From: Brian Candler <b.candler@...>
Date: 2009-01-29T04:01:49+09:00
Subject: Re: function inside a function

Ruben Medellin wrote:
> In ruby, function_a is a method call (with no arguments), and as a
> call, it gets evaluated to whatever that function returns. If you
> wanted to grab the function as a "pure function", you'd use lambdas or
> Procs like Jes�s pointed.
> 
> In other words:
> 
> function_a = Proc.new {|x| ..do something with x... }
> 
> returns a functional object. You can then call the method with
> function_a.call (aliased [])

Or, if you really want to do this with def'd methods, you can use

   obj.method(:function_a)

which will turn an existing method (bound to the instance 'obj') into a 
Proc-like thing that you can pass around and call later.

def function_a(x = 1)
  x**2 + x
end

def function_b(any_function)
  y = 4 + 5
  any_function.call(y)   # or: any_function[y]
end

puts function_b(method(:function_a))
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