title: Lua : Storing values in string array
body: <p>I want to store some values for each string element in Lua array. </p>
  
  <pre><code>-- Emulating different Browsers
  local user_agent = {
  "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/22.0.1207.1 Safari/537.1",         
  "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.2 Safari/537.36",          
  "Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1467.0 Safari/537.36",                   
  "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0",                                                                                  
  "Mozilla/5.0 (X11; Linux i686; rv:21.0) Gecko/20100101 Firefox/21.0",                                                               
  "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; FunWebProducts)",                                                          
  "Mozilla/5.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; InfoPath.1; SV1; .NET CLR 3.8.36217; WOW64; en-US)",               
  "Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5355d Safari/8536.25"  
  }
  
  -- Number of connections per host and total connections for each browser/user_agent
   user_agent[1].max_conn_perhost , user_agent[1].max_conn_total = 6, 17
   user_agent[2].max_conn_perhost , user_agent[2].max_conn_total = 6, 10
   user_agent[3].max_conn_perhost , user_agent[3].max_conn_total = 6, 10
   user_agent[4].max_conn_perhost , user_agent[4].max_conn_total = 6, 16
   user_agent[5].max_conn_perhost , user_agent[5].max_conn_total = 6, 16
   user_agent[6].max_conn_perhost , user_agent[6].max_conn_total = 6, 35
   user_agent[7].max_conn_perhost , user_agent[7].max_conn_total = 6, 35
   user_agent[8].max_conn_perhost , user_agent[8].max_conn_total = 6, 16
  </code></pre>
  
  <p>This is throwing error:</p>
  
  <pre><code>attempt to index field '?' (a string value)
  </code></pre>
  
  <p>I have noticed in some examples that, if I haven't initialized the string array, then it will work. 
  Can anyone please suggest any easier solution to achieve this or rectify the issue.</p>