[Haskell-beginners] Haskell as a useful practical 'tool' for intelligent non-programmers

[Lyndon Maydwell]

Your first example is not behaving how you think it is...


ruby-1.9.2-p0 :012 > def foo
ruby-1.9.2-p0 :013?>   puts "foo"
ruby-1.9.2-p0 :014?> end
 => nil
ruby-1.9.2-p0 :015 > def call_arg(f)
ruby-1.9.2-p0 :016?>   puts "calling"
ruby-1.9.2-p0 :017?>   f
ruby-1.9.2-p0 :018?> end
 => nil
ruby-1.9.2-p0 :019 > call_arg(foo)
foo
calling
 => nil

Note that "foo" is printed before "calling".


On Sun, Apr 29, 2012 at 10:22 AM, Michael Orlitzky <michael at orlitzky.com> wrote:
> On 04/28/2012 08:47 PM, Mike Meyer wrote:
>>
>> Ruby makes a bad fit if Haskell is a goal (and that's a good
>> goal). Ruby functions aren't first-class objects, and can't simply be
>> passed to other functions as arguments.
>
> That's like, the least true thing you can say about Ruby =)
>
> A simple test program:
>
>  $ cat fcf.rb
>  def foo
>    puts "foo"
>  end
>
>  def call_arg(f)
>    f
>  end
>
>  call_arg(foo)
>
>
> Running it:
>
>  $ ruby fcf.rb
>  foo
>
>
> Moreover, every function and method implicitly accepts a function as an
> argument:
>
>  $ cat yield.rb
>  def call_block
>    yield
>  end
>
>  call_block { puts "foo" }
>
> This allows you some nice do-block syntactic sugar instead of lambdas
> which can get ugly.
>
>  $ ruby yield.rb
>  foo
>
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