Ticket #0002222

Summary	Make EXCLUDE modify its argument, rename INTERSECT=>INTERSECTION
Description	I wanted to remove some items from a set, and realized I didn't know if EXCLUDE modified its argument or not. It sounds transitive, and transitive words like that tend to modify. Consider >> head insert [a b c] [d e f] == [d e f a b c] But exclude does not modify: >> foo: [a b c d e f] == [a b c d e f] >> exclude foo [b e f] == [a c d] >> foo == [a b c d e f] If the word was EXCLUSION it wouldn't seem as odd. Or even more clear, EXCLUSION-OF. INTERSECT has the same problem, and could similarly be solved with INTERSECTION or INTERSECTION-OF. Then INTERSECT could modify. In trying to complete the set we'd wind up with: INTERSECTION-OF, UNION-OF, EXCLUSION-OF, DIFFERENCE-OF As parallels to their transitive forms: INTERSECT, UNITE, EXCLUDE, DIFFERENTIATE (?) However, differentiate sounds like Calculus, and I can't think of a better word. And really, having both sets is probably excessive. The simplest solution would seem to be to make EXCLUDE the only verb form, and if you want a copying version make the copy yourself (as one has to do with INSERT and APPEND and other operations). Then just rename INTERSECT to INTERSECTION and call it done.
Example code

Assigned to	n/a	Fixed in	-	Last Update	17-Jul-2015 15:57