While you can pick up the very basics of JavaScript in a day, becoming truly good at it takes much longer. Think of it like ...

By the conclusion of the trans-Atlantic slave trade at the end of the 19th century, Europeans had enslaved and transported more than 12.5 million Africans.

This could be the final differentiator between Apple Maps and Google Maps. So give it when the new iOS rolls out, and then you can make your final decision.