The SkipLast operator modifies the source sequence to remove the specified number of elements from the end of the sequence. Because SkipLast does not know beforehand which values are the last, it will not emit any notifications until at least the specified number of subsequent elements is received. This means that SkipLast has the practical effect of delaying notifications from the source sequence by the specified number of values to skip.

Tip

SkipLast can often be used when you need to impose a delay in the source sequence using number of elements, rather than a time interval.