Warry

How to make faster scroll effects?

• Avoid too many reflows (the browser to recalculate everything)
• Use advanced CSS3 for graphic card rendering
• Precalculate sizes and positions

Beware of reflows

The reflow appens as many times as there are frames per seconds. It recalculate all positions that change in order to diplay them. Basically, when you scroll you execute a function where you move things between two reflows. But there are functions that triggers reflows such as jQuery offset, scroll... So there are two things to take care about when you dynamically change objects in javascript to avoid too many reflows:

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import Dict

-- The transformation function
listToDict : (a -> comparable) -> [a] -> Dict.Dict comparable a
listToDict getKey values = Dict.fromList (map (\v -> (getKey v, v)) values)
 
-- Demo type
type FooBar =
  { foo : String
  , bar : Int

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Warry

module MagicJson exposing (encode, decode, decoder)


import Json.Encode as Encode exposing (Value)
import Json.Decode as Decode exposing (Decoder)
import Http


encode : a -> Value
encode jsonEncodeElmValue =

Warry

Why do you use (flip andThen)?

TLDR; To use it with the pipe (|>) operator.

The actual andThen problem

Here is the signature for Task.andThen:

import Task exposing (andThen)

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Todos =
  # public properties
  list: OOO.observableArray([])

  # public methods
  counter: OOO.computed ()->
    @list.length + " remaining todos"
  clear: ()->
    @list.remove (_)-> _.done

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Monitor is a simple HTML/JS based application. It allows requesting JSON apis, with an history.

This gist is used to try the demo requests on start.

Warry

Lately, with the help of Julien Tournay, I wondered how can we resolve the model problem in the browser which is : there is no ONE true model, and one information can be duplicated in multiple places (eg: form, list, item). Finally, I found out that the real datas are from : the forms > the server > the DOM. Meteor solved this by keeping this order, and synchronize it all in real time ! That's truly great. But. There a hudge cost in this : you have an heavy fullstack architecture, and you can't have control on the async which is black magic. Also, It's made for realtime, so concurrency apps. With Node.js in one thread, I can't imagine an app with thousands of users at the same time managing as much states properly. There is no holly grail. Just code!

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XRefresh for Chrome

Deprecated! Use LiveReload instead.

via xrefresh#17

How to use

• ruby ws_dir_watcher.rb ~/my_site
• Open chrome://extensions/
• "Developer mode", then press "Load unpacked extension" button

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javascript:void(function(){window.addEventListener("keydown",function(e){if(e.metaKey && e.keyCode==82){e.preventDefault();var i,a,s;a=document.getElementsByTagName('link');for(i=0;i<a.length;i++){s=a[i];if(s.rel.toLowerCase().indexOf('stylesheet')>=0 && s.href){var h=s.href.replace(/(&amp;|%5C?)forceReload=d+/,'');s.href=h+(h.indexOf('?')>=0?'&amp;':'?')+'forceReload='+(new Date().valueOf())}}return false}})})();