title: How do I count vowels?
body: <p>I've seen the solution and it more or less matches</p>
  
  <pre><code>Write a method that takes a string and returns the number of vowels
   in the string. You may assume that all the letters are lower cased. You can treat "y" as a consonant.
  Difficulty: easy.
  
  def count_vowels(string)
      vowel = 0
      i = 0
      while i &lt; string.length  
          if (string[i]=="a" || string[i]=="e" || string[i]=="i" || string[i]=="o"|| string[i]=="u")
              vowel +=1
  end
  
      i +=1
  
  return vowel
  
  end
  
  puts("count_vowels(\"abcd\") == 1: #{count_vowels("abcd") == 1}")
  puts("count_vowels(\"color\") == 2: #{count_vowels("color") == 2}")
  puts("count_vowels(\"colour\") == 3: #{count_vowels("colour") == 3}")
  puts("count_vowels(\"cecilia\") == 4: #{count_vowels("cecilia") == 4}")
  </code></pre>