xgrommx

// Y Combinator

// λf.(λg.f(λy.g g y))(λg.f(λy.g g y))
//
// derives the fixed-point of the input function 
// such that Y( f ) and f( Y( f ) ) are computationally equivalent

function Y( f ) {
  return (function( g ) {
    return f(function( y ) {

xgrommx

open System.Collections.Generic
open Microsoft.FSharp.Collections


[<RequireQualifiedAccess>]
module Folds =

    // These are the fast implementations we actually want to use

xgrommx

var gestureObservable = Rx.Observable.createWithDisposable(function (observer) {
    var gesture = new MSGesture();
    gesture.target = gestureTarget;

    var pointerSub = Rx.Observable.fromEvent(gestureTarget, "pointerdown")
        .subscribe((ev: any) => gesture.addPointer(ev.pointerId));
    var gestureSub = Rx.Observable.fromEvent(gestureTarget, "MSGestureTap")
        .subscribe((ev: MSGestureEvent) => observer.onNext(ev));
    return new Rx.CompositeDisposable(
        pointerSub,

xgrommx

var React = require('react');
var Input = require('react-bootstrap/src/Input');
var Glyphicon = require('react-bootstrap/src/Glyphicon');
var _ = require('lodash');
var Rx = require('rx');
var canUseDom = require('can-use-dom');
var changeCase = require('change-case');

function events(event) {
  return canUseDom ? Rx.Observable.fromEvent(document, event) : Rx.Observable.empty;

xgrommx

##AutoComplete Scenario##

1. Capture user input to send to the service for data: http://jsfiddle.net/mattpodwysocki/uv5JU/

2. Throttle the data so we don't overload the server: http://jsfiddle.net/mattpodwysocki/EJqv5/

3. Ensure minimum number of characters: http://jsfiddle.net/mattpodwysocki/nWfH9/

4. Only distinct values, no repeats!: http://jsfiddle.net/mattpodwysocki/THMPk/

xgrommx

@kangax's ES6 quiz, explained

@kangax created a new interesting quiz, this time devoted to ES6 (aka ES2015). I found this quiz very interesting and quite hard (made myself 3 mistakes on first pass).

Here we go with the explanations:

Question 1:

(function(x, f = () => x) {

xgrommx

Notes on Reactive Extensions .Net

Written for Rx.Net 2.2.5 (released July 2014)

• Observable.Return()
• Observable.Start()
• Observable.Defer()
• IObservable.Publish()
• IObservable.Replay()
• Custom IObservable

xgrommx

-- paste into http://elm-lang.org/try and click "compile"
-- http://imgur.com/gallery/W6TwgZw

import Graphics.Collage exposing (..)
import Graphics.Element exposing (..)
import Text
import Color exposing (..)
import Time
import Signal

xgrommx

// array utils
// =================================================================================================

const combine = (...arrays) => [].concat(...arrays);

const compact = arr => arr.filter(Boolean);

const contains = (() => Array.prototype.includes
  ? (arr, value) => arr.includes(value)
  : (arr, value) => arr.some(el => el === value)

xgrommx

/* jshint esnext:true */

/**
 * "Producer-Consumer" implementation using generators.
 * @see http://en.wikipedia.org/wiki/Deterministic_concurrency#Comparison_with_generators
 */

var SIZE = 3,
    queue = newQueue();