Ruby: get hash pair with max value

Question

Here's a hash that keeps track of how much of each fruit I have

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.

Answer 1

# 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

Since exceptional cases are Bad(tm), both of these always return an array.

Answer 2

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