如何使用混合字符串和Fixnums对Ruby数组进行排序

Question

我需要在Ruby中对混合数组进行排序.它有Fixnums和Strings

ar = [1, "cool", 3, "story", 4, "bro"]

我希望Fixnums优先于字符串,而不关心字符串的顺序.

ar = [1,3,4,"cool","story","bro"]

我试过写一个方法 class Array

Class Array
  def mixed_sort
    self.sort do |a,b|
      if a.class == Fixnum and b.class != a.class
        -1
      else
        a <=> b
      end
    end
  end
end

我想我可能只是将一个块传递给该Array#sort方法.但是,此方法在按下块之前仍会引发错误

[1] pry(main)> [1, "11", '12', 3, "cool"].mixed_sort
ArgumentError: comparison of String with 3 failed
from /config/initializers/extensions/array.rb:3:in `sort'

Answer 1

我会做如下使用Enumerable#grep:

ar = [1, "cool", 3, "story", 4, "bro"]
ar.grep(Fixnum).sort + ar.grep(String)
# => [1, 3, 4, "cool", "story", "bro"]

如果您还想对字符串进行排序,请执行以下操作:

ar = [1, "cool", 3, "story", 4, "bro"]
ar.grep(Fixnum).sort + ar.grep(String).sort
# => [1, 3, 4, "bro", "cool", "story"]