From: Gavin Sinclair <gsinclair@...>
Date: 2003-09-11T13:42:36+09:00
Subject: Re: What *are* variables? Which are nil now?

> Gavin Sinclair wrote:
>
>> # Now, who can tell me what that "_" local variable is?  Extra points
>> for # telling me why I should have known all along.
>
> Must be an irb thing. I don't see it when executing your code in ruby
> directly, only in irb.

Ah, interesting.  My instinct is to ask: "how can irb inject a local
variable into *my* local context?"

I think I've seen code where "_" is used as a parameter in a block,
signifying that we're not interested in that value.  For instance:

  hash.map { |_, value| f(value) }

Gavin