text: // 'Stolen' from the Mozilla's developers docs.
  
  console.log ([1, 2, 3, 4, 5].copyWithin (0, 3));
  // [4, 5, 3, 4, 5]
  
  console.log ([1, 2, 3, 4, 5].copyWithin (0, 3, 4));
  // [4, 2, 3, 4, 5]
  
  console.log ([1, 2, 3, 4, 5].copyWithin (0, -2, -1));
  // [4, 2, 3, 4, 5]
  
  