title: How to use Joi to validate map object (map keys and map values)
body: <p>For example, there is the following map:</p>
  
  <pre><code>keys = type string, 5 characters long
  values = type number
  </code></pre>
  
  <p>Example:</p>
  
  <pre><code>test = {
     "abcde": 1
     "12345": 2
     "ddddd": 3
  }
  </code></pre>
  
  <p>How to write Joi Scheme that validates key are of type string with 5 characters and values are of type number</p>