Re: Printing from three arrays

Another alternative to looping is to use the glob built-in.

johngg@shiraz:~/perl/Monks$ perl -Mstrict -Mwarnings -E '
my @arr1 = qw{ 1 2 3 };
my @arr2 = q{a} .. q{g};
my @arr3 = qw{ I II III };

my $globStr
   = qq{{@{ [ join q{,}, @arr1 ] }}}
   . qq{{@{ [ join q{,}, @arr2 ] }}}
   . qq{{@{ [ join q{,}, @arr3 ] }}};
say $globStr;

say for glob $globStr;'
{1,2,3}{a,b,c,d,e,f,g}{I,II,III}
1aI
1aII
1aIII
1bI
1bII
1bIII
1cI
1cII
1cIII
1dI
1dII
1dIII
1eI
1eII
1eIII
1fI
1fII
1fIII
1gI
1gII
1gIII
2aI
2aII
2aIII
2bI
2bII
2bIII
2cI
2cII
2cIII
2dI
2dII
2dIII
2eI
2eII
2eIII
2fI
2fII
2fIII
2gI
2gII
2gIII
3aI
3aII
3aIII
3bI
3bII
3bIII
3cI
3cII
3cIII
3dI
3dII
3dIII
3eI
3eII
3eIII
3fI
3fII
3fIII
3gI
3gII
3gIII
[download]

I hope this is of interest.

Update : AnomalousMonk quite rightly points out that I'm the idiot who didn't read the question properly, a failing that has dogged me since O- and A-levels at school :-(

Getting the left-hand value to circulate the fastest and inserting the required commas involves some jiggery-pokery to insert marker text into a re-ordered $globStr and a split, reverse and join in a map for each string generated by glob. Probably more trouble than it's worth.

johngg@shiraz:~/perl/Monks$ perl -Mstrict -Mwarnings -E '
my @arr1 = qw{ 1 2 3 };
my @arr2 = q{a} .. q{g};
my @arr3 = qw{ I II III };

my $globStr
   = qq{{@{ [ join q{,}, @arr3 ] }}}
   .  q{__}
   . qq{{@{ [ join q{,}, @arr2 ] }}}
   .  q{__}
   . qq{{@{ [ join q{,}, @arr1 ] }}};
say $globStr;

say for
   map { join q{,}, reverse split m{__} }
   glob $globStr;'
{I,II,III}__{a,b,c,d,e,f,g}__{1,2,3}
1,a,I
2,a,I
3,a,I
1,b,I
2,b,I
3,b,I
1,c,I
2,c,I
3,c,I
1,d,I
2,d,I
3,d,I
1,e,I
2,e,I
3,e,I
1,f,I
2,f,I
3,f,I
1,g,I
2,g,I
3,g,I
1,a,II
2,a,II
3,a,II
1,b,II
2,b,II
3,b,II
1,c,II
2,c,II
3,c,II
1,d,II
2,d,II
3,d,II
1,e,II
2,e,II
3,e,II
1,f,II
2,f,II
3,f,II
1,g,II
2,g,II
3,g,II
1,a,III
2,a,III
3,a,III
1,b,III
2,b,III
3,b,III
1,c,III
2,c,III
3,c,III
1,d,III
2,d,III
3,d,III
1,e,III
2,e,III
3,e,III
1,f,III
2,f,III
3,f,III
1,g,III
2,g,III
3,g,III
[download]

Cheers,

JohnGG

Comment on Re: Printing from three arrays Select or Download Code

Replies are listed 'Best First'.
Re^2: Printing from three arrays by AnomalousMonk (Archbishop) on Sep 26, 2019 at 18:20 UTC
IIRC, glob iterates most slowly over its first (leftmost) iteration group, `{1,2,3}` in this case, and more rapidly over each succeeding iteration group, so that the the last (rightmost) group `{I,II,III}` iterates most quickly. This is the behavior I see in the output of your example code: the first (leftmost, arabic-number) field or column of each `"1aI"` output record/string changes most slowly, the second (middle, alpha) changes more quickly, and the third (rightmost, roman-number) column changes fastest. However, oysterperl, as shown in the example of desired output in the OP, seems to want the first (leftmost, arabic-number) column to change most quickly, the second (alpha) column to change most slowly, and the third (roman-number) column to change at an intermediate rate. Is it possible to produce this result with a `glob` solution? (The OPed example output also has commas separating the columns, but this is easily done with a `glob` template.) Give a man a fish: `<%-{-{-{-<`	[reply] [d/l] [select]
Re^3: Printing from three arrays by FreeBeerReekingMonk (Deacon) on Sep 26, 2019 at 22:09 UTC
I checked the glob page, and I could not find something that would make it change it's ways, so you would need to split and join it :( `perl -e '@_=split(/=/, $_) and print join(", " ,@_[2,0,1]),"\n" for glob "{a,b,c}={I,II,III}={1,2,3,4}"'` it's cumbersome, though. I tried something with unshift pop but it was longer. `perl -E '@_=split /=/ and unshift(@_,pop @_) and say join ", ", @_ for glob "{a,b,c}={I,II,III}={1,2,3,4}"'` `perl -E '@_=split /=/ and say join ", ", unshift(@_, pop @_) && @_ for glob "{a,b,c}={I,II,III}={1,2,3,4}"'`	[reply] [d/l] [select]
Re^4: Printing from three arrays by AnomalousMonk (Archbishop) on Sep 26, 2019 at 23:36 UTC
Not really much (if any) better: `c:\@Work\Perl\monks>perl -wMstrict -le "use 5.014; ;; print s{\A(.+?),(.+?),(.+?)}{$3,$1,$2}xmsr for glob '{a,b,c},{I,II,III},{1,2,3,4}'; "` [download] (I won't show the output; it's as expected.) Give a man a fish: `<%-{-{-{-<`	[reply] [d/l] [select]


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