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In my last meta post, I asked about why we need objective winning criterion. Martin made a really good point that we need objective scoring to motivate users to improve their code.

That said, the argument is a bit weak when it comes to challenges. Because answers have to be run on a single machine, times that users post are mere estimations.

To counteract this, would it be a good idea to require all answers to be in Javascript, and have a stack snippet that runs all of the answers on a page? Users would be able to compare their answers to the current submissions, and would be motivated to improve their code further.

(Note: I'm not saying that the OP doesn't need to run the submissions themselves for the final scores)

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    \$\begingroup\$ I'm pretty sure yes. I've seen fastest-code challenges which do that \$\endgroup\$ – Downgoat Feb 6 '16 at 4:19
  • \$\begingroup\$ @Doᴡɴɢᴏᴀᴛ while I haven't looked through all of them, the only example I can think of is Golf CPU, which is a different scoring mechanism IMO. \$\endgroup\$ – Nathan Merrill Feb 6 '16 at 4:24
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    \$\begingroup\$ I think this isn't actually such a bad idea (we've done the same for KotHs) but the main problem is that the relative performance of different solutions can vastly depend on the browser being used. \$\endgroup\$ – Martin Ender Feb 6 '16 at 8:31
  • \$\begingroup\$ Usually yes for language on other platform ^_^ \$\endgroup\$ – l4m2 Jan 4 '18 at 10:06
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Generally speaking, no.

For challenges, the OPs typically restrict the allowable language to the set of those freely available for their operating systems. Anything further than that would be disallowing a more or less arbitrary set of languages, which is very sternly frowned upon here. So while you can post a language-specific fastest code challenge, it will not likely be well received.

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