On Sun, Mar 07, 2010 at 03:31:15PM -0500, Josh Grams wrote: > Note also that global variables aren't frowned upon in Forth as they are > in other languages. Certainly you need to be aware of when they are a > problem (and vsum is probably one of these places).
It also depends on the approach to programming. If you are Chuck Moore, or someone from that school, you keep the whole application in your head, and ruthlessly eliminate as much complexity (and requirements) as is necessary to do that, and don't reuse code, only concepts, then global variables are much less of a problem than for other people. OTOH, if you have more conventional goals in mind, like writing an extendible program or a reusable component, and let application complexity grow as far as your programming approach and customer budget lets it, then global variables become a significant burden, because they make a program much harder to understand and maintain. > But the general philosophy is that since everything is a word, it's fine > to use a global variable to begin with. If and when you need something > more sophisticated, replace the variable with a more sophisticated word. Yes, that helps, and I have done that when extending a program in new directions, but the result is still messy. BTW, these kinds of general discussions are not very Gforth-specific and would see a wider audience in comp.lang.forth. - anton
