posted by Shriram Krishnamurthi
The other day, while discussing Church numerals in class, I pointed out that Racket could support Roman numeral in source programs. The essence of the idea is that, whenever an unbound identifier matches the syntax of a Roman numeral, it is automatically converted into the corresponding number.
The implementation of this is here. The test client best illustrates this in action. For instance, here is a valid test case:
The essence of the implementation is just this macro:
I(define MMMMM “that is especially delicious!”)
— steck, 23 November 2012
It’s a great setup for counters, too: (do ((i i …)) …)
— YeshuaAaron, 23 November 2012