From: ara.t.howard@...
Date: 2006-08-25T02:56:12+09:00
Subject: Re: do not understand this closure

On Fri, 25 Aug 2006, Dave Rose wrote:

> in The Ruby Way...chap 1...a crude example of closure doesn't work as
> this irb
> session:
>>> def power(exponent)
>>>  proc {|base| base**exponent}
>>> end
> => nil
>>> square = power(2)
> => #<Proc:0x02dc58f0@(irb):2>
>>> cube = power(3)
> => #<Proc:0x02dc58f0@(irb):2>
>>> p square
> #<Proc:0x02dc58f0@(irb):2>
> => nil
>>> square(11)
> NoMethodError: undefined method `square' for main:Object
>        from (irb):7
>>> a=square(11)

>>> a=square[11]
             ^  ^
             ^  ^
             ^  ^
             ^  ^


-a
-- 
to foster inner awareness, introspection, and reasoning is more efficient than
meditation and prayer.
- h.h. the 14th dali lama