I would love to see a web app with an interface where I select two programming languages and it shows me a really clean snippet of code in language A and says "Look how terribly hard and unclean this is to achieve in language B". (and then you could reverse to see where B outshines A).
Languages are a collection of tradeoffs so I'm pretty sure you could find examples for every two languages in existence. It also makes these kinds of comparisons ~useless.
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