bvaughn

This API was removed in React 17

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Interaction tracing with React

React recently introduced an experimental profiler API. After discussing this API with several teams at Facebook, one common piece of feedback was that the performance information would be more useful if it could be associated with the events that caused the application to render (e.g. button click, XHR response). Tracing these events (or "interactions") would enable more powerful tooling to be built around the timing information, capable of answering questions like "What caused this really slow commit?" or "How long does it typically take for this interaction to update the DOM?".

With version 16.4.3, React added experimental support for this tracing by way of a new NPM package, scheduler. However the public API for this package is not yet finalized and will likely change with upcoming minor releases, so it should be used with caution.

nrollr

Install MySQL on macOS Sierra

This procedure explains how to install MySQL using Homebrew on macOS Sierra 10.12

Install Homebrew

• Installing Homebrew is effortless, open Terminal and enter :
  $ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
• Note: Homebrew will download and install Command Line Tools for Xcode 8.0 as part of the installation process.

Install MySQL

At this time of writing, Homebrew has MySQL version 5.7.15 as default formulae in its main repository :

paulirish

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.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

hofmannsven

MySQL

Getting started

• http://www.sqlteaching.com/
• https://www.codecademy.com/learn/learn-sql
• https://www.codecademy.com/catalog/language/sql

Related tutorials

• MySQL-CLI
• Analyzing Business Metrics

thomseddon

var buggyAndroid = parseInt((/android (\d+)/.exec(window.navigator.userAgent.toLowerCase()) || [])[1], 10) < 4;
if (!history.pushState || buggyAndroid) {
	if (window.location.hash) {
		if(window.location.pathname !== '/') window.location.replace('/#!' + window.location.hash.substr(2)); //Hash and a path, just keep the hash (redirect)
	} else {
		window.location.replace('/#!' + window.location.pathname); //No hash, take path
	}
}

//And then in app.config:

scottjehl

/*!
 An experiment in getting accurate visible viewport dimensions across devices
 (c) 2012 Scott Jehl. 
 MIT/GPLv2 Licence
*/

function viewportSize(){
	var test = document.createElement( "div" );

	test.style.cssText = "position: fixed;top: 0;left: 0;bottom: 0;right: 0;";