From: Dhruva Sagar <dhruva.sagar@...>
Date: 2010-09-03T11:09:41+09:00
Subject: Re: Enumerator#each return value is surprising

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Hi,

ruby-1.9.1-p378 > e = [1,2,3].enum_for(:each)
 => #<Enumerator:0x00000001577ce8>
ruby-1.9.1-p378 > e.each {}
 => [1, 2, 3]
ruby-1.9.1-p378 > e.each {|i| p i}
1
2
3
 => [1, 2, 3]

I think it's working just as one would expect it to...what you see as the
return value at the end is 'e' itself.


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Thanks & Regards,
Dhruva Sagar.



On Fri, Sep 3, 2010 at 06:57, Christopher Dicely <cmdicely@gmail.com> wrote:

> Generally in Ruby, if enum is an Enumerable, enum.each returns enum --
> this seems to be the case for all enums. But for Enumerator, it seems
> to return...well, something else. For enumerators created with
> enum_for, it returns the return value of the underlying function,
> e.g.:
>
> irb(main):065:0> e = [1,2,3].enum_for(:each)
> => #<Enumerator: [1, 2, 3]:each>
> irb(main):066:0> e.each {}
> => [1, 2, 3]
>
> While the return value of each is usually not that important (its
> usually used as if it was a procedure rather than for its return
> value), shouldn't Enumerator#each return the receiver like Array#each,
> Hash#each, etc.?
>
>

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