From: Joel VanderWerf <vjoel@...>
Date: 2006-10-25T01:53:07+09:00
Subject: Re: What's the difference between send and instance_eval?

michele wrote:
> So there is no need for "send"?

One use of #send:

a=[]
@x=3
a.send :<<, @x
p a

@x=4
a.instance_eval { self << @x }
p a

__END__

Output:

[3]
[3, nil]

This is because @x is in a different scope inside the instance_eval block.

Another case, showing the real point of #send:

msg = :reverse
a = [1,2,3]
b = a.send msg
p b

__END__

Output:

[3, 2, 1]

There's no easy equivalent with #instance_eval and blocks (you could 
mess with strings, though).

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407