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Which dependently typed programming languages could be used for real world application development? I will mostly be writing toy applications at first, after that maybe web development or a simple DBMS.

These are some points, that I think are important:

  • documentation
  • example programs
  • a good/big standard library
  • an easy to use foreign function interface
  • a community of people using the language for real world tasks
  • tool support

I am aware that there is currently no language that meets all these requirements. I'd like to know which one comes closest.

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Unfortunately, you are asking for something that just doesn't exist yet. Things such as big libraries, etc general only come with maturity + large community bases, of which they have no reached.

You can find a list of them on Wikipedia, which will at least let you filter out those that are not actively developed.

What are you reasons for wanting to use a dependently-typed language for web development, etc?

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1  
I've been playing around with ATS a bit. I'm mostly just curious whether it can be done and whether it would actually have advantages over languages without dependent types. Is there a language with a cgi interface or any other kind of integration with a web server? I know the wikipedia list... – Kim Jan 9 '11 at 6:37
    
If you can make it an executable you can surely make it work with CGI. Have I seen any? No. Can I find any? No. I'm not sure what advantages it would have over the current prevailing languages though... – Dan McGrath Jan 9 '11 at 11:00

Probably Agda is the most alive of these, but it's hardly 'commercial grade' software yet, it's more 'bleeding edge'.

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