Up to date JavaScript Try-It-Online
Try it online doesn't support the latest JavaScript features such as optional chaining or null coalescence, which are very useful character-saving operators. Is there another site like TIO, but which uses an updated JavaScript engine?
I don't really want to ask people to copy-paste the code into their browser console (or node console etc.) for them to use be able to verify the solution.
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There is a new project called Attempt This Online intended as an alternative to TIO. It's pretty nascent so doesn't yet support the same volume of languages as TIO and the only version of JavaScript currently available is Node.
Other than that, there are plenty of tools available online for writing & running client-side languages like JavaScript, although they're not specifically geared towards golfing. Personally, I'm partial to CodePen but there's also the likes of JSFiddle & JS Bin.
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