How would you guide a new team member that doesn't know anything about qork

A new member joined our team, and I was tasked to guide since I am the most junior in the team. Newbie had 2 years development experience previously, so I didn't think it'll take long to guide the newbie into the code base, maybe even be able to learn from the newbie.

The problem is the newbie actually doesn't know how to do alot of things. While I don't have an issue with guiding, I'm actually spending a good portion of my work hours (around 4hours) doing so.

It's alot of handholding required, as the newbie is not even familar with how functions in JavaScript work. Without guidance, the newbie wouldn't know what to code.

My question is, if anyone has any experience working with individuals like that, and how would you guide them / spend lesser time so that they are able to learn by themselves?