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美方派出先进的海上反潜巡逻机，与包括“德纳”号在内的伊朗海军舰艇进行联合演习，究竟是巧合，还是有意为之，五角大楼并未对此作出回应。，更多细节参见heLLoword翻译
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Part of the value of push-based systems is that each node only needs to keep track of its own dependencies and dependents, which makes analysing each node locally easy, but analysing the system as a whole hard. In the extreme case, you might dynamically create and destroy nodes in the tree depending on previous values — this doesn’t make sense for our spreadsheet analogy, but is essentially what’s happening with RxJS’s switchMap operator. Essentially, the more dynamism we want in our system, the harder it is to achieve efficient updates, and the more we want efficient updates, the more we need to specify our dependency graphs up-front.
environment captures the function's free variables at the point of definition.