From: Albert Schlef <albertschlef@...>
Date: 2010-04-01T10:43:28+09:00
Subject: Re: each_slice()

Rick Denatale wrote:
> No,
> 
> each_slice is/was in Ruby 1.8, but it is defined as part of the
> enumerator extension which needs to be required in order to add
> each_slice and several other instance methods to the enumerable
> module.  It wasn't backported from 1.9, rather 1.9 made the extension
> a standard part of the Enumerable class.
> 
> So requiring enumerator should work for any version of 1.8.x, or at
> least back to 1.8.2 which is the version documented by the 2nd edition
> of the Pickaxe.


Rick, thank you for this info. Much of this is new to me.

I still have a problem. Look:

  some_array.each_slice(2).to_a

I'm not passing a block to each_slice(). This feature, of not passing a 
block, is "relatively" new. That's a problem. I need to know form which 
version of ruby it is supported.

Let me start from the beginning.

My code originally was this:

  some_array.enum_slice(2).to_a

It works on Ruby 1.8.

But I want my code to work on Ruby 1.9 too, and in Ruby 1.9 there's no 
more enum_slice(). Instead, one uses each_slice(). So I changed my code 
to...

  some_array.each_slice(2).to_a

...and it works fine on 1.9. But... it won't work on older versions of 
1.8, because their each_slice() must get a block.

So... how can I make my code work on both 1.9 and older versions of 1.8?

***UPDATE***

Hey, I think I have a solution!! What about the following line?

  some_array.enum_for(:each_slice, 2).to_a

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