find the kth smallest key in a map in ruby

To find the kth smallest key in a map, we can sort the keys of the map and then return the kth element from the sorted array.

Here's one way to do it in Ruby:

main.rb
def kth_smallest_key(map, k)
  keys_sorted = map.keys.sort
  keys_sorted[k-1]
end
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This method takes a map and the value of k as input, and returns the kth smallest key in the map. It first creates a sorted array of keys using map.keys.sort, and then returns the element at index k-1 of that array.

Note that this method assumes that the map has at least k keys; if the map has fewer than k keys, the method will raise a NilClass error when trying to access the kth element of the sorted array.