Programming with data frames for everyday data items

Processing everyday data items such as dollar amounts, time, dates, and account numbers constitutes a significant portion of real-world computer applications. Programmers involved with everyday data items confront the drudgery of writing routines to recognize, validate, transform, store, retrieve, manipulate, and display these items and also the challenge to develop user-friendly data-entry systems and insure data integrity. They usually meet these challenges using various and sundry ad hoc techniques.