I struggle to get the reason of the copyright note of the first example: // Copyright 2015 Google Inc. Does this mean that this code snippet was written d

I struggle to get the reason of the copyright note of the first example: // Copyright 2015 Google Inc. Does this mean that this code snippet was written during paid development time at Google? Also, why is only the first (failing) attempt marked with a Google copyright, but not the second (actually working) version of this code snippet?