When Returning 2 or more values from a Subroutine only the last varaible returns defined
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I'm currently writing a small Perl script to act as a cronjob.
The task of the Subroutinen is to check whether the file I'm writing to is a valid json file or not and to then proceed based on the return of this subroutine and the output of another Subroutine.
Even though I do return the multiple values in a list and then assign the result of the function to the list of variables that i want define, it only seams to work with the last value from the list.
I could just encapsulated the values with an array, but i want to knowe why the method i tried is not functioning as i expected.
(sorry for the bad formatting...)
#!/usr/bin/perl
use strict;
use warnings;
use JSON;
use Data::Dumper;
sub is_valid_json {
my $readJson = do {
open(my $readJson, "+<", "../data_out.json")
or die("Can't open $filename": $!n");
local $/;
<$readJson>
};
my $json = JSON->new;
eval {
my $result = $json->decode($readJson);
my $JsonValidationStatus = 1;
return($JsonValidationStatus,$readJson );
} or do {
warn "Failed to decode_json result";
print "mission failled";
my $JsonValidationStatus = 0;
return($JsonValidationStatus, $readJson);
};
}
my ($JsonValidationStatus, $readJson) = is_valid_json();
print "One:". Dumper "$JsonValidationStatusn";
print "Two:" . Dumper "$readJsonn";
print "n n n n";
ps. sorry forgot to provide the error message:
Use of uninitialized value $readJson in concatenation (.)
perl subroutine
asked Jan 4 at 15:00
Lost DemondragonLost Demondragon
287
add a comment |
I'm currently writing a small Perl script to act as a cronjob.
The task of the Subroutinen is to check whether the file I'm writing to is a valid json file or not and to then proceed based on the return of this subroutine and the output of another Subroutine.
Even though I do return the multiple values in a list and then assign the result of the function to the list of variables that i want define, it only seams to work with the last value from the list.
I could just encapsulated the values with an array, but i want to knowe why the method i tried is not functioning as i expected.
(sorry for the bad formatting...)
#!/usr/bin/perl
use strict;
use warnings;
use JSON;
use Data::Dumper;
sub is_valid_json {
my $readJson = do {
open(my $readJson, "+<", "../data_out.json")
or die("Can't open $filename": $!n");
local $/;
<$readJson>
};
my $json = JSON->new;
eval {
my $result = $json->decode($readJson);
my $JsonValidationStatus = 1;
return($JsonValidationStatus,$readJson );
} or do {
warn "Failed to decode_json result";
print "mission failled";
my $JsonValidationStatus = 0;
return($JsonValidationStatus, $readJson);
};
}
my ($JsonValidationStatus, $readJson) = is_valid_json();
print "One:". Dumper "$JsonValidationStatusn";
print "Two:" . Dumper "$readJsonn";
print "n n n n";
ps. sorry forgot to provide the error message:
Use of uninitialized value $readJson in concatenation (.)
perl subroutine
asked Jan 4 at 15:00
Lost DemondragonLost Demondragon
287
8
returninside anevalreturns from theeval, not the subroutine.
– Matt Jacob
Jan 4 at 15:05
now i just feel stupid... thanks anyway... should have known it better.
– Lost Demondragon
Jan 4 at 15:17
1
Irrelevant to your question, but I think you could use Data::Dumper more gracefully: print Data::Dumper->Dump([$JsonValidationStatus, $readJson], ['*One', '*Two']);
– Ed Grimm
Jan 6 at 0:27
Thankful for any help that might improve upon my code/coding style :D... Indeed i have to confess that you're way of writing is a lot more smoother and sexier. Am and Matt Jacob would you like to make you're coment the answer of this thread. I cant axept it if its just a coment, and posting the answer my self would be injust.
– Lost Demondragon
Jan 8 at 11:43
add a comment |
I'm currently writing a small Perl script to act as a cronjob.
The task of the Subroutinen is to check whether the file I'm writing to is a valid json file or not and to then proceed based on the return of this subroutine and the output of another Subroutine.
Even though I do return the multiple values in a list and then assign the result of the function to the list of variables that i want define, it only seams to work with the last value from the list.
I could just encapsulated the values with an array, but i want to knowe why the method i tried is not functioning as i expected.
(sorry for the bad formatting...)
#!/usr/bin/perl
use strict;
use warnings;
use JSON;
use Data::Dumper;
sub is_valid_json {
my $readJson = do {
open(my $readJson, "+<", "../data_out.json")
or die("Can't open $filename": $!n");
local $/;
<$readJson>
};
my $json = JSON->new;
eval {
my $result = $json->decode($readJson);
my $JsonValidationStatus = 1;
return($JsonValidationStatus,$readJson );
} or do {
warn "Failed to decode_json result";
print "mission failled";
my $JsonValidationStatus = 0;
return($JsonValidationStatus, $readJson);
};
}
my ($JsonValidationStatus, $readJson) = is_valid_json();
print "One:". Dumper "$JsonValidationStatusn";
print "Two:" . Dumper "$readJsonn";
print "n n n n";
ps. sorry forgot to provide the error message:
Use of uninitialized value $readJson in concatenation (.)
perl subroutine
asked Jan 4 at 15:00
Lost DemondragonLost Demondragon
287
I'm currently writing a small Perl script to act as a cronjob.
The task of the Subroutinen is to check whether the file I'm writing to is a valid json file or not and to then proceed based on the return of this subroutine and the output of another Subroutine.
Even though I do return the multiple values in a list and then assign the result of the function to the list of variables that i want define, it only seams to work with the last value from the list.
I could just encapsulated the values with an array, but i want to knowe why the method i tried is not functioning as i expected.
(sorry for the bad formatting...)
#!/usr/bin/perl
use strict;
use warnings;
use JSON;
use Data::Dumper;
sub is_valid_json {
my $readJson = do {
open(my $readJson, "+<", "../data_out.json")
or die("Can't open $filename": $!n");
local $/;
<$readJson>
};
my $json = JSON->new;
eval {
my $result = $json->decode($readJson);
my $JsonValidationStatus = 1;
return($JsonValidationStatus,$readJson );
} or do {
warn "Failed to decode_json result";
print "mission failled";
my $JsonValidationStatus = 0;
return($JsonValidationStatus, $readJson);
};
}
my ($JsonValidationStatus, $readJson) = is_valid_json();
print "One:". Dumper "$JsonValidationStatusn";
print "Two:" . Dumper "$readJsonn";
print "n n n n";
ps. sorry forgot to provide the error message:
Use of uninitialized value $readJson in concatenation (.)
perl subroutine
perl subroutine
asked Jan 4 at 15:00
Lost DemondragonLost Demondragon
287
asked Jan 4 at 15:00
Lost DemondragonLost Demondragon
287
edited Jan 4 at 15:07
Lost Demondragon
asked Jan 4 at 15:00
Lost DemondragonLost Demondragon
287
asked Jan 4 at 15:00
Lost DemondragonLost Demondragon
287
asked Jan 4 at 15:00
Lost DemondragonLost Demondragon
287
287
8
returninside anevalreturns from theeval, not the subroutine.
– Matt Jacob
Jan 4 at 15:05
now i just feel stupid... thanks anyway... should have known it better.
– Lost Demondragon
Jan 4 at 15:17
1
Irrelevant to your question, but I think you could use Data::Dumper more gracefully: print Data::Dumper->Dump([$JsonValidationStatus, $readJson], ['*One', '*Two']);
– Ed Grimm
Jan 6 at 0:27
Thankful for any help that might improve upon my code/coding style :D... Indeed i have to confess that you're way of writing is a lot more smoother and sexier. Am and Matt Jacob would you like to make you're coment the answer of this thread. I cant axept it if its just a coment, and posting the answer my self would be injust.
– Lost Demondragon
Jan 8 at 11:43
add a comment |
8
returninside anevalreturns from theeval, not the subroutine.
– Matt Jacob
Jan 4 at 15:05
now i just feel stupid... thanks anyway... should have known it better.
– Lost Demondragon
Jan 4 at 15:17
1
Irrelevant to your question, but I think you could use Data::Dumper more gracefully: print Data::Dumper->Dump([$JsonValidationStatus, $readJson], ['*One', '*Two']);
– Ed Grimm
Jan 6 at 0:27
Thankful for any help that might improve upon my code/coding style :D... Indeed i have to confess that you're way of writing is a lot more smoother and sexier. Am and Matt Jacob would you like to make you're coment the answer of this thread. I cant axept it if its just a coment, and posting the answer my self would be injust.
– Lost Demondragon
Jan 8 at 11:43
8
8
return inside an eval returns from the eval, not the subroutine.– Matt Jacob
Jan 4 at 15:05
return inside an eval returns from the eval, not the subroutine.– Matt Jacob
Jan 4 at 15:05
now i just feel stupid... thanks anyway... should have known it better.
– Lost Demondragon
Jan 4 at 15:17
now i just feel stupid... thanks anyway... should have known it better.
– Lost Demondragon
Jan 4 at 15:17
1
1
Irrelevant to your question, but I think you could use Data::Dumper more gracefully: print Data::Dumper->Dump([$JsonValidationStatus, $readJson], ['*One', '*Two']);
– Ed Grimm
Jan 6 at 0:27
Irrelevant to your question, but I think you could use Data::Dumper more gracefully: print Data::Dumper->Dump([$JsonValidationStatus, $readJson], ['*One', '*Two']);
– Ed Grimm
Jan 6 at 0:27
Thankful for any help that might improve upon my code/coding style :D... Indeed i have to confess that you're way of writing is a lot more smoother and sexier. Am and Matt Jacob would you like to make you're coment the answer of this thread. I cant axept it if its just a coment, and posting the answer my self would be injust.
– Lost Demondragon
Jan 8 at 11:43
Thankful for any help that might improve upon my code/coding style :D... Indeed i have to confess that you're way of writing is a lot more smoother and sexier. Am and Matt Jacob would you like to make you're coment the answer of this thread. I cant axept it if its just a coment, and posting the answer my self would be injust.
– Lost Demondragon
Jan 8 at 11:43
add a comment |
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8
returninside anevalreturns from theeval, not the subroutine.– Matt Jacob
Jan 4 at 15:05
now i just feel stupid... thanks anyway... should have known it better.
– Lost Demondragon
Jan 4 at 15:17
1
Irrelevant to your question, but I think you could use Data::Dumper more gracefully: print Data::Dumper->Dump([$JsonValidationStatus, $readJson], ['*One', '*Two']);
– Ed Grimm
Jan 6 at 0:27
Thankful for any help that might improve upon my code/coding style :D... Indeed i have to confess that you're way of writing is a lot more smoother and sexier. Am and Matt Jacob would you like to make you're coment the answer of this thread. I cant axept it if its just a coment, and posting the answer my self would be injust.
– Lost Demondragon
Jan 8 at 11:43