On Mon, Aug 3, 2015 at 12:04 AM, Peter Uhnák <i.uh...@gmail.com> wrote: >> (a b c) = (b a c) if a = b >> >> (a b c) < (b a c) if a < b >> The semantics are well defined.
A comparison between sequenceable collections compares each element in sequence. This makes intutive sense. > Since you mentioned JavaScript, you should know that you can't compare > arrays with ==, because it does object comparison. I don't understand the introduction of == to the argument. Its not mentioned previously. >> No. Sorted collection maintains order of its elements, and I'm talking >> about order on [the set of] sequencable collections > > This will make sense only if the objects have overriden their #=. It seems okay to me for the user to be responsible for ensuring elements put into SequenceableCollection can be compared. > Which also means that it is not very useful to use #<, because you can't > define order without overriding #=. > > Compare it to sorting a collection, where you can either do #sorted, which > will do "a <= b" by default, but you can still do #sorted: and specify the > sort order, ditto with PluggableDictionary etc. > So if anything, it would make more sense to be able to block-based testing > (without relying on #<), because more often then not you will have your > values wrapped in some (bigger) objects. > > And finally "Because in almost every programming language..." is not an > argument. Learning things from other languages *is* a reasonable argument, but it should not be the major consideration. cheers -ben > You could argue that "1 + 2 * 3" should return "7", because that's how every > language does it and that's how mathematicians did it for thousands of > years. And yet Smalltalk happily returns "9" and yet it makes sense, and > some could argue that it's even better. > > Peter > > On Sun, Aug 2, 2015 at 4:59 PM, Alexandre Bergel <alexandre.ber...@me.com> > wrote: >> >> > I'd say it is questonable if SequenceableCollections should be >> > comparable by default. >> >> +1 >> >> Alexandre >> -- >> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: >> Alexandre Bergel http://www.bergel.eu >> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. >> >> >> >> >
