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Re: Required guidance to simplify this program

by vinoth.ree (Monsignor)
on Jun 04, 2013 at 05:52 UTC ( #1036899=note: print w/replies, xml ) Need Help??


in reply to Required guidance to simplify this program

Use grep and hash method to count the number of occurrence of elements in array as below.

use strict; use warnings; use Data::Dumper; my %count; my @array = qw(John Sue Larry Mary John Mary Larry John Joe Lisa John +Mary); grep {++$count{$_}} @array; print Dumper \%count;

All is well

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Re^2: Required guidance to simplify this program
by tobyink (Abbot) on Jun 04, 2013 at 06:35 UTC

    Using grep and map in a void context is generally discouraged. A for statement modifier is usually clearer, and almost always faster.

    use strict; use warnings; use Data::Dumper; my @array = qw(John Sue Larry Mary John Mary Larry John Joe Lisa John +Mary); my %count; $count{$_}++ for @array; print Dumper \%count;
    package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
Re^2: Required guidance to simplify this program
by Anonymous Monk on Jun 04, 2013 at 06:12 UTC

    Be that as it may, function map can also be used, but their usage i.e map and grep , like this is NOT efficient, because you are throwing away their return values.

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[Corion]: "flag problem" to me sounds like "contains UTF-8 bytes but was never properly decoded to an UTF-8 string"
[LanX]: not my code ...
[choroba]: yeah, sounds like one of the strings is not flagged as UTF-8
[choroba]: which usually means its input wasn't handled correctly
[Corion]: choroba: Yeah, I think that would be the good solution
[LanX]: I suspect the first string which comes from the DB ...
[LanX]: ... but this part is already in production for a year now
[Corion]: LanX: The "good" approach here would be to use the appropriate DBI parameters to make the driver decode strings properly. But that will have a ripple-on effect of messing up all the places where manual decoding happens ;)
[LanX]: which means albeit being broken UTF8 it'll be handled correctly
[LanX]: and the problem only occurs since we changed the emails to base64

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