From: Daniel Brockman <daniel@...>
Date: 2005-07-13T01:59:44+09:00
Subject: Re: accessing index inside map

nobu.nokada@softhome.net writes:

> Hi,
>
> At Wed, 13 Jul 2005 01:10:19 +0900,
> Brian Candler wrote in [ruby-talk:147876]:
>> However, perhaps 'to_enum' could be called something friendlier, e.g.
>> 
>>   obj.using(:each_with_index).inject(0) {|sum,(a,i)| sum + a*i}
>
> `using' sounds too general.
>
>> In fact, even
>> 
>>   obj.enum(:each_with_index).inject(0) {|sum,(a,i)| sum + a*i}
>> 
>> reads better to me, as it's not stressing the creation of an intermediate
>> object. to_foo looks like you are converting obj into something completely
>> different, rather than just adding a temporary wrapper.
>
> Enumerable#to_enum has an alias named as #enum_for.

How about just `for'?  That word is already strongly associated
with enumeration, and connects well to the `each_*'.

   obj.for(:each_with_index).inject(0) { |sum, (a, i)| sum + a * i }

However, ``for each inject'' sounds pretty weird, since we're not
injecting something into each element --- we're injecting it into the
whole collection.

I don't know, just a thought.

-- 
Daniel Brockman <daniel@brockman.se>