Re: junctions as indicies
David Christensen writes:
I'm looking in S09, and reading about junctions. It seems to me that
if we have a junction $j which we use to index into an array or a hash,
it should DWIM and return a junction of the corresponding values.
@ar=[1..10];
%hash=(a=1,b=4,c=7);
$j=1|2|3;
$k=a|c;
$u = @ar[$j]; # 2|3|4
$v = %hash{$k}; # 1|7
Does this make sense to others?
Well, if we replaced @ar[$j] with, say, @ar.get($j), what you're
proposing happens automatically. So I think that it's the right thing
to do.
Luke
Re: junctions as indicies
--- David Christensen [EMAIL PROTECTED] wrote:
I'm looking in S09, and reading about junctions. It seems to me
that if we have a junction $j which we use to index into an array
or a hash, it should DWIM and return a junction of the corresponding
values.
@ar=[1..10];
%hash=(a=1,b=4,c=7);
$j=1|2|3;
$k=a|c;
$u = @ar[$j]; # 2|3|4
$v = %hash{$k}; # 1|7
Does this make sense to others?
David
Maybe, but I don't like returning junctures in those cases unless you
*explicitly* ask for it. I'd rather the default be the arbitrary lists
returned, or whatever fits the context. How about
@ar=[a..z];
%hash=(a=1,b=4,c=7);
$j=1|2|3;
$k=a|c;
@u = @ar[$j];# (b..d)
%u = @ar[$j].kv; # (1='b',2='c',3='d')
$u = @ar[$j];# \(b..d)
$ju = juncture @ar[$j]; # 'b'|'c'|'d'
@v = %hash{$k}; # (1,7)
%v = %hash{$k}.kv; # (a=1,c=7)
$v = %hash{$k}; # \(1,7)
$jv = juncture %hash{$k}; # 1|7
Am I way off base here?
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Re: junctions as indicies
Paul Hodges writes: Maybe, but I don't like returning junctures in those cases unless you *explicitly* ask for it. I'd rather the default be the arbitrary lists returned, or whatever fits the context. How about @ar=[a..z]; %hash=(a=1,b=4,c=7); $j=1|2|3; @j = (1,2,3); $k=a|c; @k = a c; @u = @ar[$j];# (b..d) @u = @[EMAIL PROTECTED]; etc. Perl can indeed slice using ordinary lists. Another problem with using junctions for this is that they're unordered, and you're expecting ordered results back. Luke
Re: junctions as indicies
Paul Hodges wrote:
--- David Christensen [EMAIL PROTECTED] wrote:
I'm looking in S09, and reading about junctions. It seems to me
that if we have a junction $j which we use to index into an array
or a hash, it should DWIM and return a junction of the corresponding
values.
@ar=[1..10];
%hash=(a=1,b=4,c=7);
$j=1|2|3;
$k=a|c;
$u = @ar[$j]; # 2|3|4
$v = %hash{$k}; # 1|7
Does this make sense to others?
David
Maybe, but I don't like returning junctures in those cases unless you
*explicitly* ask for it. I'd rather the default be the arbitrary lists
returned, or whatever fits the context. How about
@ar=[a..z];
%hash=(a=1,b=4,c=7);
$j=1|2|3;
$k=a|c;
@u = @ar[$j];# (b..d)
%u = @ar[$j].kv; # (1='b',2='c',3='d')
$u = @ar[$j];# \(b..d)
$ju = juncture @ar[$j]; # 'b'|'c'|'d'
@v = %hash{$k}; # (1,7)
%v = %hash{$k}.kv; # (a=1,c=7)
$v = %hash{$k}; # \(1,7)
$jv = juncture %hash{$k}; # 1|7
Am I way off base here?
What would you propose
@v[all(any(4,5),one(1,2,3),none(7,8,9))]
return?
-- Rod Adams
