Throttle update to only occur one at a time - #2
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By using the callback to `setState`, updates are only run one at a time once the previous update has completely finished. Contrary to popular belief, `setState` is not necessarily synchronous.
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By using the callback to
setState, updates are only run one at a time once theprevious update has completely finished (ie; fully flushed to the DOM, which can take longer than it takes for the next
mousemoveevent to fire).Contrary to popular belief,
setStateis not necessarily synchronous.