Ruby Select和Reject在一个方法中

Question

是否有任何内置方法可以组合Enumerable.select(查找块等于true的Enumerable.reject所有内容)和(找到块等于false的所有内容)的函数？

就像是

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

Answer 1

看起来就像Enumerable.partition你正在追求的那样.

= 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]]

有意思,我不知道那里有. ri是一个了不起的工具......