In lisp, "unless" is a great way to signal that there will not be a dual branch. Similarly, they have "when" for the positive case only. They also have the ad

In lisp, "unless" is a great way to signal that there will not be a dual branch. Similarly, they have "when" for the positive case only. They also have the advantage of not needing a "progn" segment if you want to do more than 1 thing on the case that they are "true". I confess at first I thought they were somewhat superfluous, but they are more readable now that I'm used to them. Completely agreed on it being stylistic, mainly.