JavaScript timer Tutorial : setTimeout and clearTimeout

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What is timer?

Timer is a device which fires an event after a preset time interval. They are usually a down counter, i.e. a counter which counts from a preset positive number towards zero. When count reaches to zero it fires an event to start. After that the counter goes into idol state and remains idol until user again sets an interval to reactivate it.
In JavaScript there is an inbuilt timer function setTimeout().  more...