It's an interesting idea. But one that easily can be skewed towards any particular language's strengths (even unconsciously).

I find this particular example fairly uninspiring, as I'm not sure when I would ever use such a thing. It feels like a completely arbitrary use of a closure to make it hard for languages that don't have such a thing. So, in short, I think it's too arbitrary. E.g. it could just as easily be a list object that overloads stringification to reverse the list. So to me, that makes the "list reversal closure" seems like an example with some unconscious bias.

A better "test" is probably one that considers how a language performs (loosely speaking) on average across similar tasks each presented by advocates of a different language. The idea isn't to see how well one language performs on things it does well, but to see how well it performs on things that other languages do well.

Even that is likely to be highly controversial and unsatisfying. But to the OP's point, I don't think any single test will reveal much of anything.

-xdg

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In reply to Re: list reversal closure by xdg
in thread list reversal closure by apotheon

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