From: Guten <ywzhaifei@...>
Date: 2010-12-31T22:12:44+09:00
Subject: Re: a common idiom

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enumerator.each_with_object [] do |value, memo|
   memo << value unless value.nil?
end


On Fri, Dec 31, 2010 at 9:11 PM, Guten <ywzhaifei@gmail.com> wrote:

> enumerator.each_with_object [] do |value, memo|
>    memo << value if value.nil?
> end
>
>
>
> On Fri, Dec 31, 2010 at 6:50 PM, Michel Demazure <michel@demazure.com>wrote:
>
>> Michael Fellinger wrote in post #971622:
>> > compact
>> Yes ! I knew there was a method, but forgot the name, browsed thru
>> Flanagan-Matz, and did not find it.
>>
>> > results = []
>> > some.each do |value|
>> >   results << value.operation if value.condition?
>> > end
>>
>> Yes, returning results, but I try to avoid this extra variable. I
>> dislike (question of taste) the pattern
>> def ...
>>  res = []
>> ...
>>  res <<
>> ...
>>  res
>> end
>>
>> Another way is using tap
>>
>> Array.new.tap do |res|
>> ...
>> end
>>
>> A bit snob, no ?
>>
>> --
>> Posted via http://www.ruby-forum.com/.
>>
>>
>

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