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Things like E4X, sharp variables, and array comprehensions have already been removed; it's just that the mass of newer developers mean the average doesn't know about them. Unfortunately it's not like they never remove things.

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As far as I'm aware none of those were ever supported in more than one engine (specifically Firefox) and so cannot reasonably be considered to have been part of JavaScript. JS really does make a point of not removing things.

There are some _very_ rare exceptions, but they're things like "support for subclassing TypedArrays", and even then this is only considered after careful analysis to ensure it's not breaking anyone.

I didn't know about either of those, and I've been using js for 20ish years. I could have used those sharp variables in a previous project! Fortunately it's not terribly hard to do the same thing with an IIFE. Or get() method.

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