Which coding languages are you familiar with?
The interviewer is looking for evidence of continued learning and improvement. Your desire and willingness to expand your knowledge into different areas of technology is something that will make you a stand out candidate. Discuss the coding languages you are most familiar with and be sure to ask the interviewer if they are looking for any specific coding languages. You want to have the opportunity to address any potential shortcomings in your experience right away.
"I began my current position with very minimal coding skills. I can confidently say that I now have intermediate coding skills - primarily in HTML, CSS and more recently, JavaScript. I'm largely self-taught and started to learn as a hobby to build digital systems on the weekend. I've noticed over the last five years that this knowledge is becoming particularly valuable in my day-to-day work. Are there any coding languages you are specifically looking for?"