title: How do I remove a nil key from my hash?
body: <p>With Ruby 2.4, I want to count the number of occurrences of an element and store them in a hash.  However, I don't want to include any nil keys in my hash.  So I tried</p>
  
  <pre><code>my_hash = int_data_col.each_with_object(Hash.new(0)) { |i, h| h[i]+=1 }.delete(nil)
  </code></pre>
  
  <p>but this returns "1".  If I leave off the "delete(nil)", it returns a hash, but then a nil key is included in the hash (assuming a nil was present in the "int_data_col" array).  How do I remove the nil key from my hash and still get the correct results?</p>