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comment The difference between “concurrent” and “parallel” execution?
By "within the same time frame", I don't necessarily mean "simultaneously", just that the overall time frames during which they occur overlap. This can be achieved in parallel (e.g. two processor cores, each executing one of the tasks), but it can also be achieved by completely serializing the execution (do task 1 first, remember the outcome, then do task 2, then report both), or by chopping both up and interleaving the chunks. The latter is what JS does.
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