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Ruby: 获得最大值的散列配对
原标题:Ruby: get hash pair with max value
  • 时间:2012-05-22 03:34:13
  •  标签:
  • ruby

这里有一个散沙 记录我每个果实的多少

fruits = {"apples" => 10, "pears" => 15, "bananas" => 15, "grapes" => 12}

And I want to know which fruit I have the most of.
If there are tie-breakers then just return them all.

最佳回答
# easy
max_quantity = fruits.values.max
max_fruits = fruits.select { |k, v| v == max_quantity }.keys

# fast                                                                          
max_quantity = -1.0/0.0
max_fruits = []
fruits.each do |k, v|
  if v > max_quantity
    max_quantity = v
    max_fruits = []
  end
  max_fruits.push k if v == max_quantity
end

由于例外情况是Bad(tm),这两个情况总是返回一个阵列。

问题回答
max_value = fruits.values.max
keys = fruits.select{|k, v| v == max_value}.keys




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