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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://fosstodon.org/users/rauschma/statuses/113742953434001653">Axel Rauschmayer (rauschma@fosstodon.org)'s status on Tuesday, 31-Dec-2024 03:19:51 JST</a><a href="https://fosstodon.org/@rauschma" title="rauschma@fosstodon.org"><img src="https://gnusocial.jp/avatar/14578-48-20231122144129.webp" width="48" height="48" alt="Axel Rauschmayer" style="position: absolute; left: 0; top: 0;">Axel Rauschmayer</a></section><article><p>It’s a shame that JavaScript still has no built-in support for equality checks and that its support for cloning (not part of ECMAScript, but supported by virtually all platforms) has significant limitations—e.g., the clone of an instance of C is not an instance of C:</p><p>class C {}<br>const clone = structuredClone(new C());</p><p>assert.equal(clone instanceof C, false);<br>assert.equal(<br>  Object.getPrototypeOf(clone),<br>  Object.prototype<br>);</p><p>More information: <a href="https://2ality.com/2022/01/structured-clone.html" rel="nofollow noreferrer">https://2ality.com/2022/01/structured-clone.html</a></p><p><a href="https://fosstodon.org/tags/JavaScript" rel="tag">#JavaScript</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/4282822#notice-8371965">In conversation</a><time datetime="2024-12-31T03:19:51+09:00" title="Tuesday, 31-Dec-2024 03:19:51 JST">about 19 days ago</time> <span>from <span><a href="https://fosstodon.org/@rauschma/113742953434001653" rel="external" title="Sent from fosstodon.org via ActivityPub">fosstodon.org</a></span></span><a href="https://fosstodon.org/@rauschma/113742953434001653">permalink</a><h4>Attachments</h4><ol><li><article><header><div>No result found on File_thumbnail lookup.</div><h5><a href="https://2ality.com/2022/01/structured-clone.html#JavaScript">`structuredClone()`: deeply copying objects in JavaScript</a></h5><div></div></header><div>Spreading is a common technique for copying objects in JavaScript: Spreading into an Array literal to copy an Array Spreading into an Object literal to copy a plain object Spreading has one significant downside – it creates shallow copies: The top levels are copied, but property values are shared. structuredClone() is a new function that will soon be supported by most browsers, Node.js and Deno. It creates deep copies of objects. This blog post explains how it works.</div><footer></footer></article></li></ol></footer></blockquote>

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Axel Rauschmayer (rauschma@fosstodon.org)'s status on Tuesday, 31-Dec-2024 03:19:51 JST Axel Rauschmayer
It’s a shame that JavaScript still has no built-in support for equality checks and that its support for cloning (not part of ECMAScript, but supported by virtually all platforms) has significant limitations—e.g., the clone of an instance of C is not an instance of C:
class C {}
const clone = structuredClone(new C());
assert.equal(clone instanceof C, false);
assert.equal(
Object.getPrototypeOf(clone),
Object.prototype
);
More information: https://2ality.com/2022/01/structured-clone.html
#JavaScript
In conversationabout 19 days ago from fosstodon.orgpermalink
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1. No result found on File_thumbnail lookup.
  `structuredClone()`: deeply copying objects in JavaScript
  Spreading is a common technique for copying objects in JavaScript: Spreading into an Array literal to copy an Array Spreading into an Object literal to copy a plain object Spreading has one significant downside – it creates shallow copies: The top levels are copied, but property values are shared. structuredClone() is a new function that will soon be supported by most browsers, Node.js and Deno. It creates deep copies of objects. This blog post explains how it works.

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