Grain: A strongly-typed functional programming language for the modern web

Re:Grain: A strongly-typed functional programming language f... by pmontra on Wednesday August 01, 2018 @04:55AM (#17660715)

Reading the compiler code... well, I think I'll wait they write the documentation.

But how's that possible in general? Example, JSON parsing of data from a HTTP request. This is pseudo code

   # request.data is
   # {"a":1, "b":2, "c":"a string"}
   data = parse(request.data) 
   total = data["a"] + data["b"] # 3
   total = total + data["c"] # ops!

The last line is either a compiler error (how? forbidding input is not an option) or a runtime error (Grain doesn't have that) or what?

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Re:Grain: A strongly-typed functional programming language f... by cmmartin on Wednesday August 01, 2018 @02:59PM (#17665802)

I imagine the result here would be the same as in Javascript. This is not an error in Javascript. It would concatenate them and convert to a string. So, you would get the string "3a string". I do see your point though and now agree there should be more documentation covering these cases

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