title: Most lightweight way to create a random string and a random hexadecimal number
body: <p>What is the most lightweight way to create a random string of 30 characters like the following?</p>
  
  <blockquote>
    <p>ufhy3skj5nca0d2dfh9hwd2tbk9sw1</p>
  </blockquote>
  
  <p>And an hexadecimal number of 30 digits like the followin?</p>
  
  <blockquote>
    <p>8c6f78ac23b4a7b8c0182d7a89e9b1</p>
  </blockquote>