staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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joho

Steps to install and run PostgreSQL 9.2 using Homebrew (Mac OS X)
(if you aren't using version 9.1.5, change line 6 with the correct version)

1. launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
2. mv /usr/local/var/postgres /usr/local/var/postgres91
3. brew update
4. brew upgrade postgresql
5. initdb /usr/local/var/postgres -E utf8
6. pg_upgrade -b /usr/local/Cellar/postgresql/9.1.5/bin -B /usr/local/Cellar/postgresql/9.2.0/bin -d /usr/local/var/postgres91 -D /usr/local/var/postgres
7. cp /usr/local/Cellar/postgresql/9.2.0/homebrew.mxcl.postgresql.plist ~/Library/LaunchAgents/

fay-jai

import React from "react";
import { render } from "react-dom";

const ParentComponent = React.createClass({
  getDefaultProps: function() {
    console.log("ParentComponent - getDefaultProps");
  },
  getInitialState: function() {
    console.log("ParentComponent - getInitialState");
    return { text: "" };

brettz9

/**
 * Add dataset support to elements
 * No globals, no overriding prototype with non-standard methods, 
 *   handles CamelCase properly, attempts to use standard 
 *   Object.defineProperty() (and Function bind()) methods, 
 *   falls back to native implementation when existing
 * Inspired by http://code.eligrey.com/html5/dataset/ 
 *   (via https://github.com/adalgiso/html5-dataset/blob/master/html5-dataset.js )
 * Depends on Function.bind and Object.defineProperty/Object.getOwnPropertyDescriptor (polyfills below)
 * All code below is Licensed under the X11/MIT License

zenorocha

Basic Auth

• New docs
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Create account

New API

pedronauck

import { useEffect } from 'react'
import hotkeys from 'hotkeys-js'

export const useHotkeys = (key: string, cb: () => any, inputs?: any[]) => {
  useEffect(() => {
    hotkeys(key, cb)
    return () => hotkeys.unbind(key)
  }, inputs)
}

jannecederberg

<form id="contact-form" action="//formspree.io/your@email.com" method="post">
	<input type="text" name="Name" placeholder="Name" required>
	<input type="email" name="Email" placeholder="Email" required>
	<textarea name="Message" cols="30" rows="6" placeholder="Message" required></textarea>
	<!-- CONFIG -->
	<input class="is-hidden" type="text" name="_gotcha">
	<input type="hidden" name="_subject" value="Subject">
	<input type="hidden" name="_cc" value="email@cc.com">
	<!-- /CONFIG -->
	<input class="submit" type="submit" value="Send">

acdlite

Demo: Coordinating async React with non-React views

tl;dr I built a demo illustrating what it might look like to add async rendering to Facebook's commenting interface, while ensuring it appears on the screen simultaneous to the server-rendered story.

A key benefit of async rendering is that large updates don't block the main thread; instead, the work is spread out and performed during idle periods using cooperative scheduling.

But once you make something async, you introduce the possibility that things may appear on the screen at separate times. Especially when you're dealing with multiple UI frameworks, as is often the case at Facebook.

How do we solve this with React?

kentcdodds

// handy method to create a Higher Order Component out of a
// Render Prop Component (like a Context.Consumer).
// handles, statics, displayName, refs, and value forwarding

function createHOCFromRenderProp({prop, Consumer}) {
  return Component => {
    function Wrapper(props, ref) {
      return (
        <Consumer>
          {value => <Component {...{...props, [prop]: value, ref}} />}

AimeeKnight

• Gecko Reflow Visualization
• css-stacking-contexts-wtf
• critical-rendering-path
• why-do-browsers-match-css-selectors-from-right-to-left
• getting-started-with-the-webkit-layout-code
• improving-css-performance-fixed-position-elements
• BlinkOn 5: Paint and Compositing Deep Dive
• a-quick-overview-of-chromes-rendering-path
• [render-blocking-css](https://developers.google.com/web/fundamentals/performance/critical-rendering-path/render-b