This is as far as I've been able to get (so far) with the "Calculate the array mode" exercise in the DBC prep material. Am I on the right track? Am I making this too complicated on myself?

mode.rb

def mode(array)

  # This sets up the hash, each new key defaulting to a value of 0

  count = Hash.new(0)

  # This iterates through the original array,
  # increasing each number's hash value each time it appears in the array.
  
  array.each do |number|
    counter[number] += 1
  end
  
  high_count = count.values.max
  mode = []

  count.each do |k, v|
    if v == high_count
      mode << k
    end
  end
    
  return mode
end

not bad
you could try it in one iteration with an if-else statement

Hmm... sounds like a good idea. I'll wrestle with it for a while!