yowchun93

# Rails customer validation 

#http://blog.arkency.com/2014/04/mastering-rails-validations-contexts/
 
 # giving context to the validation 
 validates_length_of :slug, minimum: 3, on: :user
  
  ## editing , giving context when saving the record 
  def edit
    @user = User.find(params[:id])

yowchun93

run_query = fn(query_def) -> 
  :timer.sleep(2000)
  "#{query_def} result"
end

#after 2 seconds -> "query 1 result"
run_query.("query 1")

# after 10 seconds result returns
1..5 |> Enum.map(&run_query.("query #{&1}"))

yowchun93

## Kernel.send/2 function
send(pid, { :an, :arbitary, :term } )

receive do 
pattern_1 -> do_something
pattern_2 -> do_something_else

## Example to be executed in IEX 
send(self, "a message")

yowchun93

defmodule DatabaseServer do

  def start do
    spawn(&loop/0)
  end

  # public API
  def run_async(server_pid, query_def) do
    send(server_pid, {:run_query, self, query_def})
  end

yowchun93

defmodule Calculator do

  def start do
    spawn( fn -> loop(0) end)
  end

  defp loop(current_value) do
    new_value = receive do
      {sender_pid, :value} ->
        IO.puts("current value is #{current_value}")

yowchun93

defmodule CamelCase do
  def to_camel_case(word) do
    words = String.codepoints(word)
    convert("-", words) |> Enum.join("")
  end

  def convert(a, []) do
    []
  end

yowchun93

Github Battle v2

Step 1
// Setting up package.json, this is done through npm install 

Step 2
// I guess the next step, is to get something to run?!! app.js? index.js? 
// npm install --save-dev @babel/core @babel/preset-env @babel/preset-react webpack webpack-cli webpack-dev-server babel-loader css-loader style-loader html-webpack-plugin

Step 3

yowchun93

// Here i am trying to render a list into my React component 

// obviously start with an array
// Apparently this code does not work, because the code block is not wrapped inside a Div
  render() {
    const languages = ['All', 'Ruby', 'Javascript']
    return (
      {languages.map((language) => (
        <h1>language</h1>
      ))}

yowchun93

19 June 2019 

1. Create ReposGrid Component
2. For every object found in repos , create a list which displays the content
3. Also use font-awesome, to create the labels 

A few questions:
1. Does the ul, and React Fragment still stay inside Popular component? or should be moved to RepoGrid? 

Basically using composition / or whatever that means. 

yowchun93

// 18 June 2019
1. Create Vietnam Retailer in Postco.xyz 
2. Test Vietnam Return Flow, make sure label is there. 
3. 

Testing result
1. ParcelReturn.last.country = ‘VIETNAM’, why?? .
I think it’s because Agent’s country is ‘VIETNAM’ 

pdf.js