............................ 108 Chapter.5 - Async Function ................................................................................... 116 Async Functionとは .................................. ..................................... 116 Async Functionの構文 ..................................................................................... 119 await 式 ......................................... .................................................................. 121 Async Functionと配列 ..................................................................................... 124 Promises API Reference

. . . . . . . . . . . . . . . . . . . . . . . . 342 XIV 並行性：PM 348 62 ようこそ 349 63 Async の基礎 350 63.1 async/await . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350 63.2 Future . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353 64 チャネルと制御フロー 354 64.1 Async チャネル . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354 64.2 Join . . . . . 65.2 Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358 65.3 Async トレイト . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360 65.4 キャンセル . . . .

@Client 0 is send Client -> Server@+25 : GET +25 is await +75 is recv +25 is idle +25 is send Client -> Server@+25 : GET\nIf-Modified-Since: 150 +25 is await +50 is recv +25 is idle @100 <-> @275 : no need

@Client 0 is send Client -> Server@+25 : GET +25 is await +75 is recv +25 is idle +25 is send Client -> Server@+25 : GET\nIf-Modified-Since: 150 +25 is await +50 is recv +25 is idle @100 <-> @275 : no need

@Client 0 is send Client -> Server@+25 : GET +25 is await +75 is recv +25 is idle +25 is send Client -> Server@+25 : GET\nIf-Modified-Since: 150 +25 is await +50 is recv +25 is idle @100 <-> @275 : no need

@Client 0 is send Client -> Server@+25 : GET +25 is await +75 is recv +25 is idle +25 is send Client -> Server@+25 : GET\nIf-Modified-Since: 150 +25 is await +50 is recv +25 is idle @100 <-> @275 : no need

@Client 0 is send Client -> Server@+25 : GET +25 is await +75 is recv +25 is idle +25 is send Client -> Server@+25 : GET\nIf-Modified-Since: 150 +25 is await +50 is recv +25 is idle @100 <-> @275 : no need

@Client 0 is send Client -> Server@+25 : GET +25 is await +75 is recv +25 is idle +25 is send Client -> Server@+25 : GET\nIf-Modified-Since: 150 +25 is await +50 is recv +25 is idle @100 <-> @275 : no need

setTimeout(function () { resolve('Async Hello world'); }, 16); }); } asyncFunction().then(function (value) { console.log(value); // => 'Async Hello world' }).catch(function (error) でエラーとなった場合の コールバックを設定しています。 このpromiseオブジェクトはsetTimeoutで16ms後にresolveされるので、 そのタイミング で then のコールバックが呼ばれ 'Async Hello world' と出力されます。 8 JavaScript Promiseの本 この場合 catch のコールバックは呼ばれることはないですが、 setTimeout が存在しな Promises - Thinking Sync in an Async World // Speaker Deck15 というスライドではPromiseの状態遷移について分 かりやすく書かれています。 15 https://speakerdeck.com/kerrick/javascript-promises-thinking-sync-in-an-async-world 10 JavaScript Promiseの本