www.delorie.com/gnu/docs/emacs-lisp-intro/emacs-lisp-intro_104.html

search

	Buy the book!

Programming in Emacs Lisp

5.5 optional Argument Exercise

Write an interactive function with an optional argument that tests whether its argument, a number, is greater or less than the value of fill-column, and tells you which, in a message. However, if you do not pass an argument to the function, use 56 as a default value.