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
(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.
2015-01-29 Unofficial Relay FAQ
Compilation of questions and answers about Relay from React.js Conf.
Disclaimer: I work on Relay at Facebook. Relay is a complex system on which we're iterating aggressively. I'll do my best here to provide accurate, useful answers, but the details are subject to change. I may also be wrong. Feedback and additional questions are welcome.
Relay is a new framework from Facebook that provides data-fetching functionality for React applications. It was announced at React.js Conf (January 2015).
| # Hello, and welcome to makefile basics. | |
| # | |
| # You will learn why `make` is so great, and why, despite its "weird" syntax, | |
| # it is actually a highly expressive, efficient, and powerful way to build | |
| # programs. | |
| # | |
| # Once you're done here, go to | |
| # http://www.gnu.org/software/make/manual/make.html | |
| # to learn SOOOO much more. |
The term variance describes how subtyping between higher kinded types is related to subtyping relations of their type arguments.
A higher kinded type composes type arguments to a new type. I use square bracket notation to define a higher kinded type:
C[T] // The higher kinded type `C` composes type argument `T` to a new type `C[T]`.The same works with multiple type arguments:
A curated list by Eric Elliott and friends. Suggest links at the original in the comments section or in the website incarnation.
This fork includes screen-captures of the websites, self-descriptions (which appear within quotation marks) from those sites and some metadata like publication date and GitHub stars and forks. It also may lag behind the original as new links are added there. Commentary is almost entirely from Eric Elliott’s original gist: a few summary descriptions were added for sites that omit capsule descriptions.
Help us turn this into a proper website!
This is a very exclusive collection of only must-have JavaScript links. I'm only listing my favorite links. Nothing else makes the cut. Feel free to suggest links if you think they're good
On the Refinery29 Mobile Web Team, codenamed "Bicycle", all of our unit tests are written using Jasmine, an awesome BDD library written by Pivotal Labs. We recently switched how we set up data for tests from declaring and assigning to closures, to assigning properties to each test case's this object, and we've seen some awesome benefits from doing such.
Up until recently, a typical unit test for us looked something like this:
describe('views.Card', function() {
This is a proposal for a lightning talk at the Reactive 2015 conference.
NOTE: If you like this, star ⭐ the Gist - the amount of stars decides whether it makes the cut!
React just got stateless components, meaning that they are in essence pure functions for rendering. Pure functions make it dead simple - even fun - to refactor your views
| var args = [].slice.call(arguments, 0); |