find the median of all values in a map in ruby

To find the median of all values in a Ruby hash, first we need to extract all the values from the hash into an array. We can then sort this array and find the median.

Here is an example code snippet that demonstrates this approach:

main.rb
# sample hash
test_scores = { "Alice" => 85, "Bob" => 72, "Charlie" => 90, "David" => 68 }

# extract values into an array
values = test_scores.values

# sort the array
sorted_values = values.sort

# find the median
if sorted_values.length % 2 == 0
  median = (sorted_values[sorted_values.length/2 - 1] + sorted_values[sorted_values.length/2]) / 2.0
else
  median = sorted_values[sorted_values.length/2]
end

puts "Median score: #{median}"
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In this code snippet, we have a sample hash test_scores that stores the scores of four students. We extract the values into an array using values = test_scores.values. We then sort the array using sorted_values = values.sort. Finally, we use a conditional statement to find the median of the sorted array. If the array has an odd number of elements, we simply return the middle element. If the array has an even number of elements, we return the average of the two middle elements.

Note that this approach assumes that all values in the hash are numerical. If there are non-numerical values, the sort method will raise an error.