> Another big thing that APL made me realise is that the Boolean values True/False and the integers 1/0 are tightly connected Amen! It's of course also a C lan

> Another big thing that APL made me realise is that the Boolean values True/False and the integers 1/0 are tightly connected Amen! It's of course also a C language tenet, and a great one. Life is so much simpler and more flexible when true and false are 1 and 0. It drives me crazy when I need to use a language where the logical operators only work on bools and the arithmetic only on ints, or some coercions work and others don't. When I incorporate somebody else's code into mine, first thing I get rid of is anything called "bool", a completely useless type. (as a nice side effect, that frees up the bool keyword for Boolean sets, which are quite useful) a disappointment with unix is that process retval has this a bit backward, 0 is success, nonzero is failure (probably because errno does want for more bits than a singleton) but it's easily enough remedied with a ! I did love everything else about APL for the brief time I used it long ago (except the difficulty of entering the symbols)