[racket] member et al.

Yes, but this is weird in the opposite way:

Welcome to DrRacket, version 5.0.2 [3m].
Language: Beginning Student; memory limit: 128 MB.
> (member? 1 (list 2 3 4 1))
true
> (member 1 (list 2 3 4 1))
true
>


On Thu, Nov 11, 2010 at 10:36 AM, Matthias Felleisen
<matthias at ccs.neu.edu> wrote:
>
> 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.mccarthy at 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 <samth at ccs.neu.edu>
> wrote:
>> On Thu, Nov 11, 2...
>
> --
> Jay McCarthy <jay at cs.byu.edu>
> Assistant Professor / Brigham Young University
> http://faculty.cs.byu.edu/~jay
>
> "The glory of God is Intelligence" - D&C 93
>
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Nadeem Abdul Hamid
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Berry College
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