Invisible wrote:
> But yes, this (alpha) web thingy lacks several important features:
> 
> - You can't define things and refer to them later. Each expression is
> processed independently.
> 
> - You can't write multi-line definitions.
> 
> - You can't do I/O. (And the error message if you try is cryptic to say
> the least!)
> 
> - You can't use all of the standard Haskell libraries, just the handful
> the interpretter offers.

They seriously should steal features from http://tryruby.org/

- You can define variables and refer to them later. Example, type a=1, press 
Enter, then type a+a.

- You can write multi-line definitions. Try this one:

5.times {
    print "Hello"
}

When it parses the first line, it will notice the statement is incomplete 
and let you continue it.

- You can do I/O (fake filesystem). The whole chapter 4 of the tutorial is 
about I/O and file handling.

- You can do HTML and see the results via a custom library made for the 
tutorial. Try:

require "popup"
Popup.make {
   h1 "Hello world"
   p "foo"
}

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