红宝石选择并在一种方法中拒绝 [英] Ruby Select and Reject in one method

问题描述

有没有内置的方法，将合并的选择功能（找到所有该块等于真）和拒绝（找到所有该块相当于为false）？

Is there any built in method that would combine the functions of select (find all which the block equates to true) and reject (find all which the block equates to false)?

像

good, bad = list.magic_method { |obj| obj.good? }

不会太辛苦做我自己，但美国国立卫生研究院和所有。 ：）

Wouldn't be too hard to do it myself but NIH and all that. :)

推荐答案

看起来好像<一个href=\"http://www.ruby-doc.org/core/classes/Enumerable.html#M001496\"><$c$c>Enumerable.partition是你是什么了。

Looks as if Enumerable.partition is exactly what you are after.

= Enumerable.partition

(from ruby core)
------------------------------------------------------------------------------
  enum.partition {| obj | block }  -> [ true_array, false_array ]
  enum.partition                   -> an_enumerator

------------------------------------------------------------------------------

Returns two arrays, the first containing the elements of enum for
which the block evaluates to true, the second containing the rest.

If no block is given, an enumerator is returned instead.

   (1..6).partition {|i| (i&1).zero?}   #=> [[2, 4, 6], [1, 3, 5]]

有趣的，我不知道在那里。 里是一个了不起的工具...

Interesting, I didn't know that was there. ri is an amazing tool...

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