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This notes is written by Sheldon. You can find me with #iOSBySheldon in Github, Youtube, Facebook, etc.

Need

Convert .mov/.MP4 to .gif

Reason

As a developer, I feel better to upload a short video when I create the pull request to show other viewers what I did in this PR. I tried .mov format directly got after finishing recording screen using Quicktime, however, gif offers preview in most web pages, and has smaller file size.

This is not limited to developer, anyone has this need can use this method to convert the files.

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* $ -> go to end of file
* x -> remove char
* :%s/\\//g -> remove `\`
* :%s/<E2><82><AC>/€/g
* :%!python -m json.tool -> pretty json

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arr = [{ lol: 'lol', mdr: 'mdr' }]

def transform_array(list, formatters = {})
  return list if formatters.empty?

  list.map { |item|
    formatters.reduce(item.dup) { |dup, (key, formatter)|
      dup[key] = formatter === item.public_send(:[], key)
      dup
    }

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belongs_to:

1. Assigning an object to a belongs_to association does not automatically save the object. It does not save the associated object either.

has_one:

1. When you assign an object to a has_one association, that object is automatically saved (in order to update its foreign key).
2. In addition, any object being replaced is also automatically saved, because its foreign key will change too
3. If either of these saves fails due to validation errors, then the assignment statement returns false and the assignment itself is cancelled.
4. If the parent object (the one declaring the has_one association) is unsaved (that is, new_record? returns true) then the child objects are not saved. They will automatically when the parent object is saved.

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# Precompile any file in the assets folder
# This fix the bootstrap compilation error
# @see "http://stackoverflow.com/questions/9915950/bootstrap-sass-undefined-variable-baselineheight"
Rails.application.config.assets.precompile += [/^[-_a-zA-Z0-9]*\..*/]

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region_name;department_number;department_name
Rhône-Alpes;1;Ain
Picardie;2;Aisne
Corse;20;Corse-du-Sud
Corse;20;Haute-Corse
Auvergne;3;Allier
Provence-Alpes-Côte d'Azur;4;Alpes-de-Haute-Provence
Provence-Alpes-Côte d'Azur;5;Hautes-Alpes
Provence-Alpes-Côte d'Azur;6;Alpes-Maritimes
Rhône-Alpes;7;Ardèche

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Introduction to ES6 Features

##Arrows functions Arrows functions are shorthand functions using =>syntax. They support block bodies or expression body wich return the value of the expression.

Arrows function have their own context. So using this in arrows function will not refer to his prototype.

// ES5
function addOne(x) {
	return x + 1;

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Rspec guidelines with ruby

You can check the reference documentation [here](http://betterspecs.org/) and beware of deprecated [shoulda matchers](https://robots.thoughtbot.com/shoulda-matchers-2-0).

How to describe your methods

Class methods

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module PopulateConcern
  extend ActiveSupport::Concern

  # ([String, ...]) => {}
  def populate(attributes)
    return self if attributes.blank?
    to_populate = []
    attributes.each do |attr|
      to_populate.push(attr) if self.respond_to?(attr)
    end

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Rails advanced

Before Filters

Est un peu comme les before save des models mais pour les controller

Dans le cas où on a une partie connecté

Donc une before_action :require_login