查找具有特定属性最大值的 Ruby 数组元素
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Finding the element of a Ruby array with the maximum value for a particular attribute
提问by Richard Stokes
There is probably a very simple answer to this question, but I can't for the life of me figure it out at the moment. If I have a ruby array of a certain type of objects, and they all have a particular field, how do I find the element of the array the has the largest value for that field?
这个问题可能有一个非常简单的答案，但我目前无法弄清楚。如果我有一个特定类型对象的 ruby 数组，并且它们都有一个特定的字段，我如何找到该字段具有最大值的数组元素？
回答by David Grayson
array.max_by do |element|
element.field
end
Or:
或者：
array.max_by(&:field)
回答by p.matsinopoulos
Does this help?
这有帮助吗？
my_array.max {|a,b| a.attr <=> b.attr }
(I assume that your field has name attr)
（我假设你的领域有 name attr）
回答by Linju
You can also sort the array and then get max, min, second largest value etc.
您还可以对数组进行排序，然后获得最大值、最小值、第二大值等。
array = array.sort_by {|k,v| v}.reverse
puts hash[0]["key"]
