tute

A top-down look into Elixir (for Rubyists)

• Phoenix (as "Rails for Elixir")
  • Rails and Phoenix can get suspiciously similar
  • A code sample:
• controller.rb

davydovanton

require 'benchmark/ips'

array = (1..10_000).to_a

Benchmark.ips do |x|
  x.report('each_with_object') { array.each_with_object([]) { |i,a| a << (i * 2) } }
  x.report('map') { array.map { |i| i * 2 } }
  x.report('map!') { array.map! { |i| i * 2 } }
  x.report('reduse') { array.reduce([]) { |a,i| a << i * 2 } }
  x.compare!

mdang

Ruby on Rails Cheatsheet

Architecture

Create a new application

Install the Rails gem if you haven't done so before

Phlow

{% comment %}
*
*  This loop loops through a collection called `collection_name`
*  and sorts it by the front matter variable `date` and than filters
*  the collection with `reverse` in reverse order
*
*  To make it work you first have to assign the data to a new string
*  called `sorted`.
*
{% endcomment %}

rachelhyman

To create anchor links that jump down to different sections of a README (as in an interactive table of contents), first create a heading:
#Real Cool Heading

The anchor link for that heading is the lowercase heading name with dashes where there are spaces. You can always get the anchor name by visiting the README on Github.com and clicking on the anchor that appears when you hover to the left of the heading. Copy everything starting at the #:
#real-cool-heading

Wherever you want to link to your Real Cool Heading section, put your desired text in brackets, followed by the anchor link in parentheses:
[Go to Real Cool Heading section](#real-cool-heading)

ikennaokpala

Go Cheat Sheet

Credits

Most example code taken from A Tour of Go, which is an excellent introduction to Go. If you're new to Go, do that tour. Seriously.

Go in a Nutshell

• Imperative language

pedro

Maintaining a resilient front door at massive scale, from Netflix

• Netflix is responsible for about 1/3 of downstream traffic in NA

• Responsible team in the company is called "edge engineering"

  • Apart from resiliency/scaling, also cares about high velocity product innovation and real time health insights

• Basic architecture:

  • end-user devices make requests to ELBs, which delegates to zuul, which routes to origin servers serving APIs

mlanett

HTTP status code symbols for Rails

Thanks to Cody Fauser for this list of HTTP responce codes and their Ruby on Rails symbol mappings.

Status Code Symbol
1xx Informational
100 :continue
101 :switching_protocols
102 :processing

mgamini

  defmodule EmailValidator do
  
    # ensure that the email looks valid
    def validate_email(email) when is_binary(email) do
      case Regex.run(~r/^[\w.!#$%&’*+\-\/=?\^`{|}~]+@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*$/i, email) do
        nil ->
          {:error, "Invalid email"}
        [email] ->
          try do
            Regex.run(~r/(\w+)@([\w.]+)/, email) |> validate_email

stuart11n

git branch -m old_branch new_branch         # Rename branch locally    
git push origin :old_branch                 # Delete the old branch    
git push --set-upstream origin new_branch   # Push the new branch, set local branch to track the new remote