From: "Iñaki Baz Castillo" <ibc@...>
Date: 2012-09-10T23:57:35+09:00
Subject: Why does it work? (variable scope)

Two similar cases (same behavior):


1)
---------------------
my_var = 123  if false

puts my_var
=> nil
---------------------


2)
---------------------
if false
  my_var = 123
end

puts my_var
=> nil
---------------------


Somebody could expect that "puts my_var" should raise "NameError:
undefined local variable or method `my_var'" in both cases.

So I can understand that in case 1) the Ruby interpreter knows about
my_var variable since it reads it before checking the "if". But in
case 2) It seems that my_var variable is known when the script/file is
loaded since the interpreter will never run into the "if false"
statement.

Am I right? Thanks a lot.


BTW:

--------------------
puts "1: defined? my_var: #{(defined? my_var).inspect}"

if false
  my_var = 123
end

puts "2: defined? my_var: #{(defined? my_var).inspect}"


=>
1: defined? my_var: nil
2: defined? my_var: "local-variable"
--------------------


-- 
Iñaki Baz Castillo
<ibc@aliax.net>