[tompko]

It depends entirely on the senior dev. If it were me I'd be glad for the pointers from someone more experience with the language than me. Even the most junior of devs probably knows more about some particular subject than I do, and I'm always willing to learn.

On the other hand some people act is if their code comes straight from God on High and flows into this world through their fingers and may not be touched by mere mortals like the rest of us. In that case you might as well give up now.

The fact he's assigned you to manage and extend them suggests he might be nearer to the first approach, in which case just have a talk with him. You'll hopefully find that he'll be open to having you improve/rewrite them while he learns his mistakes.