jcouyang

/*
 Interface to Shinyei Model PPD42NS Particle Sensor
 Program by Christopher Nafis 
 Written April 2012
 
 http://www.seeedstudio.com/depot/grove-dust-sensor-p-1050.html
 http://www.sca-shinyei.com/pdf/PPD42NS.pdf
 
 JST Pin 1 (Black Wire)  => Arduino GND
 JST Pin 3 (Red wire)    => Arduino 5VDC

jcouyang

Practical Monads

ToC

• Monad
• Promise
• Observable
• Demo

Monad

jcouyang

Redux is so popular, and it really can handle component state pretty well, but after working around with large scale project, it seems not as good as it’s promising.

#What’s the problem

##1. Reusability

All reducers is a pure function which is really great, which makes all reducers composible, predictable. However, the switch case statement in reducer ruined all those good parts from pure function. 

Switch cases make function multiple purpose, which breaks both single responsibility and open close principle. Breaking the principles means it’s hard to compose and reuse any data flow(tiny reducer) in switch cases. 

jcouyang

  digraph {
          node[shape=record]
          newrank=true;
          subgraph cluster_level1{
                  style=dotted;
                  vec2[shape=plaintext]
                  node0[label = "<f0> root |<f1> tail"];
                  node1[label="<f0>|<f1>"];
                  node2[label="<f0>|<f1>"];
                  node3[label="<f0>|<f1>"];

jcouyang

require "nokogiri"
require "open-uri"
url = "https://github.com/#{params['username']}"
document = Nokogiri::HTML(open(url))
contrib_boxes = document.css('svg.js-calendar-graph-svg')[0]
contrib_boxes['xmlns']="http://www.w3.org/2000/svg"
width = (params['width']||54*13-2).to_i
height = (params['height']||89).to_i
contrib_boxes.css('text').remove
contrib_boxes['width']=(width+11).to_s+'px'

jcouyang

general:
  branches:
    only:
      - master
machine:
  node:
    version: 5.0.0
dependencies:
  pre:
    - npm install -g babel-cli    

jcouyang

we all know orgmode can #+include localfile, but how we can include a file somewhere on the web, for example gist.

here's how you can embedding a org source from gist and include in your org file.

#+BEGIN_SRC sh :exports results :results raw
curl https://gist.githubusercontent.com/jcouyang/d8086961761f28f35bb9/raw/2c6df28e349ab81ac10e3f6f63d65e20df296729/glist-testing.md
#+END_SRC

jcouyang

require "nokogiri"
require "open-uri"
url = "https://github.com/#{params['username']}"
document = Nokogiri::HTML(open(url))
{
  :pop_repos => document.css('.js-pinned-items-reorder-list').to_html,
  :calendar => document.css('.js-calendar-graph-svg').to_html
}

jcouyang

{"todos":{
  "0":{"name":"get milk from corner store","done":false},
  "1":{"name":"take a dump","done":true},
  "2":{"name":"make someone eat the dump","done":false},
  "length":10}
}

jcouyang

macro caseFunc {
    case {_ ($args...) {$body... $last:expr}} =>
    {
      letstx $len = [makeValue(#{$args...}.length , null)];
      return #{
      case $len:
        return (function($args...){$body... return $last}).apply(this, arguments)
      }
    }
}