Which JavaScript method converts to base 10

Question

I've read on JavaScript number method toString() and how it can be used to convert from base 10. But I want to know if there's a way of converting back to base 10 without the long step I took in my code.
https://code.sololearn.com/WsaTCiR6VKUQ/?ref=app

Answer 1

Please look at the code. Hope it helps you 😉
https://code.sololearn.com/W2MbX2MpQpbI/?ref=app

Answer 2

TheWh¡teCat and Martin Taylor thanks for the knowledge. I'll implement it after studying my regular expression lessons.