ondrej-tucek

require Integer

collatz = fn                                      
  n when Integer.is_even(n) -> div(n, 2)             
  n when Integer.is_odd(n) -> 3*n + 1               
end   

n = 27
Stream.iterate(n, &collatz.(&1)) |> Enum.take(10)

ondrej-tucek

some tools for diagrams in software documentation

Diagrams For Documentation

Obvious Choices

• Graphviz
• Pandoc

ASCII

ondrej-tucek

defmodule Map.Helpers do
  @moduledoc """
  Functions to transform maps
  """

  @doc """
  Convert map string camelCase keys to underscore_keys
  """
  def underscore_keys(nil), do: nil

ondrej-tucek

Install RabbitMQ on Ubuntu 16.04

Install Erlang

wget https://packages.erlang-solutions.com/erlang-solutions_1.0_all.deb
sudo dpkg -i erlang-solutions_1.0_all.deb
sudo apt-get update -y
sudo apt-get install -y erlang erlang-nox

ondrej-tucek

DROP FUNCTION if exists aggregate_data(tbl_from text, tbl_to text);

CREATE OR REPLACE FUNCTION aggregate_data(tbl_from text, tbl_to text) RETURNS void AS $$
DECLARE
  parsed_time text = split_part(tbl_to, 'agg_', 2);
  time_val text;
BEGIN
  CASE parsed_time
    WHEN '1m' THEN
      time_val = '1 minute';

ondrej-tucek

[fl, sl, v] =
  [1, 2, 3, 4, 5, 6, 7, 8, 9]
  |> Enum.with_index()
  |> Enum.reduce([], fn
    {v, idx}, acc when idx < 4 -> [v | acc]
    {v, idx}, acc when idx == 4 -> [[], acc | [v]]
    {v, idx}, [hd | tl] when idx > 4 -> [[v | hd] | tl]
  end)
 

ondrej-tucek

{
   "location": {
      "woeid": 2502265,
      "city": "Sunnyvale",
      "region": " CA",
      "country": "United States",
      "lat": 37.371609,
      "long": -122.038254,
      "timezone_id": "America/Los_Angeles"
   },

ondrej-tucek

Guide to setting up InfluxData's TICK stack

InfluxData's T.I.C.K. stack is made up from the following components:

Component	Role
Telegraf	Data collector
InfluxDB	Stores data
Chronograf	Visualizer

ondrej-tucek

module Models.Language exposing (..)

import Json.Decode exposing (int, string, decodeString, Decoder)
import Json.Decode.Pipeline exposing (decode, required)


type alias Language =
    { id : Int
    , name : String
    , label : String

ondrej-tucek

Using Git

Global Settings

Related Setup: https://gist.github.com/hofmannsven/6814278

Related Pro Tips: https://ochronus.com/git-tips-from-the-trenches/