BytesCounter calculate the bytes of input stream.

BytesCounterByName calculate the bytes of input stream.

BytesCounterByNameSlice count bytes from filename slice returns countMap, total , errs.

CounterByNameSlice abstract func to conduct slice counter.

LineCounter can be used to count file N lines.

LineCounterByName count lines from file.

LineCounterByNameSlice count lines from filename slice returns countMap, total , errs.