def prod(xs, ys):
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The first benefit is that it’s a lot easier to make our code glitchless. Every time we change the input, we make one recursive pass over all nodes, updating them to their new values. As long as we don’t change the input during that pass, all of the nodes will see inputs that are consistent with each other. In single-threaded runtimes like JavaScript, this condition is very easy to achieve, and even if we introduce concurrency, we only need simple locking primitives to ensure that we wait until the pass is finished before making changes to the inputs.
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It has been a week since the government said the Portsmouth-based Type 45 destroyer would be deployed, but it is still at dock and the ship is likely to take another five days or more to reach its destination.