From: "Y. NOBUOKA" <nobuoka@...>
Date: 2011-03-22T20:14:34+09:00
Subject: Re: Difference between for and someclass.each do |var|

Hi,

>> for var in class.each do
>>  #stuff
>> end
>>
>> class.each do |var|
>>  #stuff
>> end
>
> it is just syntatical sugar. Both are essentially equal.
> The only difference is that each is a method of an Enumerable.

In a for/in loop, you need not call #each method.
I think following two code snippets are mostly equal.

# the #each method call isn't needed
for var in obj do
  # stuff
end

# mostly equivalent to the previous snippet
obj.each do |var|
  # stuff
end

Note:
A #each method returns a Enumerator object if you don't provide a block.

~$ irb
ruby-1.9.2-p136 :001 > [].each # provide no block
 => #<Enumerator: []:each>
ruby-1.9.2-p136 :002 > [].each {} # provide a block
 => []

Regards,
-- 
NOBUOKA Yu