title: How to move first element to the end of array
body: <p>What is the best way to move the first element of the array till the end of this same array?</p>
  
  <p>ie: <code>[a,b,c,d]</code></p>
  
  <p>"Some operation"</p>
  
  <p>result: <code>[b,c,d,a]</code></p>
  
  <p>What should this "Some operation" be?</p>