Asynchronous Adventures in Javascript by Benjamin Diaguid

A really, really _nice_ detailed but understandable discussion of the whys and whats and hows and wheres of asynchronous Javascript code, which has previously been to me nothing but dark magical arts:

1. Understanding the Event Loop: https://medium.com/dailyjs/asynchronous-adventures-in-javascript-understanding-the-event-loop-fc6f968d5f72
2. Callbacks: https://medium.com/dailyjs/asynchronous-adventures-in-javascript-callbacks-39880f1b470e
3. Promises: https://medium.com/dailyjs/asynchronous-adventures-in-javascript-promises-1e0da27a3b4
4. Generators: https://medium.com/dailyjs/asynchronous-adventures-in-javascript-generators-74199218bab2
5. Async/Await: https://medium.com/dailyjs/asynchronous-adventures-in-javascript-async-await-bd2e62f37ffd

The above gives me courage to have another crack at chapter [17](http://eloquentjavascript.net/17_http.html) of "Eloquent Javascript", since I now have more _context_ and _googable_ terms.

'@nelsonic I think you might find the discussion on callbacks useful for your "Elm Architecture in Javascript" tutorial, given that it was assumed the audience might not be familiar with the callback pattern. I myself was aware of delayed evaluation from functional Programming ([thunk](https://en.wikipedia.org/wiki/Thunk)) but did not quite connect the concept of delayed evaluation with asychronicity, so I get two apples for the price of one!: oh, it is called a callback becauses the function will be called later, depending on whether it has finished its work, or is just needed right now!

event loop、callbacks、promises、generators、async/await に関する5つのリンク記事と、Eloquent JavaScript の第17章および Elm Architecture tutorial への参照を確認してください。issue にはリポジトリのファイルも具体的な変更も記載されていないため、完了の定義を決める前に、想定されているドキュメント更新を確認してください。

索引モデルが issue の本文から書いたものです。