title: What metrics would be usable to determine expertise level in a particular programming language
body: <p>I am interesting in the raw (or composite) metrics used to get a handle on how well a person can program in a particular language.</p>
  
  <p><em>Scenario: George knows a few programming languages and wants to learn "foobar", but He would like to know when he has a reasonable amount of experience in "foobar".</em></p>
  
  <p>I am really interesting in something broader than just the LOC (lines of code) metric.</p>
  
  <p>My hope for this question is to understand how engineers quantify the programming language experiences of others and if this can be mechanically measured.</p>
  
  <p>Thanks in Advance!</p>