I want to iterate the unique values of a hash, without poluting the code
with extra hash definition. Any better idea than

my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );

foreach ( sub{local $_={}; @{$_}{@_}=1; keys %{$_}}->(values %hash) ) {
say $_;
}

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* Origin: fsxNet Usenet Gateway (21:1/5)

"George" == George Bouras <[email protected]> writes:

George> I want to iterate the unique values of a hash, without poluting
George> the code with extra hash definition. Any better idea than

George> my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );

George> foreach ( sub{local $_={}; @{$_}{@_}=1; keys %{$_}}->(values
George> %hash) ) { say $_; }

Yes. Anything *but* that. You're not golfing here.

my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );
{
my %u;
@u{values %hash} = ();
print "$_\n" for sort keys %u;
}

And even *that* could use a comment or two for junior devs.

print "Just another Perl hacker,"; # the original
--
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 <[email protected]> <URL:http://www.stonehenge.com/merlyn/> Perl/Dart/Flutter consulting, Technical writing, Comedy, etc. etc.
Still trying to think of something clever for the fourth line of this .sig

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with <s1339k$rhi$[email protected]> George Bouras wrote:

I want to iterate the unique values of a hash, without poluting the
code with extra hash definition. Any better idea than

my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );

foreach ( sub{local $_={}; @{$_}{@_}=1; keys %{$_}}->(values %hash) )
{ say $_; }

By my books 'local $_={}' of yours is no different from 'my %foo'. IOW,
it's not fulfilling requirements "without ... definition" -- you're not
going 'local' for explicit effects of 'local' itself. Your code *is* foulfulling requirements, if I may.

--
Torvalds' goal for Linux is very simple: World Domination
Stallman's goal for GNU is even simpler: Freedom

--- SoupGate-Win32 v1.05
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El 23/2/21 a las 16:27, Randal L. Schwartz escribió:

"George" == George Bouras <[email protected]> writes:

George> I want to iterate the unique values of a hash, without poluting George> the code with extra hash definition. Any better idea than

George> my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );

George> foreach ( sub{local $_={}; @{$_}{@_}=1; keys %{$_}}->(values
George> %hash) ) { say $_; }

Yes. Anything *but* that. You're not golfing here.

my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );
{
my %u;
@u{values %hash} = ();
print "$_\n" for sort keys %u;
}

Doesn't this do the same?

my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );
my %v = reverse %hash;

for (keys %v){
print "$_\n";
}

And even *that* could use a comment or two for junior devs.

print "Just another Perl hacker,"; # the original

--
http://gamo.sdf-eu.org/
perl -E 'say "Press return to continue";'

--- SoupGate-Win32 v1.05
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gamo <[email protected]> writes:

El 23/2/21 a las 16:27, Randal L. Schwartz escribió:

"George" == George Bouras <[email protected]> writes:

George> I want to iterate the unique values of a hash, without poluting
George> the code with extra hash definition. Any better idea than

George> my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );

George> foreach ( sub{local $_={}; @{$_}{@_}=1; keys %{$_}}->(values
George> %hash) ) { say $_; }

Yes. Anything *but* that. You're not golfing here.

my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );
{
my %u;
@u{values %hash} = ();
print "$_\n" for sort keys %u;
}

Doesn't this do the same?

my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );
my %v = reverse %hash;

for (keys %v){
print "$_\n";
}

It's mostly a more contorted, functional equivalent. The difference is
that the output order of the loop is not defined.

--- SoupGate-Win32 v1.05
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El 24/2/21 a las 16:03, Rainer Weikusat escribió:

gamo <[email protected]> writes:

El 23/2/21 a las 16:27, Randal L. Schwartz escribió:

"George" == George Bouras <[email protected]> writes:

George> I want to iterate the unique values of a hash, without poluting
George> the code with extra hash definition. Any better idea than

George> my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );

George> foreach ( sub{local $_={}; @{$_}{@_}=1; keys %{$_}}->(values
George> %hash) ) { say $_; }

Yes. Anything *but* that. You're not golfing here.

my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );
{
my %u;
@u{values %hash} = ();
print "$_\n" for sort keys %u;
}

Doesn't this do the same?

my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );
my %v = reverse %hash;

for (keys %v){
print "$_\n";
}

It's mostly a more contorted, functional equivalent. The difference is
that the output order of the loop is not defined.

You have only to add 'sort' before 'keys', but the OP did not.

--
http://gamo.sdf-eu.org/
perl -E 'say "Press return to continue";'

--- SoupGate-Win32 v1.05
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Στις 24/2/2021 10:49 π.μ., ο/η Eric Pozharski έγραψε:

with <s1339k$rhi$[email protected]> George Bouras wrote:

I want to iterate the unique values of a hash, without poluting the
code with extra hash definition. Any better idea than

my %hash = ( k1=>'v1', k2=>'v1', k3=>'v2', k4=>'v2' );

foreach ( sub{local $_={}; @{$_}{@_}=1; keys %{$_}}->(values %hash) )
{ say $_; }

By my books 'local $_={}' of yours is no different from 'my %foo'. IOW,
it's not fulfilling requirements "without ... definition" -- you're not
going 'local' for explicit effects of 'local' itself. Your code *is* foulfulling requirements, if I may.

indeed !

--- SoupGate-Win32 v1.05
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