> Welcome to DrRacket, version 5.0.99.2--2010-11-11(686ec83/g) [3m]. > Language: Beginning Student. > > (member? 1 (list 2 3 4 1)) > true
On Nov 11, 2010, at 10:32 AM, Shriram Krishnamurthi wrote: > In fact, I proposed adding the ? forms of these functions where the new ones > are strictly boolean. > > These are essential for the SLs since the standard versions are useless due > to the true/false tests in the language. > > >> On Nov 11, 2010 6:44 AM, "Jay McCarthy" <jay.mccar...@gmail.com> wrote: >> >> I agree with Mark. I often write ? versions of functions like member >> in my code when I write it the first time to show the "predicate >> intent". >> >> Another important case is when you don't want internal values to >> "escape" to the client because you forget that member/and/etc return >> the thing, not #t. >> >> Jay >> >> On Thu, Nov 11, 2010 at 6:07 AM, Sam Tobin-Hochstadt <sa...@ccs.neu.edu> >> wrote: >> > On Thu, Nov 11, 2... >> >> -- >> Jay McCarthy <j...@cs.byu.edu> >> Assistant Professor / Brigham Young University >> http://faculty.cs.byu.edu/~jay >> >> "The glory of God is Intelligence" - D&C 93 >> _________________________________________________ >> For list-related administrative tasks: >> http://... >> > > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users
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