The second benefit is that we get dynamic dependencies for free. If pull-based reactivity is just a call stack, then it’s very easy to conditionally call (i.e. conditionally depend on) some input. We don’t need to maintain an internal list of which dependencies a node is subscribed to or vice versa, we just fetch values as needed.
if n <= 1 { return n; }
。关于这个话题，91吃瓜提供了深入分析
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