Stale API Responses Can Silently Overwrite Correct UI Data, Dev Warns

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A software developer has highlighted a subtle frontend bug where a successful API response updates the wrong screen because an earlier request finishes after a newer one. The issue arises in scenarios like trading dashboards, where rapid instrument switching can cause an outdated result to overwrite the current view, even though no network error occurred. The proposed fix uses object identity — assigning a unique ticket to each selection and validating it before committing any result to the UI. The developer demonstrated the approach using a small in-memory JavaScript session function, tested with Node's built-in test runner across four deliberate out-of-order completion scenarios. The key takeaway is that a successful response should only be allowed to update the screen if its originating request still owns the current UI state.

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