Each iteration in the above code runs much faster than 1ms.
But it doesn't actually matters, because as Calin said this is an unaccepted way of implementing sleep function, because it blocks main thread and loads CPU at 100% for no profit.
Btw, setTimeout(fn, 2000) doesn't mean that fn will be called exactly after 2s. It'll be exectuted at least after 2000ms.
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This only works if each iteration runs for a millisecond, doesn't it?
Each iteration in the above code runs much faster than 1ms.
But it doesn't actually matters, because as Calin said this is an unaccepted way of implementing
sleepfunction, because it blocks main thread and loads CPU at 100% for no profit.Btw,
setTimeout(fn, 2000)doesn't mean thatfnwill be called exactly after 2s. It'll be exectuted at least after 2000ms.