From: Heesob Park <phasis@...>
Date: 2009-06-12T16:45:51+09:00
Subject: How to set $_ in a method?

Hi all,

I like to set caller's $_ variable in a method, but it did't work for me.
Consider this:

def foo
   puts "$_ = #{$_.inspect} enter foo"
   $_ = 'def'
   puts "$_ = #{$_.inspect} exit foo"
end

$_ = 'abc'
puts "$_ = #{$_.inspect} before foo"
foo
puts "$_ = #{$_.inspect} after foo"


The result is:
$_ = "abc" before foo
$_ = nil enter foo
$_ = "def" exit foo
$_ = "abc" after foo

I noticed $_ is is local to the current scope.
Is it impossible to set the caller's $_ variable in a method without
using binding and eval?


Thanks,

Park Heesob