Chrome recently added optional chaining syntax support
It does not work in Observable (In the same browser)
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Observable extends JavaScript, so when new features get added to JavaScript, we must update our parser to support them in Observable.
We typically only do this when features are supported by most browsers (Chrome, Firefox, Safari, Edge). The optional chaining proposal appears to have reached stage 4 and is supported by the latest browsers except Safari, so we’ll probably add support for it soon.
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