color.

One-line version to paste in your DevTools

Use $$ if your browser aliases it:

~ 108 byte version

rubencaro

Elixir installation guide

Version numbers should be the ones you want. Here I do it with the last ones available at the moment of writing.

The simplest way to install elixir is using your package manager. Sadly, at the time of writing only Fedora shows the intention to keep its packages up to date. There you can simply sudo dnf install erlang elixir and you are good to go.

Anyway, if you intend to work with several versions of erlang or elixir at the same time, or you are tied to a specific version, you will need to compile it yourself. Then asdf is your best friend.

evancz

Architecture in Elm

This document is a collection of concepts and strategies to make large Elm projects modular and extensible.

We will start by thinking about the structure of signals in our program. Broadly speaking, your application state should live in one big foldp. You will probably merge a bunch of input signals into a single stream of updates. This sounds a bit crazy at first, but it is in the same ballpark as Om or Facebook's Flux. There are a couple major benefits to having a centralized home for your application state:

1. There is a single source of truth. Traditional approaches force you to write a decent amount of custom and error prone code to synchronize state between many different stateful components. (The state of this widget needs to be synced with the application state, which needs to be synced with some other widget, etc.) By placing all of your state in one location, you eliminate an entire class of bugs in which two components get into inconsistent states. We also think yo

cvrebert

Test apparatus: http://jsfiddle.net/hRub4/

(Windows = Windows 8.1 desktop)

• Windows Chrome 39
  • Button focuses on click and via keyboard tabbing
  • Anchor focuses on click and via keyboard tabbing
• Windows Firefox 30.0
  • Button focuses on click and via keyboard tabbing
  • Anchor focuses on click and via keyboard tabbing
• Windows Internet Explorer 11

theburningmonk

-- this defines a 'record', i.e. a lightweight labeled data structure
x = { age = 42, name = "Boke" }

-- you can use .label to access the value associated with the labels
x.age  -- 42
x.name -- "Boke"

-- you can also use .lable as a function to access the associated value from a record too
.age x  -- 42
.name x -- "Boke"

jeffjohnson9046

# To make this server publicly available on the inter-webs while running from localhost, use ngrok, which can be found here:
# https://ngrok.com/download.  Follow the installation instructions for ngrok and start it up:
#
#   ./ngrok 4567 # (or whatever port you want to listen on).
#
# ngrok will spit out an ugly but unique URL.  After ngrok starts up, you should be able to POST to the sinatra server:
#
#   http://6eee766f.ngrok.com/payload
require 'sinatra'
require 'json'