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Groups > comp.lang.javascript > #24995
| Newsgroups | comp.lang.javascript |
|---|---|
| Date | 2014-06-24 03:26 -0700 |
| References | <e8847026-67f9-417c-9166-d1368bb9a704@googlegroups.com> <b1668508-01ca-4844-8eb1-9d430f45fe05@googlegroups.com> |
| Message-ID | <dc68de25-f3f0-4e1a-8ea8-34420ca67321@googlegroups.com> (permalink) |
| Subject | Re: Bijective basechanger |
| From | jonas.thornvall@gmail.com |
Den tisdagen den 24:e juni 2014 kl. 00:29:57 UTC+2 skrev Scott Sauyet:
> jonas.thornvall@gmail.com wrote:
>
> > 10=A
>
> > 100=9A
>
> > 1000=99A
>
> > ...
>
> > 2000=199A
>
> > 2001=19A1
>
> > 2010=19AA
>
> > 2014=1A14
>
> >
>
> > 1091020134=????????? Brainteaser
>
> >
>
> > A generic basechanger for anybase is rather easy to accomplish, but i am
>
> > a bit stumped where to start with doing conversion into bijective bases,
>
> > i was thinking counting up the base multiples upto the number to
>
> > convert, and bone it out from there saving the differences. But i just
>
> > can't recall howto do it.
>
> >
>
> > Is there an easy obvious way todo this?
>
>
>
> Is this the sort of thing you're looking for?
>
>
>
> var zeroless = function(str) {return str.split("").reverse().map(
>
> (function() {
>
> var borrow = false;
>
> return function(ch, idx, arr) {
>
> ch = + ch;
>
> if (borrow) (ch = (ch == 0) ? 9: ch - 1);
>
> if (ch == 0 && idx == arr.length - 1) {return '';}
>
> borrow = (ch == 0 || ch == 9);
>
> return (ch == 0) ? 'A' : ch;
>
> };
>
> }())).reverse().join("");};
>
>
>
> zeroless("100"); //=> "9A"
>
> zeroless("2010"); //=> "19AA", etc.
>
>
>
> You could easily extend it to an arbitrary base (up to 35, I suppose),
>
> by adding a `base` parameter and replacing the 9's with `(base - 1)`
>
> and the `'A'` with `(base).toString(base + 1).toUpperCase()`.
>
>
>
> And by the way, this reports:
>
>
>
> zeroless("1091020134") //=> "A8AA1A134"
>
>
>
> Is there some point to this, or is it just a puzzle?
>
>
>
> -- Scott
Did you try convert it back?
I Think there is something wrong with your program reoccuring A can not happen.
Break it down 10,9,10,20,134=A,9,A,1A,134
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Bijective basechanger jonas.thornvall@gmail.com - 2014-06-17 06:42 -0700
Re: Bijective basechanger "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-06-17 12:08 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-17 13:23 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-17 13:24 -0700
Re: Bijective basechanger "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-06-17 13:54 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-17 14:07 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-17 14:15 -0700
Re: Bijective basechanger John Harris <niam@jghnorth.org.uk.invalid> - 2014-06-23 17:23 +0100
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-17 14:23 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-17 14:41 -0700
Re: Bijective basechanger "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-06-17 20:28 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-18 13:04 -0700
Re: Bijective basechanger "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-06-18 16:30 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-18 17:45 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-18 17:49 -0700
Re: Bijective basechanger "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-06-19 11:21 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-19 14:44 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-19 14:48 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-19 14:55 -0700
Re: Bijective basechanger "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-06-19 19:59 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-21 09:25 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-21 11:15 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-18 18:05 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-18 18:19 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-18 18:25 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-18 18:46 -0700
Re: Bijective basechanger "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-06-23 16:00 -0700
Re: Bijective basechanger "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2014-06-23 17:51 -0700
Re: Bijective basechanger John Harris <niam@jghnorth.org.uk.invalid> - 2014-06-23 17:18 +0100
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-23 11:27 -0700
Re: Bijective basechanger Scott Sauyet <scott.sauyet@gmail.com> - 2014-06-23 15:29 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-24 03:26 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-24 03:28 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-24 04:24 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-24 05:36 -0700
Re: Bijective basechanger Scott Sauyet <scott.sauyet@gmail.com> - 2014-06-24 13:05 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-24 14:13 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-25 05:36 -0700
Re: Bijective basechanger Scott Sauyet <scott.sauyet@gmail.com> - 2014-06-25 12:45 -0700
Re: Bijective basechanger Scott Sauyet <scott.sauyet@gmail.com> - 2014-06-25 13:15 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-07-01 02:39 -0700
Re: Bijective basechanger Scott Sauyet <scott.sauyet@gmail.com> - 2014-07-03 07:33 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-07-03 09:54 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-07-04 02:14 -0700
Re: Bijective basechanger Scott Sauyet <scott.sauyet@gmail.com> - 2014-07-05 12:12 -0700
Re: Bijective basechanger "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2014-07-05 22:19 +0200
Re: Bijective basechanger Scott Sauyet <scott.sauyet@gmail.com> - 2014-07-05 13:50 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-07-06 11:11 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-07-06 14:59 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-07-06 15:00 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-07-06 15:02 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-07-16 23:31 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-07-04 02:28 -0700
Re: Bijective basechanger Scott Sauyet <scott.sauyet@gmail.com> - 2014-07-05 12:14 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-25 22:38 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-24 03:32 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-24 03:44 -0700
Re: Bijective basechanger jonas.thornvall@gmail.com - 2014-06-24 11:10 -0700
Re: Bijective basechanger Scott Sauyet <scott.sauyet@gmail.com> - 2014-06-24 11:45 -0700
Re: Bijective basechanger "Chris M. Thomasson" <no@spam.invalid> - 2014-07-22 12:16 -0700
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