Worked on the cfug/dart.cn repository to enhance documentation accuracy for Dart learners and contributors. Focused on correcting a code example involving Dart collection for-loops, the work addressed a mismatch between the commented sample output and the actual assertion in the documentation. By aligning these elements, the update improved clarity and reduced potential confusion for readers. The technical approach involved careful code example correction and attention to documentation detail, utilizing Dart as the primary language. This targeted fix strengthened the reliability of the Dart.cn documentation, ensuring that example outputs accurately reflect expected behavior and supporting a more consistent learning experience.