The series of Command objects generated by the pipeline is then run by an interpreter using runEffect(checkoutFlow(cartSummary)). Because our business logic consists of pure functions that interact with the world only through data, we can record those interactions simply by adding a few hooks for services like OpenTelemetry. And if we can record them, we can replay them deterministically. Best of all, there’s no need to mock a single database or external service.
Reddit has preserved "human authenticity" says Jen Wong
，更多细节参见搜狗输入法2026
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if (right - left <= 1) return; // 只有一个元素，无需排序