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Update: Optional Chaining is finally in Stage 4!! Which means it is part of the ES2020 specification. It has also already made it to TypeScript v3.7. Here's the repo with all the info you need. What is it? Optional Chaining allows us to check if an object exists before trying to access its properties. Some other languages have something similar. C#, for example, has a Null Conditional Operator tha
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Toggle shortcuts help? Toggle "can call user code" annotationsu Jump to search box/ Draft / August 4, 2022JSX Introduction JSX is an XML-like syntax extension to ECMAScript without any defined semantics. It's NOT intended to be implemented by engines or browsers. It's NOT a proposal to incorporate JSX into the ECMAScript spec itself. It's intended to be used by various preprocessors (transpilers)
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All major browsers (if beta versions are included) now support accessing stack traces from scripts. However, no single browser agree on the details of how stack traces are accessible. function f() { try { doSomething(); } catch (err) { alert(err.stack) } } f(); Should alert something like: ReferenceError: doSomething is not defined at f (http://www.example.com/temp.html:5:5) at http://www.example.
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783129 - Implement the document.register interface method mozilla-central: changeset 123773:871fea464883 ã«ã¹ã¿ã è¦ç´ ãä½ããããã«ãªã£ããDOMè¦ç´ ã¯åã«DOM APIãå¼ã³åºãã ãã®åå¨ã ã£ãã®ããç¬èªã®ã¡ã½ããã¨ãã追å ã§ããããã«ã£ãããã§ããããªãã¸ã§ã¯ãæåçã«JavaScriptãæ¸ãã¾ããï¼ ä»æ§ Introduction to Web Components Custom Elements ãµã³ãã«ã³ã¼ã 詳細ã¯ããã¹ãã³ã¼ããè¦ãã»ããè¯ãããã http://mxr.mozilla.org/mozilla-central/source/dom/tests/mochitest/webcomponents/test_document_register.html?force
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