Worked on the apache/echarts repository to improve the clarity and accuracy of data iteration documentation, specifically focusing on the each() method in DataStore.ts and SeriesData.ts. Addressed a documentation bug by updating code examples to demonstrate both single numerical index and array-based usage, ensuring alignment with the method’s intended functionality. This targeted fix, implemented in TypeScript, enhanced the reproducibility and precision of API usage for contributors. Emphasized code examples and documentation skills to strengthen onboarding and reduce misusage, while adhering to established repository conventions and coding standards to maintain consistency and support ongoing maintainability of the codebase.