Generator JS Yield Explorer

The Generator JS Yield Explorer helps developers and educators reason about the control flow of JavaScript generator functions without executing real side effects. It accepts a generator function as code_snippet and a chosen scenario to illustrate how yield pauses and how next() resumes with optional input values. The tool produces a deterministic execution trace that shows yielded values, done flags, and the effects of throwing exceptions into the generator. It also supports delegated iteration with yield* and a sandboxed mode for exploring async generators in limited form. The primary value is in clarifying how values pass into a generator, how control returns to the caller, and how the final return value is produced. Use cases include teaching the generator protocol, debugging complex yield pipelines, and interview preparation with concrete step-by-step demonstrations. Core features include an input surface for code, scenario selection, and an execution trace that can be consumed by downstream AI agents for validation. The tool aims to be language-feature focused, reproducible, and suitable for education, code reviews, and automated assessment workflows.