Did we read the same thing? How can an "ETL" that he uses as example be just a "function or class"? If he meant simply function, then, you'd have 4 classes (ETL

Did we read the same thing? How can an "ETL" that he uses as example be just a "function or class"? If he meant simply function, then, you'd have 4 classes (ETL, E, T, L) each doing "one thing" and his entire argument would be moot.