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This is a simple, and therefore very common approach. Generally, most event systems, streams, and observables follow this rough pattern. Even promises/futures/async/await can be thought of as a one-time-only push-based reactive tree — each .then/.map/await call creates a listener to the previous step, and then when the initial promise resolves, the update is pushed through the rest of the system.
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Lex: FT's flagship investment column。关于这个话题，新收录的资料提供了深入分析
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Fire service refills penguin pools after heatwave