How would you decide which string is bigger?
3 u: 7 u: 'ӒAÁú'
1234 65 193 250
3 u: 7 u: 'abssdgasfgas'
97 98 115 115 100 103 97 115 102 103 97 115
+/3 u: 7 u: 'ӒAÁú'
1742
+/3 u: 7 u: 'abssdgasfgas'
1257
2011/10/30 Don Guinn <[email protected]>
> By "string" I assume you mean "literal". = only gives equal or not equal
> for literals. > and like give domain errors for literals. However, grade
> (/:) does perform a sort on literals.
>
> ASCII literals work pretty well with grade; however, if any Unicode are in
> the literal things get messy. When I need to sort literals that may include
> Unicode I use the u: verb as below. This also converts the literal to
> numeric so all comparisons work.
>
> 3 u: 7 u: 'ӒA'
> 1234 65
>
> On Sun, Oct 30, 2011 at 2:58 PM, Andrew Pennebaker <
> [email protected]> wrote:
>
> > I made a general cmp function for arbitrary data types. Let me know if J
> > has a built-in function with the same API.
> >
> > https://github.com/mcandre/mcandre/blob/master/j/cmp.j
> >
> > Example usage:
> >
> > 1 cmp 2
> > -1
> > 2 cmp 1
> > 1
> > 1 cmp 1
> > 0
> > 'abc' cmp 'def'
> > -1
> > 'def' cmp 'abc'
> > 1
> > 'abc' cmp 'abc'
> > 0
> > 1 lt 2
> > 1
> > 2 lt 1
> > 0
> > 1 lte 2
> > 1
> > 1 lte 1
> > 1
> > 'abc' gte 'def'
> > 0
> > 'abc' gte 'abb'
> > 1
> >
> > Cheers,
> >
> > Andrew Pennebaker
> > www.yellosoft.us
> >
> > On Sun, Oct 30, 2011 at 4:29 PM, Andrew Pennebaker <
> > [email protected]> wrote:
> >
> > > Is there a dyad that returns -1 for string x less than string y, 1 for
> x
> > > greater than y, and 0 for x equals y?
> > >
> > > -: Almost does this, but it only tests equality; it's not specific
> enough
> > > to tell you whether x or y is greater. Instead it just returns 0 for
> not
> > > equal and 1 for equal.
> > >
> > > The compare dyad almost does this, but with an API with complexity on
> the
> > > order of diff or subversion.
> > >
> > > 'abc' compare 'def'
> > > 0 [0] abc
> > > 1 [0] def
> > >
> > > 'abc' compare 'abc'
> > > no difference
> > >
> > > In a conditional you would have to use (('abc' compare 'abc') compare
> 'no
> > > difference') compare 'no difference' ad infinitum just to see if there
> > > was 'no difference' in the original compare!
> > >
> > > Cheers,
> > >
> > > Andrew Pennebaker
> > > www.yellosoft.us
> > >
> > ----------------------------------------------------------------------
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> >
> ----------------------------------------------------------------------
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>
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