From: "J. Ryan Sobol" <ryansobol@...>
Date: 2006-01-14T05:29:53+09:00
Subject: Re: [QUIZ.SUMMARY] Dice Roller (#61)

On Jan 13, 2006, at 3:15 PM, J. Ryan Sobol wrote:

> On Jan 13, 2006, at 3:03 PM, James Edward Gray II wrote:
>
>>> Does eval parse @src for each call() message?
>>
>> Yes.  You pass lambda() a block of code that is executed each time  
>> the code it called.
>
> Executed yes.  But when is it parsed / checked for valid grammar,  
> syntax, etc.?  Did you mean to say that the block of code is parsed  
> AND executed for each call() it receives?
>
> ~ ryan ~

obj = lambda { eval "#{2**10}" }

(1..1_000_000).each do
   obj.call
end

$ time ruby test.rb

real    0m26.046s
user    0m24.377s
sys     0m0.358s

-------------------------------------------

obj = eval "lambda { #{2**10} }"

(1..1_000_000).each do
   obj.call
end

$ time ruby test.rb

real    0m3.132s
user    0m2.895s
sys     0m0.047s

What a difference!  I'll agree that parsing of eval's string happens  
on every call() message in the first example.  :)

~ ryan ~