> I'll start with heavy number crunching (Go/C) and browser-based apps (JS)
Be careful to distinguish between the language and a particular implementation or runtime environment.
Go, for example, runs perfectly well in the browser[0] except for channels (which are very difficult to implement reliably given the Javascript concurrency model).
If Google decided to allow Go as a language for manipulating the DOM in Chrome, there's no reason that it couldn't serve this role equally well. (This is what Google has done with Dart, so they're unlikely to do it with Go, but this is simply illustrative).
Be careful to distinguish between the language and a particular implementation or runtime environment.
Go, for example, runs perfectly well in the browser[0] except for channels (which are very difficult to implement reliably given the Javascript concurrency model).
If Google decided to allow Go as a language for manipulating the DOM in Chrome, there's no reason that it couldn't serve this role equally well. (This is what Google has done with Dart, so they're unlikely to do it with Go, but this is simply illustrative).
[0] https://github.com/gopherjs/gopherjs