Does modern JavaScript have a terse way to get an object's property and raise an exception if that property doesn't exist?
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Oh, I guess that's what the words mean, but as usual I didn't even think of the possibility that a language would actually be designed this way...
It was less of an intentional original design, and more something that became concrete as the language matured (I believe ES5 was when it became a concrete thing you can control and query)