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Developer Tries 'Predict-Then-Diff' Method for a Week to Audit AI Code Output

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A developer spent a week testing a technique called 'predict-then-diff,' which requires writing down expected AI output before viewing it, then comparing the two to identify knowledge gaps. The experiment, inspired by a comment thread debate about AI stunting junior developers' judgment, revealed that the developer had been passively accepting AI-generated code rather than critically evaluating it. Key moments included catching a silent error-handling flaw in networking code that would likely have gone unnoticed without the prior prediction step. The developer also discovered that their own instincts sometimes produced worse code than the AI, such as predicting a force-unwrap where the AI correctly used a guard clause. The method proved uncomfortable but effective, turning passive code review into an active reasoning exercise.

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