javascript: document.body.setAttribute( "style", "-webkit-transform: rotate(-90deg);");
paste into JS console: Ctrl-Shift-C -> "Console" from top menu
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1. Download the Android Jelly Bean fonts and the Symbola font: | |
https://www.dropbox.com/s/tvtzcnzkvbe0nrt/jelly-bean-fonts.zip | |
http://users.teilar.gr/~g1951d/Symbola707.zip | |
2. unzip the files and put AndroidEmoji.ttf and Symbola.ttf (and any of the other fonts that strike your fancy) | |
in your ~/.fonts/ directory | |
3. run `fc-cache -f`. You can check to make sure the new fonts | |
were installed with `fc-list`. You'll probably want to grep the copious output for Symbola or Emoji |
(by @andrestaltz)
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.
In React's terminology, there are five core types that are important to distinguish:
React Elements
import { Component } from "React"; | |
export var Enhance = ComposedComponent => class extends Component { | |
constructor() { | |
this.state = { data: null }; | |
} | |
componentDidMount() { | |
this.setState({ data: 'Hello' }); | |
} | |
render() { |
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.
Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.
elem.offsetLeft
, elem.offsetTop
, elem.offsetWidth
, elem.offsetHeight
, elem.offsetParent
var smoothScrolling = { | |
// add smooth vertical scrolling to internal anchors | |
init: function() { | |
// if new native support available we don't need any of this | |
var isSmoothScrollSupported = 'scrollBehavior' in document.documentElement.style; | |
if (isSmoothScrollSupported) { | |
return; | |
} | |
this.bindEvents(); |