Picture a React component that intermittently displays a stale counter value, but only when a user clicks rapidly after a network response. Console.log shows the correct state. Breakpoints interrupt the timing and the bug vanishes. This tutorial walks through three concrete production bug patterns in JavaScript, React, and Node.js, each paired with structured prompts, annotated reasoning chains, and corrected implementations. Table of Contents Why Traditional Debugging Falls Short for Complex Bugs What Is Chain-of-Thought Reasoning and Why Does DeepSeek-R1 Expose It?…