How to hide JS code from visitors who came from Yandex search?

Question

JavaScript

Yandex began to lower sites in positions for clickanders, Google doesn’t have such crap and it’s unlikely to happen.
Actually the question is:
How to hide the JS code of the clickander from Yandex, who are sitting with the mob. devices?
UPD. You can make the task easier and just hide the clickander code from all mobs. users, but this is highly undesirable.

Answer 1

You can determine that this is a bot and not show for it.
How to check if the robot belongs to Yandex