You are always very welcome to post a question in the Apple Support Communities - and specifically here - for advice and guidance in using your iPad, or its many features.
Contrary to a preceding comment, subject to observing the Terms of Use that govern participation participation within ASC (you’ll find a link at the bottom of this page), you are free to ask almost any question that you like. It follows that questions relating to a product feature is perhaps more likely to elicit a helpful reply, but you are not limited or constrained in the questions that you may ask.
Please don’t be put off from asking a more specialist question. Your target audience may be more limited, but you may always get lucky.
As to your specific question - there are many code editors to be found in the Apple App Store. Perhaps one of better alternatives is Kodex:
https://apps.apple.com/gb/app/kodex/id1038574481