Scaffolding Autocomplete: Improving Guidance for Learners using Generative Code Suggestions

Abstract

Modern programming tools use generative AI (GenAI) to suggest code to the user as they type, interrupting their problem-solving behavior and undermining the development of their programming critical thinking skills. In this paper, we present a scaffolded programming exercise designed to support student differentiation between good and bad GenAI code suggestions based on negative expertise–that identifying why an answer is wrong is part of developing conceptual knowledge. We compare a version of the tool that showed one suggestion (correct or not), to a version that showed three suggestions (one of which was correct). We present results on performance and error rates as well as qualitative findings centered on Pintrich and DeGroot’s theory of self-regulation. Students reported that the single suggestion version better aligned with industry tools and presented a lower cognitive load. Students also reported that the multiple suggestion version caused them to slow down and think critically about the line under consideration, the overall purpose of the code, and the benefits of planning.