wolever

/**
 * A LocalStorage-based mutex. Guarantees¹ that only one browser window will be
 * able to execute the code inside the callback at a time.
 *
 * Based on the Alur and Taubenfeld fast lock
 * (http://www.cs.rochester.edu/research/synchronization/pseudocode/fastlock.html)
 * with an added timeout to ensure there will be eventual progress in the event
 * that a window is closed in the middle of the callback.
 *
 * 1. The guarantee assumes that the algorithm is correctly implemented.

markerikson

Cheng Lou - On the Spectrum of Abstraction

Cheng Lou, a former member of the React team, gave an incredible talk at React Europe 2016 entitled "On the Spectrum of Abstraction". That talk is available for viewing here: https://www.youtube.com/watch?v=mVVNJKv9esE

It's only a half-hour, but it is mind-blowing. It's worth re-watching two or three times, to let the ideas sink in.

I just rewatched the talk for some research, and wrote down a summary that's semi-transcript-ish. I didn't see any other transcripts for this talk, other than the auto-generated closed captions, so I wanted to share for reference.

Summary

benfoxall

<script type="text/javascript">
// See MDN: https://developer.mozilla.org/en-US/docs/DOM/MutationObserver?redirectlocale=en-US&redirectslug=DOM%2FDOM_Mutation_Observers
(function(){
  // select the target node
  var target = document.querySelector('body');
  var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
  var i={};
   
  // create an observer instance
  var observer = new MutationObserver(function(mutations) {