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Someone told me that when you use setTimeout you must clear it with clearTimeout. I can understand before the timeout runs out, but why after? Or is it untrue?
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No, you don't need to use clearTimeout if you intend for the timeout to be executed. The clearTimeout method is only used to stop timeouts from being executed. You can stop a timeout even if it has a time of 0 ms, because it won't be executed until you exit your function and return the control to the browser.
Using SetTimeout Inside Of A React Component Is Easy Enough As It's Just A Regular JavaScript Method.,And An Example Of Clearing SetTimeout Inside Of A React Class Component:,Above All, It's Important That You Clear Timers, Otherwise You Could Experience Errors In Your Code.
clearTimeout() inside setTimeout() method not working in JS It does "work", but your logic is incorrect. After you called clearTimeout you are calling setTimeout again. Instead of calling clearTimeout you should just exit the function.
You need to pass the amount of time to wait for in milliseconds , which means to wait for one second, you need to pass one thousand milliseconds . To cancel a setTimeout() method from running, you need to use the clearTimeout() method, passing the ID value returned when you call the setTimeout() method.
It's not true - there's no harm in clearing a timeout after it has finished, but it's not necessary.
Per the specification:
If handle does not identify an entry in the list of active timers of the WindowOrWorkerGlobalScope object on which [clearTimeout] was invoked, the method does nothing.
In other words, it's a no-op; nothing happens, and no error will be thrown.
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