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<article class="markdown-body"><h1 id="tc39-mtg-notes-43-">TC39 MTG Notes 第43回 報告会</h1>
<h2 id="-2014-11-https-github-com-tc39-tc39-notes-tree-master-es6-2014-11-2014-11-"><a href="https://github.com/tc39/tc39-notes/tree/master/es6/2014-11" title="2014-11">2014-11</a> のミーティングノートより</h2>
<hr>
<h1 id="-4-3-assignment-to-a-const-static-error-https-github-com-tc39-tc39-notes-blob-master-es6-2014-11-nov-18-md-43-assignment-to-a-const-static-error-4-3-assignment-to-a-const-static-error-"><a href="https://github.com/tc39/tc39-notes/blob/master/es6/2014-11/nov-18.md#43-assignment-to-a-const-static-error" title="4.3 Assignment to a const: static error?">4.3 Assignment to a const: static error?</a></h1>
<ul>
<li>ES6の<code>const</code>で定義した変数への代入はエラーに<ul>
<li>今まではstrict modeの時のみだった</li>
</ul>
</li>
<li>strict mode / non-strict mode( sloppy mode)どちらもエラー</li>
<li><a href="https://esdiscuss.org/topic/rationale-for-const-not-throwing-in-sloppy-mode" title="Rationale for const not throwing in sloppy mode?">Rationale for const not throwing in sloppy mode?</a></li>
</ul>
<pre><code class="lang-js">const x = 42;
x = 32;// Error!!!
</code></pre>
<hr>
<h1 id="-4-3-assignment-to-a-const-static-error-https-github-com-tc39-tc39-notes-blob-master-es6-2014-11-nov-18-md-43-assignment-to-a-const-static-error-4-3-assignment-to-a-const-static-error-"><a href="https://github.com/tc39/tc39-notes/blob/master/es6/2014-11/nov-18.md#43-assignment-to-a-const-static-error" title="4.3 Assignment to a const: static error?">4.3 Assignment to a const: static error?</a></h1>
<ul>
<li>だがES5で<code>undefined</code>への代入等はnon-strict modeでは何も言わない</li>
<li>代入しても無視されるだけでエラーが出ない</li>
<li>これは引き続きES6でも同じ仕様をが維持される</li>
</ul>
<hr>
<pre><code class="lang-js">"don't use strict";
// もちろんstrict modeならエラー
Object.defineProperty(this, "globalReadOnly", { value: "readonly" });
var func = function f() {
// silently skips assignment
f = undefined;
// silently skips assignment
undefined = 42;
Infinity = 0;
};
func();
</code></pre>
<hr>
<h1 id="-4-6-zepto-broken-by-new-this-construct-usage-in-some-array-prototype-methods-https-github-com-rwaldron-tc39-notes-blob-master-es6-2014-11-nov-18-md-46-zepto-broken-by-new-thisconstruct-usage-in-some-arrayprototype-methods-4-6-zepto-broken-by-new-this-construct-usage-in-some-array-prototype-methods-"><a href="https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-11/nov-18.md#46-zepto-broken-by-new-thisconstruct-usage-in-some-arrayprototype-methods" title="4.6 Zepto broken by new this.construct usage in some Array.prototype methods">4.6 Zepto broken by new this.construct usage in some Array.prototype methods</a></h1>
<ul>
<li><code>new this.constructor()</code> がES5と互換なくなってたのは直す</li>
<li>ZeptoやPromiseのサブクラス的なもので見かける</li>
</ul>
<hr>
<h1 id="-5-1-amp-4-4-array-prototype-contains-and-string-prototype-contains-https-github-com-rwaldron-tc39-notes-blob-master-es6-2014-11-nov-18-md-51-44-arrayprototypecontains-and-stringprototypecontains-5-1-amp-4-4-array-prototype-contains-and-string-prototype-contains-"><a href="https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-11/nov-18.md#51--44-arrayprototypecontains-and-stringprototypecontains" title="5.1 & 4.4 Array.prototype.contains and String.prototype.contains">5.1 & 4.4 Array.prototype.contains and String.prototype.contains</a></h1>
<ul>
<li><code>Array.prototype.contains</code>はBreak the Web<ul>
<li><code>includes</code>に変更！</li>
</ul>
</li>
<li><code>String.prototype.contains</code> => <code>String.prototype.includes</code></li>
<li><code>Array.prototype.contains</code> => <code>Array.prototype.includes</code></li>
</ul>
<hr>
<h1 id="array-prototype-contains-">Array.prototype.containsの変更</h1>
<ul>
<li><a href="https://efcl.wordpress.com/2014/11/22/ecma-tc39-meeting-2014-11%e3%81%ae%e3%83%a1%e3%83%a2/" title="ECMA, TC39 Meeting 2014-11のメモ | GH Issue Note">ECMA, TC39 Meeting 2014-11のメモ | GH Issue Note</a></li>
<li>ブラウザベンダーは大体当日にIssue立てて解決済み</li>
</ul>
<hr>
<h1 id="-4-10-regexp-subclassing-fixes-https-github-com-rwaldron-tc39-notes-blob-master-es6-2014-11-nov-18-md-410-regexp-subclassing-fixes-4-10-regexp-subclassing-fixes-"><a href="https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-11/nov-18.md#410-regexp-subclassing-fixes" title="4.10 RegExp subclassing fixes">4.10 RegExp subclassing fixes</a></h1>
<ul>
<li><code>RegExp.prototype.flags</code> というflagを取るメソッドを追加</li>
<li><code>/test/i.flags // i</code> ?</li>
</ul>
<hr>
<h1 id="-4-12-should-weakmap-weakset-have-a-clear-method-markm-https-github-com-rwaldron-tc39-notes-blob-master-es6-2014-11-nov-19-md-412-should-weakmapweakset-have-a-clear-method-markm-4-12-should-weakmap-weakset-have-a-clear-method-markm-"><a href="https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-11/nov-19.md#412-should-weakmapweakset-have-a-clear-method-markm" title="4.12 Should WeakMap/WeakSet have a .clear method? (MarkM)">4.12 Should WeakMap/WeakSet have a .clear method? (MarkM)</a></h1>
<ul>
<li>WeakMap と WeakSet から <code>clear</code>メソッドが消えました</li>
<li><a href="https://twitter.com/awbjs/status/535829756285964289" title="Allen Wirfs-Brock on Twitter: "ES6 WeakMap and WeakSet 'clear' methods eliminated"">Allen Wirfs-Brock on Twitter: "ES6 WeakMap and WeakSet 'clear' methods eliminated"</a></li>
<li>実装に考慮した感じっぽい</li>
</ul>
<hr>
<h1 id="-abstract-references-as-a-solution-to-ltr-composition-and-private-state-https-github-com-rwaldron-tc39-notes-blob-master-es6-2014-11-nov-19-md-abstract-references-as-a-solution-to-ltr-composition-and-private-state-abstract-references-as-a-solution-to-ltr-composition-and-private-state-"><a href="https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-11/nov-19.md#abstract-references-as-a-solution-to-ltr-composition-and-private-state" title="Abstract references as a solution to LTR composition and private state">Abstract references as a solution to LTR composition and private state</a></h1>
<ul>
<li><img src="https://avatars3.githubusercontent.com/u/5995084?v=3&s=400" alt="icon,inline"> <a href="https://github.com/zenparsing/es-abstract-refs" title="zenparsing/es-abstract-refs">zenparsing/es-abstract-refs</a></li>
<li>ビルドインオブジェクトをprivateに拡張するための抽象インターフェスの定義の提案</li>
</ul>
<hr>
<h1 id="-5-6-object-observe-proposal-to-move-to-stage-3-https-github-com-rwaldron-tc39-notes-blob-master-es6-2014-11-nov-20-md-56-objectobserve-proposal-to-move-to-stage-3-5-6-object-observe-proposal-to-move-to-stage-3-"><a href="https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-11/nov-20.md#56-objectobserve-proposal-to-move-to-stage-3" title="5.6 Object.observe: proposal to move to Stage 3.">5.6 Object.observe: proposal to move to Stage 3.</a></h1>
<ul>
<li>:star: Object.observe がES7 Stage 3へ</li>
<li>恐らくObject.observeが最初のStage 3</li>
<li>参照: <a href="https://azu.github.io/slide/es6talks/" title="明日には使えなくなるES7トーク">明日には使えなくなるES7トーク</a></li>
</ul>
<hr>
<h1 id="-5-4-i-o-streams-as-part-of-the-es-standard-library-https-github-com-rwaldron-tc39-notes-blob-master-es6-2014-11-nov-20-md-54-io-streams-as-part-of-the-es-standard-library-5-4-i-o-streams-as-part-of-the-es-standard-library-"><a href="https://github.com/rwaldron/tc39-notes/blob/master/es6/2014-11/nov-20.md#54-io-streams-as-part-of-the-es-standard-library" title="5.4 I/O Streams as part of the ES standard library">5.4 I/O Streams as part of the ES standard library</a></h1>
<ul>
<li>StreamをECMAScriptに入れるかどうかの話</li>
<li>入れたいとは思うが現状では難しい</li>
<li>I/Oとかそういうものの標準があるならばあるいは</li>
<li>現在はWHATWGで管理してるので仕様団体的な議論</li>
<li>結局今は無理なので提案は撤回</li>
</ul>
<hr>
<h1 id="-">成果</h1>
<p><img src="http://monosnap.com/image/iS38agcWx1VSQggMMo2hNDYMDBTsbq.png" alt="inline,fill"></p>
<ul>
<li><a href="https://github.com/rwaldron/tc39-notes/pull/25">https://github.com/rwaldron/tc39-notes/pull/25</a></li>
<li><a href="https://github.com/rwaldron/tc39-notes/pull/24">https://github.com/rwaldron/tc39-notes/pull/24</a></li>
</ul>
<hr>
<h1 id="-">おわりに</h1>
<ul>
<li><a href="http://tc39-mtg.doorkeeper.jp/" title="TC39 MTG Notes MTG | Doorkeeper">TC39 MTG Notes MTG | Doorkeeper</a></li>
<li>読む時毎回イベントを立てていく予定</li>
<li>オンラインでTwitterに <a href="https://twitter.com/search?f=realtime&q=%23TC39MTG&src=typd" title="#TC39MTG">#TC39MTG</a> とつぶやくだけ</li>
<li>今回: <a href="http://tc39-mtg.doorkeeper.jp/events/18001" title="ECMA, TC39 Meeting Notes 第43回目を読む - TC39 MTG Notes MTG | Doorkeeper">ECMA, TC39 Meeting Notes 第43回目を読む - TC39 MTG Notes MTG | Doorkeeper</a></li>
</ul>
</article>
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