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//indent rule
return Promise.all(keys.map(key => scan(key)))
    .then(result => [].concat(...result))
    .then(expireKeys.bind(null, client));
    
//beauiful
return Promise.all(keys.map(key => scan(key)))
              .then(result => [].concat(...result))
              .then(expireKeys.bind(null, client));
    

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// Count the iterations
let count = 0;

const isMultipleOf3Or5 = n => (n % 3 === 0 || n % 5 === 0);

// Reducer functions can be composed if we abstract the differences.
// The filter's predicate function will need to be abstracted
// and curried in for function composition:
const filterReducer = predicate => reducer => (
  acc, item

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# sinatra
require 'sinatra'
require 'json'

get '/' do
  'Hello sinatra'
end

get '/api/v2/users/:user_id/subscriptions' do
  user_id = params['user_id']

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# test 대상 class
class Mailer

  def self.deliver(&block)
    mail = MailBuilder.new(&block).mail
    mail.send_mail
  end

  Mail = Struct.new(:from, :to, :subject, :body) do 
    def send_mail

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What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

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npm outdated --depth=0 | grep -v Package | awk '{print $1}' | xargs -I% npm install %@latest --save-dev

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/**
 * Object descriptor
**/

var a = {
  prop1 : 14
}

var descriptorObj1 = Object.getOwnPropertyDescriptor(a, 'prop1');

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

So you're curious in learning this new thing called (Functional) Reactive Programming (FRP).

Learning it is hard, even harder by the lack of good material. When I started, I tried looking for tutorials. I found only a handful of practical guides, but they just scratched the surface and never tackled the challenge of building the whole architecture around it. Library documentations often don't help when you're trying to understand some function. I mean, honestly, look at this:

Rx.Observable.prototype.flatMapLatest(selector, [thisArg])

Projects each element of an observable sequence into a new sequence of observable sequences by incorporating the element's index and then transforms an observable sequence of observable sequences into an observable sequence producing values only from the most recent observable sequence.

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Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

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Go言語入門

目次

• Go言語とは
• Hello Go
• 変数
• 型
• 関数
• ループ