ruby - 确定一个数组是否经常包含另一个数组的所有元素？

Question

我有一个包含可用元素的数组和一个包含所需元素的数组。我想知道是否所有必需的元素都可用。

数组可能包含“重复项”。然后必须有尽可能多的可用元素。我对#contains 的第一次试用？方法失败，因为包括？仅检查一个元素是否至少可用一次

-- 编辑：简化的示例代码 --

# a first and simple trial
# that fails on duplicate elements
class Array
  def contains?(other)
    other.all? { |element| include?(element) }      
  end      
end

available = [1, 1, 1, 2, 2, 3]
small = [1, 1, 2, 3]  
big = [1, 1, 2, 3, 3] 

available.contains?(small) # is true as intended
available.contains?(big)   # is true but should be false
                           # because "big" contains more "3s" than "available"

Answer 1

def contains?(other)
  other.elements.group_by{|e| e}.all?{|e, a| elements.count(e) >= a.length}
end