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Scala.js was largely done by a single student on top of his other university duties.

I think it's mostly down to determination. Some things are hard, but need to be done.

Haskell people just seem to give up more easily - see all the half-working projects. Nobody finishes stuff, the next dev just starts his own new project, and abandons it later.

Scala.js handily beats JavaScript in terms of IDE support and tooling

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A quick Google suggests Scalajs has had developers paid to work on it (EPFL lab and Lightbend): http://scala-lang.org/blog/2016/03/14/announcing-the-scala-c...

The Haskell community has achieved great things even though most contributions are done in people's spare time. That is determination.

That's nonsense. I think it's great that outside contributions (like allowing the use of the Scala's CI infrastructure) are valued, but the actual commits show a clear picture.

There is no determination in failing to get anything done and doing NIH for a decade.

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